Biology

Photosynthesis in Plants

1,508 Questions

Photosynthesis is the biological process by which plants convert light energy into chemical energy. This page contains practice questions covering essential topics like chlorophyll, light reactions, and the pathways specific to plants. This material is crucial for medical entrance exams and academic assessments.

Chlorophyll and pigmentsLight reactionsCalvin cycleCAM plantsElectron transportPhotosynthesis factors

Photosynthesis in Plants Questions

Multiple choice

Photosystem II is found in

  1. grana of of chloroplast

  2. stroma of chloroplast

  3. matrix of chloroplast

  4. mitochondrial matrix

  5. cytochrome
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Grana represent the stack of thylakoids present in chloroplast.

Multiple choice

Consider the following facts:

  1. Chloroplast is an organelle which contains the green pigment called chlorophyll.
  2. Chlorophyll is involved in the formation of oxygen from carbon dioxide during photosynthesis.
  3. Chloroplast is also present in roots of plants.

Which of the given facts is/are incorrect?

  1. Only (2)

  2. Only (3)

  3. Only (2) and (3)

  4. Only (1) and (3)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

(1) Chloroplast is a plant cell organelle that contains the green coloured pigment called chlorophyll.

(2) Chlorophyll is a green pigment which helps the plant trap solar energy. This energy helps to convert carbon dioxide and water into oxygen. (3) Chloroplast is absent in root cells. The root cells contain chromoplast containing xanthophyll pigment.

Multiple choice

Why do leaves of plants appear green?

  1. Leaves absorb the green light, and reflect all the remaining six colours of sunlight.

  2. Leaves absorb all the six colours of sunlight, and reflect green colour.

  3. Leaves of a plant reflect sunlight.

  4. Leaves of a plant absorb sunlight.

  5. Roots absorb green material from the soil and accumulates them in leaves.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The colouring pigment, chlorophyll, present on the leaves absorbs all the six colours of sunlight and reflects green colour. This is why it appears green to us. 

Multiple choice

Which of the following statements is not true?

  1. C3 plants lack hatch slack pathway.

  2. C4 plants exhibit calvin cycle.

  3. C3 plants respire in the presence of light.

  4. C4 plants also show C2 cycle.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

No, C4 plants show C2 cycle as in C2 cycle, photorespiration occurs and the first stable compound formed is a two carbon compound, i.e. phosphoglycolate.

Multiple choice

Which cycle occurs in sugarcane?

  1. Hatch slack

  2. Calvin cycle

  3. Photorespiration

  4. C2 cycle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a C4 plant. Hence, it follows the 'hatch slack' pathway.

Multiple choice

What do green plants release during night?

  1. Oxygen

  2. Carbon dioxide

  3. Carbon monoxide

  4. Nitrogen dioxide

  5. Ozone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide is a by-product of respiration, which is carried out by all organisms all the time, even at night.