Give one significant difference between each of the following:

Open vascular system and closed vascular system.

Give one significant difference between each of the following:

Uricotelism and Ammonotelism.

Give one significant difference between each of the following:

Auxetic growth and Accretionary growth.

Give reason for the following

Most people living in hilly region suffer from goiter.

Give reason for the following

 The water-potential of pure water changes when solute is added to it.

Give reason for the following

When we turn round and round, we lose our balance.

Give reason for the following

The spores of Bacillus thringiesis are used as bioinsecticide.

Give reason for the following

Owls have better night vision than day vision.

Give scientific terms for each of the following

Adjustment of the eye in order to obtain a clear vision of objects at different distances.

20.

Give scientific terms for each of the following

A device to measure growth in length of a plant.