During hibernation,the body temperature of warm-blooded animals remains:

Select the correct statements from the following regarding gaseous exchange in plants.
$A$. $A$ terrestrial plant has many air spaces between the cells of leaf and root.
$B$. Woody trees have stomata on bark.
$C$. In aerated soil,oxygen dissolved in water enters root tissue by diffusion.
$D$. Vascular bundles provide thin and large surface area for exchange of gases.
$E$. Carbon dioxide and water vapour diffuse into lenticels.

Respiration is a ........ process.

The term 'Guttation' was coined by:

When we perform physical exercise,the energy demand is:

Which of the following statements is correct?