An ideal surface for respiration should

When the blood leaves the capillary bed most of the carbon dioxide is in the form of

The phenomenon through which root cells of a plant take in nitrate ions from the surrounding soil is

All the members of kingdom Protista are

Which of the following vertebrates has haemoglobin dissolved in the plasma?

The resemblance of euglenoids with plants and animals is significant in terms of

In which animal does the heart NOT receive oxygenated blood?

A cell wall consisting of two shells which overlap and fit together like a Petri dish is a characteristic of

Scientists are working on producing a wingless variety of silk moths to increase the yield of silk. The above statement shows the significance of which of the following branches of biology?

In ectomycorrhizae the hypa