Sexual Reproduction in Flowering Plants Chapter-Wise Test 6

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which pollinator is most commonly associated with entomophilous (insect) pollination in flowering plants?

Bats
Bees
Birds
Wind
2

Bees are one of the most common insect pollinators and play a key role in transferring pollen between flowers.

Which of the following statements about floral scent and pollinator attraction is correct?

Floral scent acts as a chemical cue to attract specific pollinators, enhancing the chances of effective pollination.
Floral scent has no effect on pollinator behavior.
Floral scent only repels potential pollinators.
Floral scent is produced solely by the pollen grains.
1

Many flowers emit specific scents that attract particular pollinators, thereby increasing the likelihood of successful cross-pollination.

Polyembryony in flowering plants refers to:

Formation of multiple ovules in one ovary
Development of multiple embryos from a single fertilized ovule
Fusion of several pollen grains to form a compound pollen grain
Formation of several fruits from one flower
2

Polyembryony is the phenomenon where more than one embryo develops from a single fertilized ovule.

Which structure of the flower develops into the fruit after fertilization?

Stamen
Petal
Ovary
Sepal
3

After fertilization, the ovary transforms into a fruit, which encloses the developing seeds.

What is the ploidy level of the endosperm formed by double fertilization in angiosperms?

Haploid
Diploid
Triploid
Tetraploid
3

In double fertilization, one sperm fuses with the egg to form a diploid zygote, and the other fuses with the two polar nuclei to form a triploid endosperm.

Which of the following statements comparing sexual and asexual reproduction in flowering plants is correct?

Sexual reproduction, through processes like double fertilization, increases genetic recombination and diversity among offspring.
Asexual reproduction produces greater genetic variation than sexual reproduction.
Sexual reproduction results in genetically identical offspring.
Asexual reproduction always involves the fusion of gametes.
1

Sexual reproduction involves the fusion of gametes and subsequent genetic recombination, which results in increased genetic diversity compared to asexual reproduction.

Which of the following is the most common type of embryo sac found in flowering plants?

Oenothera type
Allium type
Polygonum type
Drusa type
3

The Polygonum type embryo sac is the most common type in angiosperms, typically having seven cells and eight nuclei.

Which of the following statements about the structure of a mature pollen grain is correct?

A mature pollen grain contains one vegetative cell and one generative cell (or two sperm cells, if the generative cell divides) depending on the species.
A mature pollen grain contains three vegetative cells.
A mature pollen grain contains no generative cells.
A mature pollen grain always contains only a single cell.
1

A mature pollen grain typically comprises one vegetative cell and one generative cell; in many species, the generative cell divides to form two sperm cells.

Which of the following statements about the genetic basis of self-incompatibility is correct?

Self-incompatibility is governed by multiple alleles at the S-locus, preventing self-fertilization.
Self-incompatibility is controlled by a single gene with no allelic variation.
Self-incompatibility operates independently of the plant’s genotype.
Self-incompatibility is only observed in asexual reproduction.
1

Self-incompatibility is a genetically controlled mechanism, typically involving multiple alleles at the S-locus, which prevents self-fertilization and promotes cross-pollination.

Which of the following best describes the role of antipodal cells in the embryo sac?

They fuse with the sperm cell to form the zygote
They assist in nourishing the embryo sac before degenerating
They develop into the endosperm
They form the seed coat
2

Antipodal cells are thought to help in nourishing the embryo sac and usually degenerate later in development.

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