Which one of the following depresses brain activity and produces feelings of calmness, relaxation, and drowsiness?
 In India, cluster bean [Guar] is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which one of the following statements is correct in this context?
[A] The oil extracted from seeds is used in the manufacture of biodegradable plastics
[B] The gum made from its seeds is used in the extraction of shale gas
[C] The leaf extract of this plant has the properties of anti-histamines
[D] It is a source of high-quality biodiesel
 Which one of the following is the correct sequence of a food chain?
 Which one of the following terms describes not only the physical space occupied by an organism but also its functional role in the community of organisms?
[B] Ecological niche
[D] Home range
 The increasing amount of carbon dioxide in the air is slowly raising the temperature of the atmosphere because it absorbs
[A] the water vapor of the air and retains its heat
[B] the UV part of the solar radiation
[C] all the solar radiations
[D] the infrared part of the solar radiation
 Which of the following is/are cited by the scientists as evidence/evidence for the continued expansion of the universe?
 Detection of microwaves in space
 Observation of the redshift phenomenon in space
 Movement of asteroids in space
 Occurrence of supernova explosions in space code
[A] 1 and 2 only
[B] 2 only
[C] 1, 3 and 4
[D] None of the above can be cited as evidence.
 A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is: Food crop – Rat – Snake-Hawk, in this food chain, the highest concentration of the pesticide would accumulate in which one of the following?
[A] Food crop
 If a potato is placed on a pure paper plate that is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:
[A] Potato is mainly made up of starch whereas paper is mainly made up of cellulose
[B] Potato transmits microwaves whereas paper reflects microwaves
[C] Potato contains water whereas paper does not contain water
[D] Potato is a fresh organic material whereas paper is a dead organic material
 With reference to the evolution of living organisms, which one of the following sequences is correct?
[B] Pangolin- Tortoise-Hawk
 Consider the following statements:
 An object must be at both foci of an elliptical orbit.
 All the planets move in their orbits at the same speed.
 All the planets revolve around the sun with the same period.
Which of the statements given above is/are incorrect?
[A] 1 and 3 only
[B] 1 and 2 only
[C] 2 and 3 only
[D] 1, 2 and 3