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

Why should we conserve forests and wildlife?

1. To maintain balance
2. To protect biodiversity
3. To continue food chain
4. All of the above

Which of these is not a vestigial organ in human beings?

1. Appendix
2. Wisdom tooth
3. Gall bladder
4. Nictitating membrane