A farmer plants two varieties of maize side by side, but notices that seeds. Class 9

A farmer plants two varieties of maize side by side, but notices that seeds. Class 9

Question 1.

A farmer plants two varieties of maize side by side, but notices that seeds form only when pollen from one variety reaches the stigma of the other. What type of pollination is this? Class 9

Answer:

This is cross-pollination, where pollen from one plant reaches the stigma of another plant of the same species.

(Page 218)

Question 2.

Why do animals with external fertilisation generally produce more eggs than animals with internal fertilisation? Class 9

Answer:

In external fertilisation, eggs and sperms are released into the water. Many eggs get washed away by water currents, eaten by predators, or fail to get fertilised. To ensure that at least some young ones survive, animals with external fertilisation produce a large number of eggs.

Question 3.

In animals, which fertilisation method the gametes are more protected? Class 9

Answer:

In internal fertilisation, the gametes are more protected because fertilisation takes place inside the body of the female, where the eggs and sperms are safe from external dangers.