Mineral Nutrition — BIOLOGY STD 11 Science — Question

What term is given to:

1. The centriole-like structure from which a cilium/ flagellum emerges?
2. The core of a cilium/ flagellum?

The enzymes activity gets destroyed on increasing high temperature. What happens during that state that enzyme looses its activity?

A student cultures a callus from the tobacco pith in a sterilised minimal nutritive medium, but adds more cytokinins than auxins. What would develop first from the callus the shoot buds or the roots?

Write the scientific name of:

1. The freshwater sponge.
2. The cnidarian that has both polyp and medusa.

How is the rate of heart beat determined from the ECG?

Where does the exchange of gases take place in lungs?

Define determinate growth.

By which covering are the human lungs covered?

Mention the conditions when only cyclic photophosphorylation occurs.

Name one plant product through which we use phloem fibres commercially.