Sexual Reproduction in Flowering Plants
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Megasporogenesis in flowering plants refers to:

The formation of microspores by mitosis.
The formation of megaspores by meiosis in the nucellus.
The fusion of male and female gametes.
The formation of pollen grains by mitosis.
2

Megasporogenesis is the process in which the megaspore mother cell undergoes meiosis to produce megaspores in the nucellus.

Which of the following best describes dichogamy in flowering plants?

Temporal separation of male and female reproductive phases within the same flower
Spatial separation of male and female organs
Genetic incompatibility between self and non-self pollen
Pollen dispersal by wind
1

Dichogamy refers to the temporal separation of male and female phases in the same flower, helping to reduce self-pollination.

Which part of the flower is primarily responsible for attracting pollinators?

Sepals
Petals
Stamens
Ovary
2

Petals are typically brightly colored and scented to attract pollinators such as insects, birds, and bats.

Which layer of the anther is primarily responsible for generating the tension that leads to anther dehiscence?

Epidermis
Endothecium
Tapetum
Connective tissue
2

The endothecium develops fibrous thickenings which create tension, leading to the opening (dehiscence) of the anther to release pollen.

Which of the following statements about the evolution of floral traits is correct?

Floral traits evolve in response to pollinator preferences, enhancing reproductive success.
Floral traits remain unchanged over evolutionary time.
Floral traits have no impact on the efficiency of pollination.
Floral traits are solely determined by genetic drift.
1

Floral traits such as shape, color, and fragrance evolve under selective pressures from pollinators, thereby improving pollination efficiency and reproductive success.

Which of the following statements about embryogenesis in flowering plants is correct?

After fertilization, the zygote undergoes mitotic divisions to form a proembryo that differentiates into the embryo proper.
The zygote immediately develops into a mature embryo without any cell division.
Multiple zygotes fuse together to form a single embryo.
Embryogenesis in flowering plants occurs without fertilization.
1

After fertilization, the zygote divides mitotically to form a proembryo, which then differentiates into the mature embryo.

Which one of the following statements about double fertilization in angiosperms is correct?

It involves the fusion of one sperm with one egg only.
It results in the formation of both the zygote and the endosperm.
It occurs only in gymnosperms.
It does not involve the formation of endosperm.
2

Double fertilization is unique to flowering plants—it involves one sperm fertilizing the egg (forming the zygote) and another fusing with the two polar nuclei to form the endosperm.

Which part of the flower is primarily responsible for producing pollen grains?

Carpel
Stamen
Petal
Sepal
2

The stamen, which consists of the anther and filament, is responsible for producing pollen grains (male gametes).

Plants bearing separate male and female flowers on the same individual are termed:

Dioecious
Monoecious
Hermaphroditic
Polygamous
2

Monoecious plants bear both male (staminate) and female (pistillate) flowers on the same individual, promoting cross-pollination.

Which of the following components is a key part of a pollen grain?

Exine and intine
Embryo sac and ovule
Integuments and chalaza
Funiculus and placenta
1

Pollen grains are composed of an outer resistant layer called the exine and an inner layer called the intine, along with cells that develop into sperm.

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