The root hairs are suited for absorbing water from the soil because:

1. They have a large surface area
2. They have a semi-permeable membrane
3. They contain a solution of higher concentration than the surrounding water.
4. All the three.

Transpiration is defined as:

1. the rise of water up to the stem of a plant.
2. the elimination of water with dissolved water products.
3. the loss of water as water vapour from the aerial parts of a plant.
4. the loss of water as water vapour from the roots as well as the leaves of the plant.

Vinay has kept a small herbaceous plant in a test tube containing water. The surface of the water is covered by a layer of oil. After three hours, he observed that the level of water in the test tube has decreased. This is due to:

1. Absorption
2. Transpiration
3. Wilting
4. Both (1) and (2)

Root hairs are the epidermal outgrowths of the outermost layer of roots. They are well-suited for absorption of water from soil due to which of the following features ?

P. Large surface area.
Q. Lower concentration of cell sap.
R. Semi permeable nature of the cell membrane.

1. Only P
2. Only Q
3. Only P and Q
4. Only P and R