In the oceans,the environment is perpetually dark at depths of:

Which of the following is a climatic factor?

Based on temperature,plants are classified by:

The temperature gradient over the Earth's surface is:

In which of the following habitats does the diurnal temperature of the soil surface vary the most?

Write a short note on:
$(a)$ Adaptations of desert plants and animals
$(b)$ Adaptations of plants to water scarcity
$(c)$ Behavioural adaptations in animals
$(d)$ Importance of light to plants
$(e)$ Effect of temperature or water scarcity and the adaptations of animals.