Question 1:
What is meant by pollination?
Answer:
The transfer of pollen grains from the anther to the stigma
What is meant by pollination?
Answer:
The transfer of pollen grains from the anther to the stigma
Question 2:
Pollination is very important to ensure that reproduction in flowering plants occurs successfully. Explain.
Answer:
Pollination transfers pollen grains from anther to stigma. The presence of pollen grains on the stigma initiates the fertilisation.
Pollination is very important to ensure that reproduction in flowering plants occurs successfully. Explain.
Answer:
Pollination transfers pollen grains from anther to stigma. The presence of pollen grains on the stigma initiates the fertilisation.
Question 3:
During the formation of pollen grain, the microspore mother cell divides by meiosis and produces tetrad. State the features of the tetrad and the importance of such features.
Answer:
Tetrad cells are haploid to maintain the number of chromosomes in the zygote after fertilisation.
During the formation of pollen grain, the microspore mother cell divides by meiosis and produces tetrad. State the features of the tetrad and the importance of such features.
Answer:
Tetrad cells are haploid to maintain the number of chromosomes in the zygote after fertilisation.
Question 4:
The generative nucleus divides by mitosis in the pollen tube. State the importance of this process.
Answer:
Produces two nuclei, namely the tube nucleus that will form the pollen tube and the generative nucleus that will form the male gametes.
The generative nucleus divides by mitosis in the pollen tube. State the importance of this process.
Answer:
Produces two nuclei, namely the tube nucleus that will form the pollen tube and the generative nucleus that will form the male gametes.
Question 5:
The megaspore cell contains eight nuclei. How does this occur?
Answer:
The nucleus of megaspore mother cell with undergo mitosis three times to produce eight nuclei.
The megaspore cell contains eight nuclei. How does this occur?
Answer:
The nucleus of megaspore mother cell with undergo mitosis three times to produce eight nuclei.
Question 6:
State the role of double fertilisation in ensuring the survival of flowering plants.
Answer:
The fertilisation of male and female gametes produces a diploid zygote and transmits genetic information to the next generation. The fusion of the second male gamete with the polar nuclei to form a triploid endosperm nucleus that will develop into the endosperm tissue. This tissue supplies food for seed germination.
State the role of double fertilisation in ensuring the survival of flowering plants.
Answer:
The fertilisation of male and female gametes produces a diploid zygote and transmits genetic information to the next generation. The fusion of the second male gamete with the polar nuclei to form a triploid endosperm nucleus that will develop into the endosperm tissue. This tissue supplies food for seed germination.