Question

Assertion : Protandry and protogyny ensure cross fertilisation in some animals.
Reason : Cross fertilisation introduces variation in progeny.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Most of the sexually reproducing animals are either males or females. But in some lower animals, the organs of both the sexes are found in the same individual. These are called bisexual or monoecious animals or hermaphrodites. In these animals, testes and ovaries do not mature simultaneously. In some, testes mature earlier, while in others, ovaries mature earlier. These conditions are respectively called protandry and protogyny. They ensure cross fertilisation. Cross fertilisation is a process in wwhich gametes derived from different individuals are united to form zygote. It involves the mixing of two different genetic materials. It is better than self-fertilisation as it introduces variation by combining traits of two individuals.