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  4. Sexual Reproduction in Flowering Plants Chapter-Wise Test 2

Sexual Reproduction in Flowering Plants Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about nectaries in flowers is correct?

Nectaries secrete nectar to attract pollinators, thus playing a key role in cross-pollination.
Nectaries produce pollen grains.
Nectaries are found exclusively in wind-pollinated flowers.
Nectaries inhibit pollinator visits by emitting repulsive chemicals.
1

Nectaries are specialized structures that produce nectar, which attracts pollinators and facilitates effective cross-pollination.

Which statement about polyembryony in flowering plants is correct?

Polyembryony results in a single embryo from a fertilized ovule.
Polyembryony is the formation of multiple embryos from a single fertilized ovule.
Polyembryony decreases seed viability.
Polyembryony is a form of asexual reproduction.
2

Polyembryony is the development of more than one embryo from a single fertilized ovule, sometimes resulting in multiple seedlings from one seed.

Which of the following statements about cleistogamy is correct?

Cleistogamy involves pollination in fully open flowers.
Cleistogamy refers to self-pollination in closed flowers, ensuring reproduction without external pollinators.
Cleistogamy promotes cross-pollination between different plants.
Cleistogamy is typical of wind-pollinated species.
2

Cleistogamy is the phenomenon of self-pollination occurring within closed flowers, which guarantees seed production when pollinators are scarce.

Which of the following best describes the function of petals in many flowering plants?

They produce pollen
They protect the ovary
They attract pollinators through color and fragrance
They facilitate seed dispersal
3

Petals are typically colorful and fragrant to attract pollinators, playing a crucial role in the pollination process.

Which process is responsible for ensuring genetic variation in sexual reproduction of flowering plants?

Mitosis in the sporophyte
Fusion of gametes during fertilization
Meiosis during gametogenesis
Clonal propagation
3

Meiosis during gametogenesis produces genetically varied gametes, which is the primary source of genetic variation in sexual reproduction.

Which of the following statements about ethylene's role in fruit ripening is incorrect?

Ethylene stimulates ripening in climacteric fruits.
Ethylene production increases during the ripening process in climacteric fruits.
Ethylene delays fruit ripening.
Ethylene is a gaseous hormone involved in fruit softening and color change.
3

Ethylene is known to promote, not delay, fruit ripening, especially in climacteric fruits.

Which of the following statements about seed dormancy is correct?

Seed dormancy prevents germination under unfavorable environmental conditions.
Seed dormancy causes immediate germination once the seed is released.
Seed dormancy is absent in all endospermic seeds.
Seed dormancy only occurs in seeds that develop through apomixis.
1

Seed dormancy is an adaptive trait that prevents germination during unsuitable environmental conditions, ensuring seedling survival.

Which of the following statements about the evolutionary advantage of cross-pollination is correct?

Cross-pollination promotes genetic variability, enhancing adaptability and survival of plant populations.
Cross-pollination produces genetically identical offspring.
Cross-pollination reduces the chance of genetic recombination.
Cross-pollination limits the potential for natural selection.
1

By promoting genetic recombination, cross-pollination increases genetic diversity, which is beneficial for adaptation and evolution.

Which of the following statements about the role of the funiculus in an ovule is correct?

The funiculus connects the ovule to the ovary wall and facilitates nutrient transport.
The funiculus develops into the seed coat.
The funiculus attracts pollinators to the ovule.
The funiculus becomes the embryo sac after fertilization.
1

The funiculus is a stalk-like structure that attaches the ovule to the placenta within the ovary, aiding in nutrient transfer.

Which of the following statements about the significance of cross-pollination is correct?

Cross-pollination enhances genetic diversity and leads to more resilient plant populations.
Cross-pollination results in genetically identical offspring.
Cross-pollination is less beneficial than self-pollination for adaptability.
Cross-pollination always results in reduced fruit size.
1

Cross-pollination increases genetic variability among offspring, which is advantageous for adaptation and overall species survival.

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