Questions

Why do the plant closes stomata when it does NOT need carbon dioxide for photosynthesis?

Acceleration due to gravity on a planet decreases with ______.

Propagation of sound can be visualised as propagation of _____________ variations in the medium.

A body has a weight W on the surface of Earth. What is its weight on a planet whose mass is 15 times that of Earth and a radius that is 4 times that of the earth?

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

He was smiling, (A)/ but his eyes retained (B)/ a look of solemness.(C)/ No error (D)

Who discovered Nitrogen?

In the following items, each passage consists of six sentences. The first and the sixth sentence are given in the beginning as S1 and S6. The middle four sentences in each have been removed and jumbled up. These are labeled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark your response accordingly on the Answer Sheet.

S1 :There is no doubt that the rules governing imports, manufacture and the use of pesticides need to be further tightened up.
S6:At the same time, better pollution control measures are needed to check the discharge of poisonous gases and chemicals by a host of other industries which are equally responsible for poisoning our world.
P:But a more practical and feasible approach is required to tackle this problem.
Q:No one can deny the importance of pesticides in our agriculture.
R:The proposed amendment is an attempt at doing this, but in the process it seems to have gone overboard in most cases.
S:Even today, nearly a fourth of our crop is lost due to pests and weeds.

The proper sequence should be 

Which component in tobacco makes it harmful for human consumption?