Q6 of 49 Page 1

The male gametes of rice plant have 12 chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively,

The chromosome number in female gamete would be same as the male gamete. So, the number of chromosomes would be 12. Zygote would have double the parent’s chromosome as it is a diploid (2n) so 24 chromosomes would be there in a zygote. The cells of the seedling will be 24. The seedling is developed from the zygote so it would be a diploid.

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4

A few statements with regard to sexual reproduction are given below:

i. Sexual reproduction does not always require two individuals


ii. Sexual reproduction generally involves gametic fusion


iii. Meiosis never occurs during sexual reproduction


iv. External fertilisation is a rule during sexual reproduction


Choose the correct statements from the options below:


 5

A multicellular, filamentous alga exhibits a type of sexual life cycle in which the meiotic division occurs after the formation of zygote. The adult filament of this alga has

7

Given below are a few statements related to external fertilization. Choose the correct statements.

i. The male and female gametes are formed and released simultaneously


ii. Only a few gametes are released into the medium


iii. Water is the medium in a majority of organisms exhibiting external fertilization


iv. Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism


 8

The statements given below describe certain features that are observed in the pistil of flowers.

i. Pistil may produce more than one seed


ii. Each carpel may have more than one ovule


iii. Each carpel has only one ovule


iv. Pistil have only one carpel


Choose the statements that are true from the options below: