Q2 (CDS-II/2019) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Human anatomy physiology Answer Verified

Which one of the following is active transport?

It is the movement of a sub- stance against a diffusion gradient with the use of energy from respiration

It is the movement of a sub- stance against a diffusion gradient without the use of energy

It is the movement of a sub- stance against a diffusion gradient with the use of energy from photosynthesis

It is the movement of a sub- stance along a diffusion gradient with the use of energy from respiration.

Result

Your answer: — · Correct: A

Explanation

Active transport is the movement of substances across a cell membrane against a concentration or diffusion gradient, meaning from an area of lower concentration to higher concentration [4]. Unlike passive transport, which occurs along a gradient without energy expenditure, active transport requires free energy. This energy is primarily provided by ATP (adenosine triphosphate), which is known as the energy currency of the cell [2]. ATP is generated through the process of cellular respiration, where organic compounds like glucose are broken down to release energy [3]. This energy-driven mechanism allows cells to maintain essential internal concentrations of ions and molecules despite passive movements. While photosynthesis produces glucose, the immediate energy used for cellular work, including active transport, is harvested from ATP produced during respiration [3]. Therefore, active transport involves moving substances against a gradient using energy derived from respiration.

Sources

[4] https://www.ncbi.nlm.nih.gov/books/NBK547718/
[2] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > ATP > p. 88
[1] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > What you have learnt > p. 99
[3] Science-Class VII . NCERT(Revised ed 2025) > Chapter 10: Life Processes in Plants > In a Nutshell > p. 150

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Which one of the following is active transport?

Explanation

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