B. Answer the following questions .
1.How does reproduction take place in flowering plants?
2. Write any two differences between self-pollination and cross pollination?
3. What are the features of seeds dispersed by wind and water?
4. Explain the different stages of germination?
Answers
Answer:
1. Sexual reproduction in flowering plants involves the production of male and female gametes, the transfer of the male gametes to the female ovules in a process called pollination. After pollination occurs, fertilization happens and the ovules grow into seeds within a fruit.
2. Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant. Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.
3. Some have a parachute-like structure to keep them afloat. Some fruits—for example, the dandelion—have hairy, weightless structures that are suited to dispersal by wind. Seeds dispersed by water are contained in light and buoyant fruit, giving them the ability to float.
4. Once the seed is metabolically activated, germination proceeds according to the following stages: The seed coat (testa) ruptures and the embryonic root (radicle) grows into the ground to extract key nutrients and minerals. The cotyledon emerges and produces the growing shoot's first leaves.