Question

Match the column.

	List I		List II
1	Emerson effect	a	$C_4$cycle
2	Hill reaction	b	Photolysis
3	Calvin cycle	c	$C_3$cycle
4	Hatch and Slack cycle	d	Photosystem- I and II

• A. 1- a, 2- b, 3- c, 4- d
• B. 1- a, 2- c, 3- d, 4- b
• C. 1- c, 2- d, 3- a, 4- b
• D. 1- d, 2- b, 3- c, 4- a

Answer 1

The correct option is D 1- d, 2- b, 3- c, 4- a

Emerson effect is also known as red drop effect. In this effect, a sharp reduction in rate of photosynthesis is found when monochromatic light of 680 nm is used. It occurs mainly due to the presence of two different pigment systems, i.e., PS I and PSII.

Hill reaction is also known as light reaction. It is one of the phases of photosynthesis. This phase involves two processes: photolysis of water and production of assimilatory power i.e., ATP and NADPH.

Calvin cycle is found in $C_3$ plants. That’s why it is also known as $C_3$ cycle. In this cycle, the first $C{O}_2$ fixation product was a three-carbon organic acid. It was 3-phosphoglyceric acid (PGA).

Hatch and slack pathway is found in $C_4$ plants, hence it is also known as $C_4$ cycle. The primary $C{O}_2$ acceptor is a three-carbon molecule phosphoenol pyruvate (PEP) and it is present in mesophyll cells.