MCQs

Prions are infectious proteins known to cause

The given diagram represents the entry of food particle K in trachea. Which of the following reasons could be responsible for the entry of particle K into larynx instead of oesophagus?

In photorespiration, Rubisco fixes oxygen instead of an inorganic compound. This causes a decrease in the rate of

In the earthworm, the diffusion of oxygen into cells is carried out by

The diaphragm becomes dome shaped when

Which of the following is TRUE about ‘imbibition’ in plants?

Cyanobacteria are used to convert waste land into cultivatable land. Which of the following features of cyanobacteria is indicated here?

The movement of which of the following ions regulates the opening of the stomata?

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