Sexual Reproduction in Flowering Plants Solutions

Which of the following statements is incorrect regarding the mature pollen grain of most angiosperms at the time of shedding?

1. It generally consists of a vegetative cell and a generative cell.
2. The vegetative cell is larger and contains abundant food reserves.
3. The generative cell eventually forms two male gametes.
4. The pollen grain is usually released with three male gametes.

The fusion of one male gamete with the two polar nuclei results in the formation of:

1. Zygote
2. Embryo
3. Primary endosperm nucleus
4. Egg apparatus

Which of the following structures develops into the seed coat after fertilization?

1. Ovary wall
2. Integuments
3. Nucellus
4. Endosperm

Which one of the following correctly matches the structure with its function?

1. Endothecium – Nourishes developing pollen grains
2. Tapetum – Produces fibrous thickenings for anther dehiscence
3. Filiform apparatus – Guides pollen tube into the embryo sac
4. Antipodal cells – Produce male gametes

A flower that never opens and undergoes self-pollination is said to exhibit:

1. Dichogamy
2. Herkogamy
3. Cleistogamy
4. Xenogamy

Which statement regarding pollination is correct?

1. Autogamy always requires external pollinating agents.
2. Geitonogamy is genetically equivalent to cross-pollination.
3. Xenogamy involves transfer of pollen between different plants of the same species.
4. Geitonogamy always increases genetic variation.

After double fertilization, the triploid primary endosperm nucleus develops into the:

1. Embryo
2. Seed coat
3. Endosperm
4. Cotyledon

Which of the following structures is directly responsible for attracting and guiding the pollen tube toward the egg apparatus?

1. Antipodal cells
2. Egg cell
3. Synergids with filiform apparatus
4. Central cell

In most angiosperms, the pollen tube enters the embryo sac through the:

1. Chalaza
2. Integuments
3. Micropyle
4. Funicle

Which of the following correctly represents the sequence of events after pollination in a flowering plant?

1. Fertilization → Pollen germination → Pollen tube growth → Syngamy
2. Pollen germination → Pollen tube growth → Entry into embryo sac → Double fertilization
3. Pollen tube growth → Pollination → Fertilization → Seed formation
4. Pollination → Seed formation → Fertilization → Fruit formation

Double fertilization in flowering plants is unique because it involves:

1. Formation of two embryos
2. Fusion of one male gamete with two egg cells
3. Syngamy and triple fusion occurring in the same embryo sac
4. Fertilization occurring twice in two different flowers

In a typical angiosperm embryo sac, the number of nuclei and cells present at maturity is:

1. Four nuclei and four cells
2. Eight nuclei and seven cells
3. Seven nuclei and eight cells
4. Eight nuclei and eight cells

Sporopollenin, one of the most resistant organic substances found in nature, is present in the:

1. Intine
2. Exine
3. Germ pore
4. Vegetative cell

Which layer of the anther plays the most significant role in providing nourishment to developing pollen grains?

1. Epidermis
2. Endothecium
3. Middle layers
4. Tapetum

The process of development of a microspore into a mature male gametophyte in flowering plants is known as:

1. Megasporogenesis
2. Microsporogenesis
3. Microgametogenesis
4. Megagametogenesis