Skip to content
GK24
Prime
General ScienceEasyAsked in: NDA · NDA-I 2021, GAT

The gaseous product of a process in plants is a requirement for another vital process that releases energy. Given below are four combinations of the process and product. Identify the correct answer.

  1. A.Respiration and Nitric oxide
  2. B.Transpiration and Water vapour
  3. C.Photosynthesis and Oxygen
  4. D.Germination and Carbon dioxide

Correct answer

C. Photosynthesis and Oxygen

Explanation

The correct answer is C, Photosynthesis and Oxygen. Photosynthesis gives off oxygen, and oxygen is what aerobic respiration needs to release energy from food.

In photosynthesis, green plants use sunlight, carbon dioxide and water to make glucose, and release oxygen, which comes from the splitting of water. In aerobic respiration, glucose is oxidised with oxygen to give carbon dioxide, water and energy stored as ATP. The two processes are mirror images: the gas one gives out is the gas the other takes in, which keeps oxygen and carbon dioxide in balance.

A is wrong because respiration does not give nitric oxide, and nitric oxide does not drive any energy-releasing process.

B is wrong because water vapour from transpiration is not a requirement for respiration.

D is wrong because carbon dioxide is a product of germinating seeds' respiration, and it is used in photosynthesis, which stores energy rather than releasing it.

Exam tip: photosynthesis stores energy and gives O2; respiration releases energy and uses O2.

Practice Questions

View all
Q1.General ScienceAsked in: UPSC Civil Services · CSE Prelims 2022, GS Paper IMedium

Which of the following are nitrogen-fixing plants?

1. Alfalfa

2. Amaranth

3. Chickpea

4. Clover

5. Purslane (Kulfa)

6. Spinach

Select the correct answer using the code given below:

  1. A.1, 3 and 4 only
  2. B.1, 3, 5 and 6 only
  3. C.2, 4, 5 and 6 only
  4. D.1, 2, 4, 5 and 6
Show answer
Correct answer: A. 1, 3 and 4 only

Alfalfa, chickpea and clover are legumes, and legumes fix nitrogen. Plants of the legume family (Fabaceae) carry root nodules that house Rhizobium bacteria.

Q2.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

The mass number of an element is NOT changed when it emits

  1. A.Alpha and Beta radiations only
  2. B.Alpha and Gamma radiations only
  3. C.Beta and Gamma radiations only
  4. D.Alpha, Beta and Gamma radiations
Show answer
Correct answer: C. Beta and Gamma radiations only

Neither beta nor gamma emission changes the total number of protons and neutrons in a nucleus, so the mass number stays the same.

Q3.General ScienceAsked in: UPSC CAPF · CAPF 2025, Paper IMedium

Which one among the following statements about facilitated transport in plants is correct?

  1. A.All passive transports are types of facilitated transport.
  2. B.Facilitated transport is an example of active transport.
  3. C.Water moves across plasma membrane by active transport.
  4. D.Facilitated transport requires assistance of carrier proteins.
Show answer
Correct answer: D. Facilitated transport requires assistance of carrier proteins.

In facilitated transport, molecules cross the membrane with the help of membrane proteins, while still moving down their concentration gradient.

Q4.General ScienceAsked in: UPSC CAPF · CAPF 2017, Paper IMedium

Who among the following has coined the term 'Quark', the fundamental particles that make up protons and neutrons in an atomic nucleus ?

  1. A.Richard Feynman
  2. B.Murray Gell-Mann
  3. C.Albert Einstein
  4. D.Niels Bohr
Show answer
Correct answer: B. Murray Gell-Mann

The American physicist Murray Gell-Mann proposed quarks in 1964 and gave them their name. Gell-Mann, and independently George Zweig, suggested that protons, neutrons and other such particles are built from smaller units.