Water

Q.

Salt concentration (Salinity) of the sea measured in parts per thousand is:

1. 0 – 5

2. 30 – 35

3. 10 – 15

4. 30 – 70

Q. Upper layer of water in a water body is known as

1. Hypolimnion
2. Epilimnion
3. Thermocline
4. Hydroline

Q. Two chambers, A and B, containing solutions are separated by a semipermeable membrane.

(f) If one chamber has a Ψ of – 2000 kPa, and the other – 1000 kPa, which is the chamber that has the higher Ψ?

Q. Hygroscopic water is not available to plants because

1. DPD is greatly decreased
2. $\Psi$ becomes strongly negative
3. $\Psi$ is increased and DPD is decreased
4. $\Psi$ is greatly increased

Q. What do you mean by hydroscopic water and combined water in the soil?

Q. Salt concentration of the sea measured in parts per thousand is

1. 10-5
2. 30-70
3. 0-5
4. 30-35

Q. The BOD of two water samples, A and B, are 2 mg/L and 8 mg/L respectively. Choose the most appropriate option from the following.

Q. Value of water potential for pure water is

1. 1
2. 2
3. 3
4. 0

Q. Which of the following has the highest water potential $\left(\Psi \right)$?

1. 1 M salt solution
2. 1 M sugar solution
3. 1 M sugar solution with 2.3 bars pressure applied on it
4. Distilled water

Q. Study the following table showing the components of water potential of four cells of an actively transpiring monocot plant.

Cell	Osmotic potential	Pressure potential
	(MPa)	(MPa)
A	-0.9	0.5
B	-0.8	0.6
C	-0.6	0.1
D	-0.7	0.4

Identify the four cells as root hair, general cortical cell, passage cell and pericyclic cells of young root respectively (assume symplast flow).

1. B, D, A, C
2. B, D, C, A
3. A, D, B, C
4. B, C, D, A

Q. Process of re-radiating heat by atmospheric dust water vapour, ozone, $C{O}_2$, etc. is known as:

1. Greenhouse effect
2. $C{O}_2$ fertilization effect
3. Radioactive effect
4. Ozone depletion effect

Q. The minimal point of water content in the soil required for the survival of plants is called ___

1. Field capacity
2. Hypolimnion
3. Thermocline
4. Wilting point

Q. New Centre for Ganga River Basin Management and Studies is launched in

1. New Delhi
2. Kanpur
3. Lucknow
4. Varanasi

Q. Water is an essential commodity for survival. What can we do to help increase water resources?

1. Deforestation
2. Afforestation
3. Reducing the use of vehicles
4. The burning of the wastage

Q. The earth has more water than land but still there is a shortage of water, why?