Which part of the flower develops into seeds after fertilization?

Correct Option: B. Solution: After fertilization, ovules develop into seeds.

Sexual Reproduction in Flowering Plants

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Summary

Summary of Sexual Reproduction in Flowering Plants

Biology Overview: Biology is the story of life on Earth; reproduction is vital for species survival.
Reproductive Processes:
- Asexual and sexual reproduction are the two modes through which individuals leave progeny.
- Sexual reproduction creates new variants, enhancing survival advantages.
Chapters Overview:
- Chapter 1: Focuses on sexual reproduction in flowering plants (angiosperms).
- Chapter 2: Discusses human reproduction.
- Chapter 3: Covers reproductive health and avoidance of reproductive ill health.
Flower Structure: Flowers are essential for sexual reproduction, showcasing diverse structures and adaptations.
Pollination: Involves transferring pollen from anther to stigma, facilitated by abiotic (wind, water) and biotic (animals) agents.
Double Fertilization: Unique to angiosperms, involving syngamy and triple fusion, leading to zygote and endosperm formation.
Embryo Development: Embryos undergo several stages before maturation; differences exist between dicotyledonous and monocotyledonous embryos.
Apomixis and Polyembryony: Some angiosperms can form seeds without fertilization (apomixis) and produce multiple embryos (polyembryony).
Importance of Seeds: Seeds provide advantages for reproduction and dispersal, independent of water.

Learning Objectives

Understand the significance of sexual reproduction in flowering plants.
Describe the structure and function of flowers as reproductive organs.
Explain the processes involved in pre-fertilisation, fertilisation, and post-fertilisation in angiosperms.
Identify the various adaptations of flowers that facilitate sexual reproduction.
Discuss the concept of apomixis and its importance in plant reproduction.
Differentiate between various types of fruits and their development processes.

Detailed Notes

Chapter Notes on Reproduction in Plants and Humans

Overview of Reproduction

Biology: The story of life on earth; individual organisms die, but species continue through reproduction.
Reproduction: Vital for species survival; can be asexual or sexual.
Sexual Reproduction: Creates new variants, enhancing survival advantages.

Chapter Breakdown

Chapter 1: Sexual Reproduction in Flowering Plants

Importance of Flowers: Essential for sexual reproduction; diverse structures aid in reproduction.
Key Concepts:
- Chasmogamous Flowers: Open flowers allowing cross-pollination.
- Cleistogamous Flowers: Closed flowers that self-pollinate; cross-pollination is not possible.
- Self-Incompatibility: Mechanism preventing self-fertilization in certain species.
- Bagging Technique: Used in plant breeding to control pollination.
- Triple Fusion: Involves the fusion of three nuclei during fertilization.
- Apomixis: Formation of seeds without fertilization, beneficial in agriculture.
- Polyembryony: Production of multiple embryos in a single seed.

Chapter 2: Human Reproduction

Overview: Discusses human reproductive health and prevention of reproductive ill health.

Chapter 3: Reproductive Health

Focus: Understanding reproductive processes and health in humans.

Key Terms and Definitions

Zygote: The fertilized ovule that develops into an embryo.
Endosperm: Tissue that provides nourishment to the developing embryo.
Pericarp: The wall of the fruit, develops from the ovary.
False Fruit: Fruits that develop from parts other than the ovary (e.g., apple, strawberry).

Important Processes

Pollination: Transfer of pollen from anther to stigma, can be abiotic (wind, water) or biotic (animals).
Double Fertilization: Occurs in angiosperms, involving two fusion events leading to a zygote and endosperm.
Seed Development: Seeds form from fertilized ovules; consist of seed coat, cotyledons, and embryo axis.

Conclusion

Understanding reproduction in flowering plants and humans is crucial for biology, agriculture, and health.

Exam Tips & Common Mistakes

Common Mistakes and Exam Tips

Common Pitfalls

Misunderstanding Pollination Types: Students often confuse autogamy (self-pollination) with cross-pollination. Ensure clarity on the definitions and examples of each type.
Confusing Structures: Differentiating between similar structures such as hypocotyl and epicotyl can be challenging. Pay attention to their definitions and functions.
Overlooking the Importance of Endosperm: Many students forget to discuss the role of endosperm in seed development. Remember that it provides nutrition to the developing embryo.
Ignoring the Role of Tapetum: The function of tapetum in pollen grain wall formation is often overlooked. Understand its significance in the development of male gametophytes.

Exam Tips

Review Key Terms: Make flashcards for terms like chasmogamous, cleistogamous, self-incompatibility, and apomixis to reinforce your understanding.
Practice Diagrams: Be able to label diagrams of flowers, seeds, and the embryo sac. Visual aids can help solidify your understanding of complex structures.
Understand Processes: Focus on processes like double fertilization and the stages of embryo development. Be prepared to explain these processes in detail.
Use Examples: When answering questions, use specific examples of plants to illustrate your points, especially when discussing concepts like parthenocarpy or false fruits.

Practice & Assessment

Multiple Choice Questions

It ensures seed dispersal over a wider geographic area.

It reduces seed predation by other animals.

It enhances seed germination by exposing seeds to digestive enzymes.

It allows seeds to remain dormant for extended periods.

Correct Answer: A

Solution:

The passage through the animal's digestive system aids in seed dispersal over a wider geographic area, increasing the likelihood of the seeds finding suitable conditions for germination.

To protect the pollen grains

To provide nutrition for pollen development

To facilitate pollination

To form the pollen tube

Correct Answer: B

Solution:

The tapetum provides nutrition for the development of pollen grains, which is crucial for their formation.

Immediate germination in all conditions

Protection from herbivores

Survival through unfavorable conditions

Increased seed size

Correct Answer: C

Solution:

Seed dormancy allows seeds to survive through unfavorable conditions and germinate only when conditions are optimal, thus enhancing the plant's chances of survival.

Apomixis

Polyembryony

Parthenocarpy

Self-incompatibility

Correct Answer: A

Solution:

Apomixis is a form of asexual reproduction that mimics sexual reproduction, where seeds are produced without fertilization, resulting in offspring genetically identical to the parent.

Stigma

Ovary

Embryo sac

Anther

Correct Answer: C

Solution:

Double fertilization occurs in the embryo sac, where one male gamete fuses with the egg cell and the other with the polar nuclei.

Stigma

Ovules

Petals

Sepals

Correct Answer: B

Solution:

After fertilization, ovules develop into seeds.

To protect the seed from external damage

To provide nutrition to the developing embryo

To facilitate seed dispersal

To store genetic information

Correct Answer: B

Solution:

The endosperm provides nutrition to the developing embryo, which is crucial for its growth.

It prevents cross-pollination by external agents.

It enhances the growth rate of plants.

It increases the number of seeds produced.

It helps in the artificial selection of desirable traits.

Correct Answer: A

Solution:

The bagging technique is used to prevent unwanted cross-pollination by external agents, ensuring that only the desired pollen fertilizes the flowers.

Self-pollination

Cross-pollination

Apomixis

Cleistogamy

Correct Answer: B

Solution:

Cross-pollination introduces genetic variation, which can lead to new traits such as increased drought resistance in hybrid crops.

Syngamy

Triple fusion

Double fertilisation

Apomixis

Correct Answer: C

Solution:

Double fertilisation is unique to flowering plants and involves syngamy and triple fusion.

Formation of two zygotes

Fusion of two male gametes with one egg cell

Formation of a diploid zygote and a triploid endosperm

Fusion of three male gametes with two egg cells

Correct Answer: C

Solution:

Double fertilization results in the formation of a diploid zygote and a triploid endosperm.

A type of sexual reproduction

Seed formation without fertilisation

A method of cross-pollination

A technique for plant breeding

Correct Answer: B

Solution:

Apomixis is a form of asexual reproduction that results in seed formation without fertilisation.

Endosperm; Polyembryony

Ovule; Apomixis

Ovary; Parthenocarpy

Embryo sac; Double fertilization

Correct Answer: B

Solution:

Apomixis is a process where seeds are formed without fertilization, and it occurs in the ovule.

Seeds that germinate immediately after dispersal, ensuring rapid colonization.

Seeds that remain dormant until environmental conditions are favorable, ensuring survival during adverse conditions.

Seeds that require a specific animal for dispersal, ensuring targeted colonization.

Seeds that rely on wind for dispersal, ensuring widespread distribution.

Correct Answer: B

Solution:

Seed dormancy allows seeds to withstand unfavorable conditions and germinate only when conditions are optimal, increasing the chances of survival and successful reproduction.

Bagging

Emasculation

Grafting

Layering

Correct Answer: B

Solution:

Emasculation involves removing the male parts of a flower to prevent self-pollination, allowing controlled cross-pollination studies.

Apomixis, as it allows for the production of genetically identical seeds without fertilization.

Cross-pollination, as it increases genetic diversity and potential drought resistance.

Self-pollination, as it ensures seed production even in the absence of pollinators.

Cleistogamy, as it prevents cross-pollination and maintains genetic purity.

Correct Answer: B

Solution:

Cross-pollination increases genetic diversity, which can lead to the emergence of drought-resistant traits, enhancing the crop's ability to survive prolonged drought conditions.

Stigma

Ovary

Anther

Petal

Correct Answer: B

Solution:

After fertilization, the ovary develops into a fruit.

To produce flowers for aesthetic purposes

To ensure the formation of fruits and seeds

To provide food for pollinators

To enhance the plant's height

Correct Answer: B

Solution:

Sexual reproduction in flowering plants ensures the formation of fruits and seeds, which are the end products of this process.

Producing hybrid seeds without the need for controlled pollination.

Enhancing genetic diversity through cross-pollination.

Increasing seed viability through genetic modification.

Facilitating seed dispersal via biotic agents.

Correct Answer: A

Solution:

Apomixis allows for the production of seeds without fertilization, maintaining the genetic makeup of the parent plant, which is beneficial for producing uniform and consistent crops.

To allow the seed coat to harden

To ensure endosperm development precedes embryo development

To prevent premature germination

To synchronize with fruit development

Correct Answer: B

Solution:

The zygote remains dormant to ensure that endosperm development, which provides nutrition, precedes embryo development.

Stigma

Anther

Ovary

Sepal

Correct Answer: B

Solution:

The anther is the part of the stamen that produces pollen grains.

It produces genetically identical seeds without fertilization, ensuring uniformity.

It allows for rapid growth of plants by skipping the seed stage.

It enhances genetic diversity by combining traits from two parents.

It increases the fruit size by promoting cell division.

Correct Answer: A

Solution:

Apomixis mimics sexual reproduction by producing seeds without fertilization, resulting in genetically identical offspring, which is beneficial for maintaining uniformity in crop production.

To protect the pollen grain

To transport male gametes to the ovule

To produce nectar

To attract pollinators

Correct Answer: B

Solution:

The pollen tube transports male gametes to the ovule for fertilization.

It develops from the ovary alone

It develops from the thalamus along with the ovary

It does not contain seeds

It is not formed after fertilisation

Correct Answer: B

Solution:

Apple is considered a false fruit because it develops from the thalamus along with the ovary.

It allows for faster reproduction.

It enhances genetic diversity, providing a survival advantage.

It requires less energy from the parent plant.

It ensures the offspring are genetically identical to the parent.

Correct Answer: B

Solution:

Sexual reproduction introduces genetic variation, which can enhance survival in changing environments, unlike asexual reproduction which produces genetically identical offspring.

To protect the seed from environmental damage

To provide nutrition to the developing embryo

To facilitate pollination

To attract pollinators with its scent

Correct Answer: B

Solution:

The endosperm provides nutrition to the developing embryo, ensuring its growth and development.

Prevention of seed predation

Synchronization with favorable growth conditions

Increased genetic diversity

Enhanced pollination efficiency

Correct Answer: B

Solution:

Seed dormancy allows seeds to germinate only under favorable conditions, ensuring better survival and growth of seedlings.

It allows for the rapid production of genetically uniform crops.

It increases genetic diversity within the crop population.

It enhances the crop's resistance to pests and diseases.

It reduces the need for pollinators, ensuring consistent seed production.

Correct Answer: A

Solution:

The combination of apomixis and polyembryony allows for the rapid production of genetically uniform crops, which is beneficial for maintaining desired traits in agricultural production.

It prevents seeds from germinating immediately after formation

It ensures seeds germinate only in winter

It allows seeds to germinate without water

It makes seeds immune to pests

Correct Answer: A

Solution:

Seed dormancy prevents seeds from germinating immediately after formation, allowing them to be stored and used for future planting.

It prevents self-pollination and leads to seed dormancy.

It facilitates cross-pollination and leads to fruit formation.

It ensures pollen compatibility and leads to double fertilization.

It triggers apomixis and leads to asexual reproduction.

Correct Answer: C

Solution:

Pollen-pistil interaction involves events from pollen landing on the stigma to pollen tube entry into the embryo sac, ensuring compatibility and leading to double fertilization.

Chasmogamous flowers

Cleistogamous flowers

Self-incompatibility

Apomixis

Correct Answer: C

Solution:

Self-incompatibility is a mechanism that prevents self-pollination in flowers, ensuring genetic diversity.

To transport water to the flower

To carry nutrients to the ovary

To deliver male gametes to the embryo sac

To support the flower structure

Correct Answer: C

Solution:

The pollen tube grows through the style to deliver male gametes to the embryo sac for fertilisation.

Production of seeds without fertilization

Development of fruit without seed formation

Cross-pollination between different species

Formation of multiple embryos in a seed

Correct Answer: A

Solution:

Apomixis is a form of asexual reproduction that results in seed production without fertilization.

It provides structural support; formed by syngamy.

It acts as a storage tissue; formed by triple fusion.

It facilitates seed dispersal; formed by mitosis.

It aids in photosynthesis; formed by meiosis.

Correct Answer: B

Solution:

The endosperm acts as a storage tissue providing nutrition to the developing embryo and is formed by triple fusion during double fertilization.

Photosynthesis

Double fertilization

Transpiration

Pollination

Correct Answer: B

Solution:

Double fertilization is unique to flowering plants and involves the fusion of one male gamete with the egg cell (syngamy) and the other male gamete with two polar nuclei (triple fusion).

Cross-pollination between different plant species.

Inducing mutations through chemical agents.

Utilizing apomixis to produce seeds.

Employing genetic engineering to introduce new genes.

Correct Answer: C

Solution:

Apomixis allows for the production of seeds that are genetically identical to the parent plant, ensuring that the desired traits are consistently passed on without the variability introduced by sexual reproduction.

Polyembryony

Parthenocarpy

Apomixis

Self-incompatibility

Correct Answer: C

Solution:

Apomixis is a form of asexual reproduction that allows plants to produce seeds without fertilization, resulting in offspring that are genetically identical to the parent.

The seeds may have a higher chance of survival in nutrient-poor environments.

The seeds might be more susceptible to desiccation before germination.

The seeds could exhibit faster germination rates.

The seeds may show reduced viability over time.

Correct Answer: A

Solution:

Delayed endosperm development could allow the embryo to utilize stored nutrients more efficiently, increasing the seed's chances of survival in nutrient-poor environments.

It prevents seed germination under unfavorable conditions

It accelerates seed germination

It enhances seed dispersal

It increases seed size

Correct Answer: A

Solution:

Seed dormancy prevents germination under unfavorable conditions, ensuring seed survival.

High moisture content in the seed coat.

Presence of a thick, impermeable seed coat.

Constant exposure to sunlight.

Frequent germination cycles.

Correct Answer: B

Solution:

A thick, impermeable seed coat can protect the seed from environmental factors and pathogens, maintaining its viability over extended periods.

Sepals, as they protect the flower bud.

Petals, as they attract pollinators with their color and scent.

Stamens, as they produce pollen.

Ovary, as it develops into fruit.

Correct Answer: B

Solution:

Petals are often brightly colored and scented to attract pollinators, which is crucial for the pollination process and subsequent reproduction in flowering plants.

Apomixis

Cross-pollination

Cleistogamy

Self-pollination

Correct Answer: B

Solution:

Cross-pollination promotes genetic diversity and the combination of desirable traits from different parent plants, which can lead to enhanced nutritional content in hybrid crops.

Temporal isolation

Spatial isolation

Mechanical isolation

Genetic incompatibility

Correct Answer: A

Solution:

Temporal isolation involves differences in the timing of reproductive events, such as the maturation of stamens and stigmas, to prevent self-pollination.

It ensures that seeds only germinate in open, sunlit areas, reducing competition with parent plants.

It allows seeds to germinate during the night when predation risk is lower.

It enables seeds to synchronize germination with the rainy season.

It prevents seeds from germinating in nutrient-poor soils.

Correct Answer: A

Solution:

The specific wavelength requirement ensures that seeds germinate in open, sunlit areas, reducing competition with parent plants and increasing the chances of successful seedling establishment.

Asexual reproduction

Sexual reproduction

Vegetative propagation

Apomixis

Correct Answer: B

Solution:

Sexual reproduction enables the creation of new variants, enhancing survival advantage by increasing genetic diversity.

It ensures genetic diversity through self-pollination only.

It allows for both self-pollination and cross-pollination, maximizing reproductive success.

It reduces the need for pollinators, minimizing energy expenditure.

It restricts reproduction to specific environmental conditions.

Correct Answer: B

Solution:

Having both chasmogamous (open) and cleistogamous (closed) flowers allows a plant to self-pollinate when conditions are not favorable for pollinators, while also taking advantage of cross-pollination when pollinators are available, thus maximizing reproductive success.

True or False

Correct Answer: True

Solution:

Double fertilisation, involving syngamy and triple fusion, is a unique event in flowering plants, resulting in the formation of a diploid zygote and a triploid primary endosperm nucleus.

Correct Answer: False

Solution:

Self-pollination does not lead to seed formation in self-incompatible species.

Correct Answer: False

Solution:

Cleistogamous flowers are closed and self-pollinate without opening, preventing cross-pollination.

Correct Answer: False

Solution:

In angiosperms, the seed is the final product of sexual reproduction.

Correct Answer: True

Solution:

The zygote develops into the embryo following fertilization.

Correct Answer: False

Solution:

The primary endosperm nucleus is formed by the fusion of one male gamete with two polar nuclei, not two male gametes.

Correct Answer: True

Solution:

Polyembryony is the occurrence of more than one embryo in a seed, which can occur naturally in some angiosperms.

Correct Answer: True

Solution:

Some seeds, like those of the lupine, can remain viable for thousands of years.

Correct Answer: True

Solution:

Apomixis is a form of asexual reproduction that mimics sexual reproduction, resulting in seed formation without fertilisation.

Correct Answer: True

Solution:

During fertilization, the pollen tube releases two male gametes into the synergid.

Correct Answer: True

Solution:

Double fertilization involves syngamy and triple fusion, resulting in a diploid zygote and a triploid primary endosperm nucleus, a phenomenon unique to flowering plants.

Correct Answer: False

Solution:

The zygote in flowering plants often remains dormant for some time before developing into an embryo.

Correct Answer: True

Solution:

In angiosperms, seeds are indeed the final product of sexual reproduction.

Correct Answer: True

Solution:

Apomixis is a process where seeds are produced without fertilization, mimicking sexual reproduction.

Correct Answer: False

Solution:

The primary endosperm nucleus is triploid, formed by the fusion of three haploid nuclei.

Correct Answer: True

Solution:

After fertilization, the ovary develops into a fruit.

Correct Answer: True

Solution:

Apomixis is a form of asexual reproduction that results in seed formation without fertilization.

Correct Answer: True

Solution:

In angiosperms, endosperm development precedes embryo development to ensure the developing embryo has a nutritional supply.

Correct Answer: False

Solution:

Self-incompatibility is a mechanism that prevents self-pollination and promotes cross-pollination to enhance genetic diversity.

Correct Answer: True

Solution:

In angiosperms, the development of the endosperm precedes the development of the embryo, providing necessary nutrition.

Correct Answer: True

Solution:

In angiosperms, seeds develop from fertilised ovules and are enclosed within fruits.

Correct Answer: True

Solution:

Double fertilization, involving syngamy and triple fusion, is unique to flowering plants.

Correct Answer: True

Solution:

The text states that all flowering plants show sexual reproduction, highlighting the diversity and adaptations in structures to ensure this process.

Correct Answer: True

Solution:

Panchanan Maheshwari was indeed born in Jaipur and became a distinguished botanist.

Correct Answer: False

Solution:

The zygote develops into the embryo, not the endosperm.

Correct Answer: True

Solution:

Reproduction allows species to continue living through generations, providing a mechanism for species survival over long periods.

Correct Answer: True

Solution:

Reproduction is essential for the continuation of species as it allows them to survive through generations.

Correct Answer: False

Solution:

Apomixis is a form of asexual reproduction that mimics sexual reproduction, resulting in seed formation without fertilization.

Correct Answer: True

Solution:

In angiosperms, seeds are formed inside fruits and are the final product of sexual reproduction, typically described as fertilized ovules.

Correct Answer: False

Solution:

Double fertilisation is unique to flowering plants (angiosperms) and involves two fusion events within the embryo sac.

Correct Answer: True

Solution:

The excerpt explains that sexual reproduction enables the creation of new variants, which enhances survival advantage.

Correct Answer: True

Solution:

In angiosperms, the seed develops from a fertilised ovule and is the final product of sexual reproduction.

Correct Answer: False

Solution:

The primary endosperm nucleus (PEN) is triploid, formed by the fusion of one male gamete with two polar nuclei.

Correct Answer: False

Solution:

Flowers do not exist only for human use; they play a role in sexual reproduction.

Correct Answer: True

Solution:

Sexual reproduction enables the creation of new variants, enhancing survival advantage.

Correct Answer: True

Solution:

Polyembryony is the phenomenon where multiple embryos are formed within a single seed, observed in some angiosperms.

Correct Answer: False

Solution:

Sexual reproduction in flowering plants involves the formation of fruits and seeds as the end products, which are crucial for the propagation of the species.

Correct Answer: True

Solution:

Double fertilisation involves syngamy, where one male gamete fuses with the egg cell to form a zygote, and triple fusion, where the other male gamete fuses with two polar nuclei to form the primary endosperm nucleus.

Sexual Reproduction in Flowering Plants

AI Learning Assistant

Summary

Summary of Sexual Reproduction in Flowering Plants

Learning Objectives

Learning Objectives

Detailed Notes

Chapter Notes on Reproduction in Plants and Humans

Overview of Reproduction

Chapter Breakdown

Chapter 1: Sexual Reproduction in Flowering Plants

Chapter 2: Human Reproduction

Chapter 3: Reproductive Health

Key Terms and Definitions

Important Processes

Conclusion

Exam Tips & Common Mistakes

Common Mistakes and Exam Tips

Common Pitfalls

Exam Tips

Practice & Assessment

Multiple Choice Questions

Q1.Imagine a plant species that has developed a mechanism to produce seeds that can only germinate after passing through the digestive system of a specific animal. What evolutionary advantage does this provide?

Correct Answer: A

Q2.What is the role of the tapetum in pollen grain formation?

Correct Answer: B

Q3.Consider a scenario where a plant species has developed a unique adaptation where its seeds can remain dormant for extended periods until specific environmental conditions are met. What advantage does this adaptation provide?

Correct Answer: C

Q4.In a novel plant species, scientists have discovered that the ovules can develop into seeds without fertilization, but the seeds are genetically identical to the parent plant. What is this process an example of?

Correct Answer: A

Q5.Which part of the flower is involved in the process known as double fertilization, unique to angiosperms?

Correct Answer: C

Q6.Which part of the flower develops into seeds after fertilization?

Correct Answer: B

Q7.What is the primary function of the endosperm in seed development?

Correct Answer: B

Q8.Why is the bagging technique important in plant breeding programs?

Correct Answer: A

Q9.A plant breeding program aims to produce a hybrid crop with increased resistance to drought. Which reproductive strategy would be most beneficial for achieving this goal?

Correct Answer: B

Q10.Which process is unique to flowering plants and involves two fusion events in the embryo sac?

Correct Answer: C

Q11.Which of the following is a characteristic of double fertilization in angiosperms?

Correct Answer: C

Q12.What is apomixis?

Correct Answer: B

Q13.Which of the following structures in flowering plants is primarily responsible for the formation of seeds without fertilization, and what is this process called?

Correct Answer: B

Q14.In the context of seed dormancy, which of the following scenarios best illustrates the evolutionary advantage of seed dormancy in a plant species?

Correct Answer: B

Q15.Imagine a scenario where a biologist wants to prevent self-pollination in a plant species to study cross-pollination effects. Which technique would be most useful?

Correct Answer: B

Q16.Consider a plant breeding program aiming to develop a new variety of a crop that can withstand prolonged drought conditions. Which reproductive strategy would be most beneficial in ensuring the crop's survival and why?

Correct Answer: B

Q17.Which part of the flower develops into a fruit after fertilization?

Correct Answer: B

Q18.What is the primary purpose of sexual reproduction in flowering plants?

Correct Answer: B

Q19.Which of the following represents an application of apomixis in agriculture?

Correct Answer: A

Q20.Why is the zygote dormant for some time in a fertilised ovule?

Correct Answer: B

Q21.Which structure in a flower is responsible for producing pollen grains?

Correct Answer: B

Q22.In what way does apomixis mimic sexual reproduction, and why is it beneficial in agriculture?

Correct Answer: A

Q23.What is the role of the pollen tube during fertilization in flowering plants?

Correct Answer: B

Q24.Why is apple considered a false fruit?

Correct Answer: B

Q25.In the context of plant reproduction, what is the primary advantage of sexual reproduction over asexual reproduction?

Correct Answer: B

Q26.What is the primary function of the endosperm in flowering plants?

Correct Answer: B

Q27.In a hypothetical scenario, a flowering plant species has evolved a unique adaptation where its seeds remain dormant until exposed to specific environmental conditions. What is the primary advantage of this adaptation?

Correct Answer: B

Q28.A new variety of a flowering plant exhibits both apomixis and polyembryony. What could be a potential benefit of this combination for agricultural production?

Correct Answer: A

Q29.What is the significance of seed dormancy in agriculture?

Correct Answer: A