Prakash is a resident of hilly region where iodine is deficient in soil and hence in the food grown there. He started developing swelling in the neck. This was due to

1. simple goitre
2. cretinism
3. myxoedema
4. exophthalmic goitre

The condition affecting the older people who cannot see nearby objects clearly is called

1. presbyopia
2. cataract
3. astigmatism
4. hyperopia

The difference between the birth rate and the death rate is called

1. natality
2. mortality
3. growth rate of population
4. population density

Which phytohormone have specific effects on cell division?

1. Ethylene
2. Gibberellins
3. Cytokinin
4. Auxin