Consider the following statements regarding apomixis in farmers' context:

1. Hybrid seeds are expensive to produce yearly.
2. Apomixis prevents segregation of traits in hybrids.
3. Apomixis allows farmers to save and reuse seeds.
4. Apomixis reduces the yield of the crop.

Which of the above statements are correct?

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

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

Consider the following statements regarding the structure of the stamen:

1. The proximal end of the filament is attached to the thalamus or the petal.
2. The anther is generally a bilobed structure with each lobe having two theca.
3. The anther is a tetragonal structure consisting of four microsporangia.
4. The microsporangia develop further and become pollen sacs.

Which of the above statements are correct?

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

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

Consider the following statements regarding the microsporangium wall layers:

1. The epidermis is the outermost protective layer.
2. The endothecium helps in the dehiscence of the anther.
3. The tapetum nourishes the developing pollen grains.
4. Cells of the tapetum are always haploid and uninucleate.

Which of the above statements are correct?

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

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

Consider the following statements regarding sporopollenin:

1. It forms the exine of the pollen grain.
2. It is one of the most resistant organic materials known.
3. It can be degraded by specific enzymes secreted by the stigma.
4. It is absent at the germ pores.

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 3 only

Consider the following statements regarding the pollen grain cells:

1. The vegetative cell has abundant food reserve.
2. The vegetative cell has a large irregularly shaped nucleus.
3. The generative cell is small and floats in the cytoplasm of the vegetative cell.
4. The generative cell is spindle-shaped with dense cytoplasm.

Which of the above statements are correct?

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

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

Consider the following statements regarding pollen viability and storage:

1. Pollen viability in rice and wheat is about 30 minutes.
2. Pollen grains of Rosaceae and Solanaceae maintain viability for months.
3. Pollen grains can be stored in liquid nitrogen at -196 degrees Celsius.
4. Stored pollen can be used in crop breeding programmes.

Which of the above statements are correct?

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

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

Consider the following statements regarding the ovule (megasporangium):

1. The funicle attaches the ovule to the placenta.
2. The hilum is the junction between the ovule and the funicle.
3. The micropyle is located at the basal part of the ovule.
4. The nucellus is enclosed within the integuments.

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 3 only

Consider the following statements regarding megasporogenesis:

1. The Megaspore Mother Cell (MMC) differentiates in the micropylar region of the nucellus.
2. The MMC undergoes mitosis to form four megaspores.
3. In most flowering plants, three megaspores degenerate.
4. The functional megaspore develops into the embryo sac.

Which of the above statements are correct?

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

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

Consider the following statements regarding the embryo sac formation:

1. The nucleus of the functional megaspore divides mitotically to form two nuclei.
2. The 8-nucleate stage is followed immediately by cell wall formation for all nuclei.
3. Six of the eight nuclei are surrounded by cell walls.
4. The polar nuclei are situated below the egg apparatus in the central cell.

Which of the above statements are correct?

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

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

Consider the following statements regarding the cells of the mature embryo sac:

1. The egg apparatus consists of two synergids and one egg cell.
2. The filiform apparatus is present at the micropylar tip of the synergids.
3. Three cells at the chalazal end are called antipodals.
4. The large central cell contains three haploid polar nuclei.

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 3 only