Biology

Photosynthesis in Plants

1,492 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

Protochlorophyll varies from chlorophyll in lacking

  1. 4 H atoms in 1 of its pyrrole ring

  2. 4 H atoms in 2 of its pyrrole ring

  3. 2 H atoms in 1 of its pyrrole ring

  4. 2 H atoms in 2 of its pyrrole ring
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Protohrolphyll is grenn Mg containing pigment which is found in etiolated leaves. Chlorophyll is green pigment present in Cyanobacteria & chloroplast of plants. Protochlorophyll varies from chlorophyll in lacking 2 H atoms in 1 of its pyrrole ring

Multiple choice

What happens in the process of photosynthesis?

  1. Solar energy is converted into heat energy.

  2. Chemical energy is converted into solar energy.

  3. Solar energy is converted into electrical energy.

  4. Solar energy is converted into chemical energy.

  5. Solar energy is converted into mechanical energy.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the process of photosynthesis, the solar energy is converted into chemical energy.

Multiple choice

Which plastid can control the dismantling of photosynthetic apparatus during senescence?

  1. Chloroplast

  2. Chromoplast

  3. Gerontoplast

  4. Leucoplast

  5. Amyloplast
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A gerontoplast is a plastid found in formerly green tissues that are currently senescing. The function of the gerontoplast in association with other organelles in an aging cell is clearly to affect a controlled dismantling of the photosynthetic apparatus during senescence. 

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.