Which one of the following conditions is true for the state of stomata of a green leaf shown in given diagram?

1. Large amount of water flows into the guard cells.
2. Gaseous exchange is occurring in large amount.
3. Large amount of water flows out from the guard cells.
4. Large amount of sugar collects in the guard cells.

In which of the following is a concave mirror used?

1. A solar cooker
2. A rear view mirror in vehicles.
3. A safety mirror in shopping malls.
4. In viewing full size image of distant tall buildings.

The following diagram shows the use of an optical device to perform an experiment of light. As per the arrangement shown, the optical device is likely to be a;

1. Concave mirror
2. Concave lens
3. Convex mirror
4. Convex lens

A ray of light starting from the air passes through medium A of refractive index 1.50, enters medium B of refractive index 1.33 and finally enters medium C of refractive index 2.42. If this ray emerges out in the air from C, then for which of the following pairs of media the bending of light is least?

1. air-A
2. A-B
3. B-C
4. C-air