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

Which of the following statements is/are false?

a. In autotrophic nutrition, inorganic material, i.e. food is made from inorganic materials like carbon dioxide and water by utilising the solar energy. b. The organisms which can make their own food from carbon dioxide and water are called autotrophs. c. The autotrophic organisms contain the green pigment called chlorophyll which is capable of trapping solar energy.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

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

This is the correct option as this statement is false. In autotrophic nutrition, organic material, i.e. food, and not inorganic material is made from inorganic materials like carbon dioxide and water by utilising the solar energy.

Multiple choice

Which of the following processes primarily occurs in photosynthesis?

  1. Carbon dioxide is reduced to carbohydrates.

  2. NADH is reduced to NAD.

  3. ATP is generated.

  4. Oxidative phosphorylation occurs.

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

The main feature of photosynthesis is the reduction of carbon dioxide to carbohydrates in the presence of light energy obtained by sunlight in green plants.

Multiple choice

Which of the following events does not occur during photosynthesis?

  1. Absorption of light energy by roots

  2. Conversion of light energy to chemical energy

  3. Splitting of water molecules into hydrogen and oxygen

  4. Reduction of carbon dioxide into carbohydrates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During photosynthesis, light energy is absorbed by chlorophyll which is present in the leaves of a plant.

Multiple choice

Which type of energy conversion takes place during photosynthesis?

  1. Solar energy to mechanical energy

  2. Solar energy to chemical energy

  3. Wind energy to chemical energy

  4. Chemical energy to mechanical energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During the process of photosynthesis, solar energy is converted into chemical energy and is stored as organic matter.

Multiple choice

The first step in the dark reaction of photosynthesis is

  1. formation of ATP

  2. ionisation of water

  3. attachment of CO2 to a pentose sugar

  4. excitement of an electron of chlorophyll by a photon of light
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The first step in the dark reaction of photosynthesis is carboxylation in which one molecule of CO2 combines with one molecule of ribulose 1, 5-biphosphate (RuBP) to form unstable six carbon compounds. Carboxylation of RuBP is catalysed by the enzyme RuBP carboxylase or Rubisco.

Multiple choice

Which of the following statements about dark reaction are FALSE?

P. Source of energy for dark reaction is ATP synthesised in light reaction. Q. Raw materials of dark reaction are water, ADP and H3PO4. R. Oxygen is by-product of dark reaction and released to atmosphere. S. Dark reaction occurs in stroma of chloroplast.

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water, ADP and H3PO4 are raw materials for light reaction. Raw materials of dark reaction are CO2, NADPH2 and ATP. Oxygen is the by-product of light reaction and is released in the atmosphere.