Leaf fall can be induced by

1. cytokinins
2. auxin
3. abscisic acid
4. ethylene

Assertion(A): Loss of water as tiny drops along the margins of the tips of leaves, especially in the early morning is called guttation.

Reason: Excessive root pressure is responsible for guttation.

1. Both A and R are true
2. Both A and R are false
3. Ais true and R is false
4. A is false and R is true

The declining phase of a population occurs when

1. Mortality > Natality
2. Natality > Mortality
3. Mortality = Natality
4. Natality = Mortality = 0

Harish was fond of eating dryfruits. He put some raisins in the water for 5-6 hours. After few hours, the raisins were all swelled up. This was due to

1. endosmosis
2. exosmosis
3. osmoregulation
4. no osmosis