3226: Salinization occurs when the irrigation water accumulated in the soil evapo- rates, leaving behind salts and minerals. What are the effects of salinization on the irrigated land?
(a) It greatly increases the crop production.
(b) It makes some soils impermeable.
(c) It raises the water table.
(d) It fills the air spaces in the soil with water.
3227: Assertion (A)
Photosynthesis and vision are the phenomenon of visible light
Reason (R)
The visible light is absorbed by small particles containing chlorophylls as well as the retina of the eye
(a) if A and R both are correct and R is the correct explanation of A
(b) if A and R both are correct but R is not the correct explanation of A
(c) if A is incorrect but R is correct
(d) if A is correct but R is incorrect
3228: Which of the following places have their standard times, that are the same as GMT?
I. Accra
II. Dublin
III. Madrid
IV. Lisbon
Choose the correct answer from the codes given below:
(a) I, II and III
(b) I, III and IV
(c) I, II and IV
(d) II, III and IV
3229: On which of the following can you find the Bureau of Energy Efficiency Star Label?
1. Ceiling fans
2. Electric geysers
3. Tubular fluorescent lamps
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
3230: In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the
1. decomposer microorganisms to the surface.
2. nutrients to the surface.
3. bottom-dwelling organisms to the surface.
Which of the statements given above is/are correct ?
(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only