Consider the following statements about polyembryony and hybrid seeds:

1. Polyembryony is the occurrence of more than one embryo in a seed.
2. In Citrus, nucellar cells surrounding the embryo sac develop into embryos.
3. Hybrid seeds must be produced every year because progeny segregate characters.
4. Using apomixis in hybrids prevents the segregation of characters.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1 and 2 only
• 3 and 4 only
• 1, 2 and 3
• 1, 2, 3 and 4

Consider the following statements regarding the pollen-pistil interaction:

1. The pistil has the ability to recognise compatible and incompatible pollen.
2. Recognition is mediated by chemical components.
3. Compatible pollen germinates on the stigma to produce a pollen tube.
4. The pollen tube enters the ovule through the chalaza.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only
• 1, 2 and 4

Consider the following statements about artificial hybridisation:

1. Emasculation is the removal of the stigma from the flower bud.
2. Emasculation is necessary if the female parent bears bisexual flowers.
3. Bagging is done to prevent contamination of the stigma with unwanted pollen.
4. Unisexual female flowers do not require emasculation.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only
• 2 and 3 only

Consider the following statements regarding the gametes involved in double fertilisation:

1. One male gamete fuses with the egg cell.
2. The second male gamete fuses with the synergids.
3. The two polar nuclei fuse with a male gamete.
4. The male gametes are released into the cytoplasm of the synergid.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 4
• 1, 3 and 4
• 2 and 3 only
• 1 and 4 only

Consider the following statements about the ploidy of structures after fertilisation:

1. The zygote is diploid (2n).
2. The Primary Endosperm Nucleus (PEN) is triploid (3n).
3. The cells of the endosperm tissue are triploid.
4. The antipodals persist and become triploid.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only
• 1 and 2 only

Consider the following statements regarding post-fertilisation structural changes:

1. The ovary develops into the fruit.
2. The ovules develop into seeds.
3. The outer integument becomes the tegmen.
4. The wall of the ovary becomes the pericarp.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 1, 2 and 4
• 2, 3 and 4
• 1 and 4 only

Consider the following statements about the embryo in grasses:

1. The scutellum is the single cotyledon.
2. The epiblast is a second functional cotyledon.
3. The coleorhiza is a sheath enclosing the radicle.
4. The coleoptile is a sheath enclosing the plumule.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 3 and 4
• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only

Consider the following statements regarding the fate of floral parts:

1. Sepals always fall off after fertilisation.
2. Petals and stamens usually wither and fall off.
3. The pistil remains attached to the plant.
4. In some plants like tomato and brinjal, sepals persist.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only
• 2 and 3 only

Consider the following statements about Parthenocarpy:

1. It is the formation of fruits without fertilisation.
2. It produces seedless fruits.
3. Banana is a natural parthenocarpic fruit.
4. It cannot be induced artificially.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1, 2 and 3
• 2, 3 and 4
• 1 and 4 only
• 1 and 3 only

Consider the following statements regarding seed storage:

1. Dehydration is crucial for seed storage.
2. Dormancy allows seeds to survive unfavourable conditions.
3. Seeds must be kept moist to maintain viability during storage.
4. Metabolic activity in dormant seeds is very high.

Which of the above statements are correct?

[Sexual-Reproduction-in-Flowering-Plants] [class-xii]

• 1 and 2
• 2 and 3
• 3 and 4
• 1 and 4