d) food manufacture
1.1 Multiple Choice Questions-
1. Xylem and phloem are responsible for
a)Storing food b) transporting materials c) growth
2. Mycelia are found in
a) Ferns b) mosses c) Moulds d) bacteria
3. When a body absorbs light of all the colours, it appears
a) Blue
b) Black c) Yellow d) Red
4. Echoes occur because sound is by solid surfaces
a) Reflected b) Absorbed
c) Densed
d) Vibrated
5. The pH of pure water is
a) 0.0 b) 1.0
c) 7.0 d) 14.0
6. Which of the following is a soft metal?
a) Iron
b) Sodium
c) Copper d) Lead
Answers
Answer:
Explanation:
. Root cap has no role in absorption because it has
(a) no direct connection with vascular system
(b) loosely arranged cells
(c) no cells containing chloroplasts
(d) no root hairs
Answer: (d) no root hairs
2. Wilting of the plant occurs when
(a) phloem is blocked
(b) xylem is blocked
(c) both xylem and phloem are blocked
(d) a few old roots are removed
Answer: (b) xylem is blocked
3. Which of the following is a rapid type of absorption?
(a) passive absorption
(b) active absorption
(c) root absorption
(d) salt absorption
Answer: (a) passive absorption
4. Xylem transport of water in tall trees appears to be mainly due to
(a) metabolic activity in xylem cells
(b) root pressure
(c) capillary rise in xylem open pipes
(d) transpiration pull and cohesion of water molecules
Answer: (d) transpiration pull and cohesion of water molecules
5. In active absorption of water
(a) energy is not used
(b) the transpiration pull provides force for absorbing water
(c) the root respiration gives energy
(d) the photosynthesis provides energy
Answer: (c) the root respiration gives energy
6. Water available to the plants is
(a) runoff water
(b) gravitational water
(c) hygroscopic water
(d) capillary water
Answer: (d) capillary water
7. The main source of water for the soil is
(a) precipitation
(b) capillary water
(c) hygroscopic water
(d) estuarine water
Answer: (a) precipitation
8. The process by which water enters the roots due to diffusion is termed as
(a) endocytosis
(b) active absorption
(c) osmosis
(d) passive absorption
Answer: (c) osmosis
9. Root pressure is maximum when
(a) transpiration is very high and absorption is very low
(b) transpiration is very low and absorption is very high
(c) both transpiration and absorption are very high
(d) both the absorption and transpiration are very low
Answer: (b) transpiration is very low and absorption is very high
10. Passive absorption of water from the soil by root hair is mainly affected by
(a) respiratory activity of root
(b) typical tissue organisation of root
(c) tension on the cell sap due to transpiration
(d) root pressure developed in the cortical cells of the roots
Answer: (c) tension on the cell sap due to transpiration
11. The entry of water from soil up to xylem elements of roots is because of
(a) ion concentration in water
(b) turgor pressure
(c) gradient of suction pressure
(d) degree of imbibition
Answer: (c) gradient of suction pressure
12. Water potential of the root hair cells is
(a) equal to soil water
(b) more negative than that of soil water
(c) more positive in comparison to soil water
(d) none of the above
Answer: (b) more negative than that of soil water
13. Water will be absorbed by the root hairs when the external medium is
(a) isotonic
(b) hypertonic
(c) hypotonic
(d) viscous
Answer: (c) hypotonic
14. Which of the following plants absorb water from the air?
(a) Orchids
(b) Ficus
(c) Cuscuta
(d) Brassica
Answer: (a) Orchids
15. Active absorption of water by roots from the soil is mainly affected by
(a) osmotic concentration of cell sap
(b) tension in cell sap due to transpiration
(c) sucking power of the root hairs
(d) typical tissue organisation
Answer: (a) osmotic concentration of cell sap
16
Answer:
3) black
4) reflected
Explanation:
pls mark as brainliest answer pls mark as brainliest answer