Q38 of 58 Page 69

Why cannot fertilisation take place in flowers if pollination does not occur?

The transfer of pollen grains from the anther of a flower to the stigma of the same or another flower is known as pollination. It is done by insects, birds, wind and water. For the process of fertilization, it is necessary that the male gamete reaches the female gamete. It can possible through the process of pollination. Hence, fertilisation cannot take place if pollination does not occur.


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36

From the internet, gather information about the chromosome numbers of five animals and five plants. Correlate the number with the size of organism and answer the following questions.

(a) Do larger organisms have more number of chromosomes/cells?


(b) Can organism with fewer chromosomes reproduce more easily than organisms with more number of chromosomes?


(c) More the of chromosomes/cells greater is the DNA content. Justify.

 37

In tobacco plant, the male gametes have twenty four chromosomes. What is the number of chromosomes in the female gamete? What is the number of chromosomes in the zygote?

 39

Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?

 40

Where is the zygote located in the flower after fertilization?