How do frogs primarily capture their prey?

Correct Option: B. Solution: Frogs use their bilobed tongue to capture prey.

Structural Organisation in Animals

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Summary

Structural Organisation in Animals

Summary

Multicellular animals have cells organized into tissues, organs, and organ systems.
Four basic types of tissues: epithelial, connective, muscular, and neural.
Tissues perform specific functions, contributing to the organism's survival.
Organs are formed from tissues and work together in organ systems (e.g., digestive system).
Frogs (Rana tigrina) are amphibians with adaptations for both land and water.
Frogs have a closed circulatory system and a well-developed excretory system.
Reproductive processes in frogs include external fertilization and development through a larval stage (tadpole).
Frogs play a crucial role in the ecosystem by controlling insect populations and serving as food sources.

Key Features of Frogs

Morphology: Body divided into head and trunk; smooth, moist skin; bulging eyes; webbed limbs for swimming.
Anatomy: Includes digestive, circulatory, respiratory, nervous, excretory, and reproductive systems.
Respiration: Cutaneous respiration in water; pulmonary respiration on land.
Excretion: Ureotelic, excreting urea through kidneys into cloaca.
Reproductive System: Males have testes and vocal sacs; females have ovaries and oviducts.

Learning Objectives

Understand the concept of organ and organ systems in multicellular organisms.
Identify the four basic types of tissues in complex animals.
Describe the morphology and anatomy of frogs as representatives of vertebrates.
Explain the physiological adaptations of frogs for living in both aquatic and terrestrial environments.
Analyze the structure and function of the digestive, circulatory, respiratory, nervous, excretory, and reproductive systems in frogs.
Recognize the significance of frogs in ecological balance and their role in the food chain.

Detailed Notes

Structural Organisation in Animals

7.1 Organ and Organ System

Definition of Tissue: A group of similar cells along with intercellular substances performing a specific function.
Types of Tissues: Four basic types of tissues in complex animals.
Organ Formation: Organs are formed by the organization of tissues.
Organ Systems: Two or more organs working together form an organ system (e.g., digestive system).

7.2 Frogs

Class: Amphibia, Phylum Chordata.
Common Species: Rana tigrina.
Body Temperature: Cold-blooded (poikilotherms).
Camouflage: Ability to change color for protection.
Hibernation and Aestivation: Summer sleep (aestivation) and winter sleep (hibernation).

7.2.1 Morphology

Skin: Smooth, slippery, and moist due to mucus.
Body Structure: Divided into head and trunk; no neck or tail.
Eyes: Bulged, covered by a nictitating membrane.
Limbs: Forelimbs and hind limbs assist in movement.

7.2.2 Anatomy

Digestive System: Short alimentary canal; includes mouth, oesophagus, stomach, intestine, rectum, and cloaca.
Respiratory System: Skin (cutaneous respiration) and lungs (pulmonary respiration).
Circulatory System: Closed system with a three-chambered heart.
Excretory System: Composed of kidneys, ureters, cloaca, and urinary bladder.
Reproductive System: Male (testes) and female (ovaries) reproductive organs; external fertilization.

Important Diagrams

Figure 7.1: External Features of Frog

Head: Front part of the frog.
Eye: Located near the top of the head.
Trunk: Main body section.
Fore limb: Front leg.
Hind limb: Rear leg.

Figure 7.2: Internal Organs of Frog

Heart: Central top, red.
Oesophagus: Behind the liver.
Liver: Large, brown, lobed.
Gall bladder: Green, under the liver.
Lung: Small, pink, beside the liver.
Stomach: Pink, elongated, on the right side.
Kidney: Red, elongated, centrally located.
Cloaca: Posterior end for waste exit.

Figure 7.3: Male Reproductive System

Testis: Yellowish ovoid structures.
Vasa efferentia: Connect testes to kidneys.
Cloaca: Chamber for excretory and reproductive tracts.

Figure 7.4: Female Reproductive System

Ovary: Produces ova.
Oviduct: Transports ova to cloaca.

Exam Tips & Common Mistakes

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Tissue Types: Students often confuse the four basic types of tissues in animals. Remember that epithelial, connective, muscular, and neural tissues each have distinct functions and characteristics.
Confusing Morphology and Anatomy: Morphology refers to the external features of organisms, while anatomy deals with the internal structures. Ensure you can differentiate between the two.
Overlooking Frog Adaptations: Frogs have unique adaptations like camouflage and the ability to absorb water through their skin. Failing to mention these can lead to incomplete answers.
Ignoring the Role of the Cloaca: The cloaca serves multiple functions (excretion and reproduction) in frogs. Not explaining its significance can lead to misunderstandings about frog anatomy.

Exam Tips

Draw Diagrams: Practice drawing and labeling diagrams of frog anatomy, such as the digestive and reproductive systems. Visual aids can help reinforce your understanding.
Use Terminology Correctly: Be precise with biological terms. For example, use 'aestivation' for summer sleep and 'hibernation' for winter sleep.
Understand Life Cycles: Be familiar with the life cycle of frogs, including the tadpole stage and metamorphosis, as this is often a focus in exam questions.
Review Functions of Organ Systems: Make sure you can explain the functions of various organ systems in frogs, such as the circulatory, respiratory, and excretory systems, as these are commonly tested topics.

Practice & Assessment

Multiple Choice Questions

It is dry and scaly.

It is smooth and slippery due to mucus.

It is covered with feathers.

It is hard and bony.

Correct Answer: B

Solution:

The frog's skin is smooth and slippery due to the presence of mucus, which helps in respiration and maintaining moisture.

Pulmonary respiration

Cutaneous respiration

Buccal respiration

Tracheal respiration

Correct Answer: B

Solution:

Frogs use cutaneous respiration to exchange gases through their skin when submerged in water.

Through gills

Through lungs

Through skin only

Through cloaca

Correct Answer: B

Solution:

On land, frogs primarily use their lungs for respiration, although they can also respire through their skin and buccal cavity.

Internal fertilization and direct development

External fertilization and metamorphosis

Internal fertilization and metamorphosis

External fertilization and direct development

Correct Answer: B

Solution:

Frogs undergo external fertilization and their development involves a larval stage called tadpole, which metamorphoses into an adult.

Nictitating membrane

Tympanum

Olfactory lobes

Cerebellum

Correct Answer: B

Solution:

The tympanum in frogs is a membranous structure located on either side of the eyes that receives sound signals, functioning as an ear.

It has four chambers

It is located in the lower part of the body cavity

It is covered by a membrane called pericardium

It has a sinus venosus that joins the left atrium

Correct Answer: C

Solution:

The frog's heart is covered by a membrane called the pericardium.

To aid in digestion

To enhance hearing

To protect the eyes underwater

To assist in reproduction

Correct Answer: C

Solution:

The nictitating membrane in frogs is a protective layer that covers the eyes, helping to protect them while the frog is underwater.

Digestive system

Respiratory system

Excretory system

Nervous system

Correct Answer: C

Solution:

The excretory system in frogs, which includes kidneys, ureters, cloaca, and urinary bladder, is responsible for eliminating nitrogenous wastes.

Frogs can regulate their body temperature internally.

Frogs maintain a constant body temperature regardless of the environment.

Frogs' body temperature varies with the environmental temperature.

Frogs are warm-blooded animals.

Correct Answer: C

Solution:

Poikilotherms are organisms whose body temperature varies with the temperature of their environment, which is characteristic of frogs.

Frogs have a closed circulatory system with a three-chambered heart.

Frogs have an open circulatory system with a four-chambered heart.

Frogs have a closed circulatory system with a two-chambered heart.

Frogs have an open circulatory system with a three-chambered heart.

Correct Answer: A

Solution:

Frogs have a closed circulatory system with a heart that consists of three chambers: two atria and one ventricle.

Open circulatory system

Closed circulatory system

No circulatory system

Partially open circulatory system

Correct Answer: B

Solution:

Frogs have a well-developed closed circulatory system.

White blood cells

Red blood cells

Platelets

Lymphocytes

Correct Answer: B

Solution:

Red blood cells (RBCs) in frogs contain the pigment haemoglobin, which is responsible for carrying oxygen.

To produce bile

To secrete insulin

To produce digestive enzymes

To store vitamins

Correct Answer: C

Solution:

The pancreas in frogs produces pancreatic juices that contain digestive enzymes necessary for the digestion of carbohydrates and proteins.

Secretion of digestive enzymes

Absorption of digested food

Production of bile

Storage of waste

Correct Answer: B

Solution:

The villi in the intestine are responsible for the absorption of digested food.

It only helps in respiration on land

It only helps in respiration in water

It helps in respiration both on land and in water

It does not play a role in respiration

Correct Answer: C

Solution:

The frog's skin helps in respiration both on land and in water.

Enhanced vision

Improved camouflage

Facilitated cutaneous respiration

Increased reproductive success

Correct Answer: C

Solution:

The moist skin of frogs facilitates cutaneous respiration, allowing them to exchange gases directly through their skin, which is crucial for their survival in both aquatic and terrestrial environments.

To store bile

To pass faecal matter, urine, and sperms to the exterior

To absorb nutrients

To produce digestive enzymes

Correct Answer: B

Solution:

The cloaca is a chamber that passes faecal matter, urine, and sperms to the exterior in frogs.

Ureter

Cloaca

Kidney

Testes

Correct Answer: B

Solution:

In male frogs, the cloaca is a common chamber that serves as the exit point for the digestive, excretory, and reproductive systems, thus playing a role in both excretion and reproduction.

It has four chambers.

It is located in the lower part of the body cavity.

It has three chambers: two atria and one ventricle.

It only circulates blood to the lungs.

Correct Answer: C

Solution:

The frog's heart has three chambers, consisting of two atria and one ventricle, and is located in the upper part of the body cavity.

Secretes bile

Produces digestive enzymes

Stores bile

Filters blood

Correct Answer: B

Solution:

The pancreas in frogs produces pancreatic juice containing digestive enzymes.

Nervous system

Endocrine system

Digestive system

Respiratory system

Correct Answer: B

Solution:

The endocrine system in frogs is responsible for the secretion of hormones, which coordinate various physiological processes in the body.

Open circulatory system with a single chambered heart

Closed circulatory system with a three-chambered heart

Open circulatory system with a three-chambered heart

Closed circulatory system with a four-chambered heart

Correct Answer: B

Solution:

Frogs have a closed circulatory system with a three-chambered heart, consisting of two atria and one ventricle.

Frogs use gills for respiration throughout their life.

Frogs can only respire through their lungs.

Frogs use their skin, buccal cavity, and lungs for respiration.

Frogs respire through their skin only during hibernation.

Correct Answer: C

Solution:

Frogs respire through their skin (cutaneous respiration), buccal cavity, and lungs (pulmonary respiration). During aestivation and hibernation, cutaneous respiration is predominant.

Using their sharp teeth

With their bilobed tongue

By using their claws

By trapping them in webs

Correct Answer: B

Solution:

Frogs use their bilobed tongue to capture prey.

Frogs only use lungs for respiration.

Frogs respire through skin, lungs, and buccal cavity.

Frogs have gills for respiration throughout their life.

Frogs rely solely on cutaneous respiration on land.

Correct Answer: B

Solution:

Frogs respire through the skin (cutaneous respiration), lungs (pulmonary respiration), and buccal cavity. This allows them to adapt to both aquatic and terrestrial environments.

Epithelial

Muscular

Connective

All of the above

Correct Answer: D

Solution:

Complex animals consist of four basic types of tissues: epithelial, connective, muscular, and neural.

The alimentary canal is long due to their herbivorous diet.

The liver secretes digestive enzymes directly into the stomach.

The pancreas secretes pancreatic juice into the duodenum.

The cloaca is primarily involved in digestion.

Correct Answer: C

Solution:

In frogs, the pancreas secretes pancreatic juice into the duodenum, where it aids in the digestion of carbohydrates and proteins.

Frogs remain active during the summer

Frogs enter a state of dormancy during the summer

Frogs migrate to cooler areas during the summer

Frogs increase their metabolic rate during the summer

Correct Answer: B

Solution:

Aestivation is a process where frogs enter a state of dormancy during the summer to avoid extreme heat.

By drinking through their mouths

Through their skin

Through their lungs

Through their digestive tract

Correct Answer: B

Solution:

Frogs do not drink water but absorb it through their skin.

It is a chamber for passing faecal matter, urine, and sperms to the exterior.

It is a storage organ for bile.

It is a gland that secretes digestive enzymes.

It is a structure for gas exchange.

Correct Answer: A

Solution:

The cloaca is a small, median chamber used to pass faecal matter, urine, and sperms to the exterior.

Frogs respire only through their lungs.

Frogs use their skin, buccal cavity, and lungs for respiration.

Frogs respire through gills throughout their life.

Frogs only use their skin for respiration during aestivation.

Correct Answer: B

Solution:

Frogs respire on land using their buccal cavity, skin, and lungs, while in water, they primarily use their skin for respiration.

Respiration

Excretion

Digestion

Reproduction

Correct Answer: B

Solution:

The cloaca in frogs is a chamber that passes fecal matter, urine, and sperms to the exterior, playing a key role in excretion.

Respiratory system

Digestive system

Circulatory system

Excretory system

Correct Answer: C

Solution:

The circulatory system in frogs, which includes the heart, blood vessels, and blood, is responsible for transporting nutrients, gases, and water throughout the body.

Digestive system

Respiratory system

Circulatory system

Nervous system

Correct Answer: B

Solution:

The respiratory system in frogs is responsible for cutaneous respiration, where the skin acts as an aquatic respiratory organ, allowing the exchange of gases through diffusion in water.

Pituitary gland

Adrenal gland

Thyroid gland

Pineal body

Correct Answer: C

Solution:

The thyroid gland in frogs secretes hormones that regulate metabolism and growth, similar to its function in other vertebrates.

Secreting digestive enzymes

Lining body surfaces and cavities

Providing structural support

Facilitating absorption

Correct Answer: C

Solution:

Epithelial tissue lines body surfaces and cavities, facilitates absorption, and secretes substances, but it does not provide structural support, which is a function of connective tissue.

Respiratory system using lungs

Cutaneous respiration through the skin

Buccal cavity respiration

Respiratory system using gills

Correct Answer: B

Solution:

Frogs respire in water through their skin, a process known as cutaneous respiration, which allows dissolved oxygen in the water to be exchanged through the skin by diffusion.

To pump oxygenated blood to the body

To receive deoxygenated blood from the body

To filter blood

To store blood

Correct Answer: B

Solution:

The sinus venosus in frogs receives deoxygenated blood from the body through major veins and channels it into the right atrium.

By releasing toxic chemicals

By changing color to blend with the environment

By burrowing underground

By emitting loud sounds

Correct Answer: B

Solution:

Frogs can change their color to blend with their surroundings, a form of mimicry that helps them hide from predators.

On land, under moist conditions

In water

Inside the female's body

In the cloaca

Correct Answer: B

Solution:

Frogs undergo external fertilization, which takes place in water, where the eggs and sperm are released.

Metamorphosis

Aestivation

Mimicry

Hibernation

Correct Answer: C

Solution:

Mimicry is the term used to describe the ability of frogs to change their skin color to camouflage and protect themselves from predators.

It is used solely for respiration.

It serves as a storage organ for food.

It is a chamber for the passage of digestive, excretory, and reproductive materials.

It functions as the primary organ for blood circulation.

Correct Answer: C

Solution:

The cloaca in frogs is a common chamber into which the digestive, excretory, and reproductive systems open, allowing passage of materials to the exterior.

Digestive system

Nervous system

Endocrine system

Respiratory system

Correct Answer: C

Solution:

The endocrine system in frogs is responsible for the chemical coordination of various organs through the secretion of hormones by endocrine glands.

Camouflage

Aestivation and hibernation

Cutaneous respiration

Mimicry

Correct Answer: B

Solution:

Frogs undergo aestivation during summer and hibernation during winter to survive extreme temperatures.

Epithelial tissue

Connective tissue

Muscular tissue

Nervous tissue

Correct Answer: A

Solution:

Epithelial tissue, specifically the villi and microvilli in the intestine, increases the surface area for absorption of nutrients.

To store bile

To absorb nutrients

To excrete nitrogenous wastes

To produce digestive enzymes

Correct Answer: C

Solution:

In frogs, the cloaca is a chamber that serves as the exit point for excretory products, including nitrogenous wastes, as well as reproductive materials.

Pulmonary respiration

Buccal respiration

Cutaneous respiration

Tracheal respiration

Correct Answer: C

Solution:

In water, frogs primarily respire through their skin, which is known as cutaneous respiration.

Heart and lungs

Liver and intestine

Kidney and bladder

Brain and spinal cord

Correct Answer: B

Solution:

The hepatic portal system in frogs is a special venous connection between the liver and intestine, allowing nutrient-rich blood from the intestine to be processed by the liver.

Connective tissue

Muscular tissue

Epithelial tissue

Nervous tissue

Correct Answer: C

Solution:

Epithelial tissue is responsible for lining the cavities and surfaces of organs in frogs, providing a protective barrier and facilitating absorption and secretion.

Transport of oxygen to tissues

Absorption of nutrients from the intestine

Collection and transport of lymph

Production of digestive enzymes

Correct Answer: C

Solution:

The lymphatic system in frogs collects and transports lymph, which is a fluid that lacks proteins and RBCs, playing a role in immune function and fluid balance.

Transport oxygen to cells

Transport nutrients to cells

Remove waste products from tissues

Store and release bile

Correct Answer: C

Solution:

The lymphatic system in frogs is responsible for removing waste products from tissues.

Through lungs

Through gills

Through skin

Through buccal cavity

Correct Answer: C

Solution:

Frogs primarily respire through their skin when they are in water.

To aid in digestion

To assist in respiration

To provide camouflage

To help in reproduction

Correct Answer: B

Solution:

The mucous glands in the skin of frogs help keep the skin moist, which is essential for cutaneous respiration.

Protection against predators

Respiration

Storage of nutrients

Excretion of waste

Correct Answer: B

Solution:

The frog's skin is highly vascularised and aids in respiration both in water and on land.

Transport oxygen

Transport nutrients

Transport lymph

Transport carbon dioxide

Correct Answer: C

Solution:

The lymphatic system in frogs transports lymph, which is different from blood and lacks RBCs.

It serves as a storage organ for bile.

It is involved in the excretion of urea only.

It is a common chamber for the passage of fecal matter, urine, and reproductive cells.

It is a specialized organ for respiration.

Correct Answer: C

Solution:

The cloaca in frogs is a common chamber that serves as a passage for fecal matter, urine, and reproductive cells to the exterior.

Passing faecal matter

Exchanging gases

Passing urine

Passing sperms

Correct Answer: B

Solution:

The cloaca in frogs is used for passing faecal matter, urine, and sperms, but not for gas exchange.

It is a cold-blooded animal.

It has a constant body temperature.

It can change color for camouflage.

It undergoes aestivation and hibernation.

Correct Answer: B

Solution:

The Indian bullfrog, Rana tigrina, is a cold-blooded animal, meaning its body temperature varies with the environment. It can change color for camouflage and undergoes aestivation and hibernation, but it does not have a constant body temperature.

Internal fertilization

Presence of a cloaca

Direct development without larval stage

Live birth

Correct Answer: B

Solution:

Frogs have a cloaca, a common chamber for the passage of fecal matter, urine, and reproductive cells, which is not present in mammals.

Pancreas

Liver

Gall bladder

Kidney

Correct Answer: C

Solution:

The gall bladder stores bile, which is secreted by the liver and aids in the digestion of fats.

Transport oxygen directly to tissues.

Produce digestive enzymes.

Transport lymph and assist in immune function.

Store excess nutrients.

Correct Answer: C

Solution:

The lymphatic system in frogs transports lymph, which is involved in immune function and helps in maintaining fluid balance in the body.

Tissues are groups of similar cells that perform a specific function.

Tissues are individual cells that perform all functions independently.

Tissues are the primary site for nutrient storage in animals.

Tissues are responsible for the production of hormones in animals.

Correct Answer: A

Solution:

Tissues in multicellular organisms are groups of similar cells along with intercellular substances that perform a specific function, contributing to the division of labor within the organism.

Respiratory system

Circulatory system

Digestive system

Excretory system

Correct Answer: C

Solution:

The digestive system is responsible for the absorption of nutrients. After digestion, nutrients are absorbed in the intestine, specifically through structures called villi and microvilli.

True or False

Correct Answer: False

Solution:

Frogs have a closed circulatory system, but they exhibit single circulation, not double.

Correct Answer: True

Solution:

The excretory system of frogs consists of kidneys, ureters, cloaca, and a urinary bladder, which are involved in the elimination of nitrogenous wastes.

Correct Answer: False

Solution:

The cloaca in frogs is a chamber used to pass faecal matter, urine, and sperms to the exterior.

Correct Answer: True

Solution:

Frogs respire in water through their skin (cutaneous respiration) and on land through their buccal cavity and lungs (pulmonary respiration).

Correct Answer: True

Solution:

Frogs are ureotelic animals, meaning they excrete urea as their primary nitrogenous waste. This is carried by blood into the kidneys where it is separated and excreted.

Correct Answer: False

Solution:

Frogs can respire through their skin, buccal cavity, and lungs. In water, they use cutaneous respiration through the skin, and on land, they use pulmonary respiration through the lungs.

Correct Answer: False

Solution:

The heart of a frog has three chambers: two atria and one ventricle.

Correct Answer: True

Solution:

Frogs can respire in water through their skin (cutaneous respiration) and on land through their buccal cavity, skin, and lungs (pulmonary respiration).

Correct Answer: False

Solution:

The skin of a frog is smooth and slippery due to the presence of mucus glands, which keep it moist.

Correct Answer: True

Solution:

Frogs do not have a constant body temperature, meaning their body temperature varies with the temperature of the environment. Such animals are called cold-blooded or poikilotherms.

Correct Answer: True

Solution:

Rana tigrina, also known as the Indian bullfrog, is indeed a common species found in India.

Correct Answer: True

Solution:

Frogs have the ability to change color to hide from enemies, a protective coloration known as mimicry.

Correct Answer: True

Solution:

Frogs have a well-developed closed circulatory system, which includes a heart, blood vessels, and blood.

Correct Answer: False

Solution:

Frogs are cold-blooded animals, meaning their body temperature varies with the temperature of the environment.

Correct Answer: True

Solution:

Frogs can respire through their skin in water (cutaneous respiration) and also use their skin as a respiratory organ on land.

Correct Answer: True

Solution:

The Indian bullfrog, Rana tigrina, is the common frog found in India. It can change color to hide from enemies, a form of protective coloration known as mimicry.

Correct Answer: False

Solution:

Frogs do not have a constant body temperature. Their body temperature varies with the temperature of the environment, making them cold-blooded or poikilotherms.

Correct Answer: False

Solution:

The circulatory system of frogs is a well-developed closed type, and they also have a lymphatic system.

Correct Answer: True

Solution:

Frogs lack an external ear structure; instead, they have a tympanum that serves as the organ for hearing.

Correct Answer: False

Solution:

The skin of a frog is smooth and slippery due to the presence of mucus.

Correct Answer: True

Solution:

In multicellular organisms, tissues organize to form organs, and these organs associate to form organ systems, allowing for efficient and coordinated activities.

Correct Answer: False

Solution:

The cloaca is a small, median chamber in frogs that is used to pass faecal matter, urine, and sperms to the exterior.

Correct Answer: True

Solution:

Frogs are poikilotherms, or cold-blooded animals, which means their body temperature changes with the temperature of their surroundings.

Correct Answer: False

Solution:

Frogs have a closed circulatory system, but it is characterized by single circulation, not double.

Correct Answer: True

Solution:

In multicellular animals, a group of similar cells along with intercellular substances perform a specific function, forming tissues. These tissues organize to form organs, which in turn associate to form organ systems.

Correct Answer: True

Solution:

Frogs possess a closed circulatory system that includes a heart with three chambers: two atria and one ventricle.

Correct Answer: False

Solution:

Frogs are poikilothermic, meaning their body temperature varies with the temperature of the environment, not constant.

Correct Answer: True

Solution:

Fertilization in frogs is external, occurring in water, and the development involves a larval stage known as a tadpole.

Correct Answer: False

Solution:

Frogs do not have a constant body temperature; their body temperature varies with the temperature of the environment, making them cold-blooded or poikilotherms.

Correct Answer: True

Solution:

Fertilization in frogs is external and takes place in water. Development involves a larval stage called tadpole, which undergoes metamorphosis to form the adult frog.

Correct Answer: True

Solution:

On land, frogs use their lungs for pulmonary respiration. The lungs are a pair of elongated, pink-colored sac-like structures present in the upper part of the trunk region.

Correct Answer: False

Solution:

The male reproductive system of frogs includes a pair of testes, not ovaries.

Correct Answer: False

Solution:

Frogs are cold-blooded or poikilotherms, meaning their body temperature varies with the temperature of the environment.

Correct Answer: True

Solution:

Frogs exhibit sexual dimorphism. Male frogs can be distinguished by the presence of sound-producing vocal sacs and a copulatory pad on the first digit of the forelimbs, which are absent in female frogs.

Correct Answer: True

Solution:

The skin of frogs is highly vascularized and helps in respiration in water through cutaneous respiration and on land in conjunction with lungs and buccal cavity.

Correct Answer: False

Solution:

The heart of a frog has three chambers: two atria and one ventricle, unlike mammals which have four-chambered hearts.

Correct Answer: True

Solution:

The heart of a frog consists of three chambers: two atria and one ventricle.

Correct Answer: True

Solution:

Structural Organisation in Animals

AI Learning Assistant

Summary

Structural Organisation in Animals

Summary

Key Features of Frogs

Learning Objectives

Learning Objectives

Detailed Notes

Structural Organisation in Animals

7.1 Organ and Organ System

7.2 Frogs

7.2.1 Morphology

7.2.2 Anatomy

Important Diagrams

Figure 7.1: External Features of Frog

Figure 7.2: Internal Organs of Frog

Figure 7.3: Male Reproductive System

Figure 7.4: Female Reproductive System

Exam Tips & Common Mistakes

Common Mistakes and Exam Tips

Common Pitfalls

Exam Tips

Practice & Assessment

Multiple Choice Questions

Q1.Which of the following is a characteristic of the frog's skin?

Correct Answer: B

Q2.Which respiratory method is used by frogs to exchange gases while they are submerged in water?

Correct Answer: B

Q3.How do frogs primarily respire when they are on land?

Correct Answer: B

Q4.Which of the following best describes the reproductive strategy of frogs?

Correct Answer: B

Q5.In frogs, which structure is responsible for receiving sound signals?

Correct Answer: B

Q6.Which of the following is a characteristic of the frog's heart?

Correct Answer: C

Q7.What is the primary function of the nictitating membrane in frogs?

Correct Answer: C

Q8.Which system in frogs is responsible for the elimination of nitrogenous wastes?

Correct Answer: C

Q9.Which of the following statements best explains why frogs are considered poikilotherms?

Correct Answer: C

Q10.Which of the following statements about the circulatory system of frogs is correct?

Correct Answer: A

Q11.Which of the following is a characteristic of the circulatory system in frogs?

Correct Answer: B

Q12.What type of blood cells in frogs contain the pigment haemoglobin?

Correct Answer: B

Q13.What is the function of the pancreas in the digestive system of frogs?

Correct Answer: C

Q14.What is the primary function of the villi in the intestine of a frog?

Correct Answer: B

Q15.What is the role of the frog's skin in respiration?

Correct Answer: C

Q16.What evolutionary advantage do frogs gain by having a moist skin?

Correct Answer: C

Q17.In the anatomy of a frog, what is the primary function of the cloaca?

Correct Answer: B

Q18.In the anatomy of a frog, which organ is responsible for both excretion and reproductive functions in males?

Correct Answer: B

Q19.Which of the following is a characteristic feature of the frog's heart?

Correct Answer: C

Q20.In frogs, what is the function of the pancreas?

Correct Answer: B

Q21.In frogs, which of the following systems is primarily responsible for the coordination of chemical signals in the body?

Correct Answer: B

Q22.Which of the following is a characteristic feature of the circulatory system in frogs?

Correct Answer: B

Q23.Which of the following statements about the respiratory system of frogs is correct?

Correct Answer: C

Q24.How do frogs primarily capture their prey?

Correct Answer: B

Q25.Which of the following is a characteristic feature of the frog's respiratory system?

Correct Answer: B

Q26.Which of the following is a basic type of tissue found in complex animals?

Correct Answer: D

Q27.Which of the following is true about the digestive system of frogs?

Correct Answer: C

Q28.Which of the following describes the process of aestivation in frogs?