Question

How do organisms which cannot migrate tend to overcome adverse environmental conditions? Explain taking one example each from vertebrates and angiosperms respectively.

Answer 1

$\bold{Answer}$

When an animal is unable to migrate ,it can avoid stress by escaping in time. As an example the polar bear undergoes hibernation in winters and some snails and fish go into aestivation in summer.

The $\bold{angiosperms}$ show modification to adapt to their surroundings such as modification of leafs into spines in Opuntia, opening of stomata at night time in xerophytic plants, the presence of aerenchyma in leaves and stem of $\bold{aquatic}$ plants. In higher plants seeds serve as means to tide over periods of stress and go into a state of ' $\bold{Dormancy}$ ' during stress.

Answer 2

Answer:

Organisms which cannot migrate tend to overcome adverse environmental conditions by developing several methods. In angiosperms, seeds and some other vegetative reproductive structures serve as means to tide over periods of stress.