Neural Control and Coordination

When we migrate from dark to light, we fail to see for some time but after a time visibility becomes normal. It is an example of

1. accommodation
2. adaptation
3. mutation
4. photoperiodism

Which of the following statements is the characteristic of human cornea?

1. It is secreted by conjunctiva and glandular layer.
2. It is a lacrimal gland which secretes tears.
3. Blood circulation is absent in cornea.
4. In old age it becomes the cause of cataract.

Depolarization of axolemma during nerve conduction takes place because of

1. equal amount of Na+ and K+ move out across axolemma
2. Na+ move inside and K+ move more outside
3. more Na+ outside
4. none of these

Which food should be eaten during deficiency of rhodopsin in eyes?

1. Carrot and ripe papayas
2. Guava, banana
3. Mango and potato
4. None of the above