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

Which part of a desert plant carries out the process of photosynthesis?

  1. Leaf (spine-like)

  2. Stem

  3. Flower

  4. Root
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Desert plants have leaves reduced to spines to prevent the excess loss of water by transpiration. So, the function of photosynthesis in them is taken up by the stem. Flower is the reproductive organ of the plant and roots, being underground, cannot receive sunlight and thus, cannot perform photosynthesis.

Multiple choice

C4 plants differ from C3 plant with respect to the

  1. number of ATP molecules consumed

  2. leaves have Krans anatomy

  3. substrate which accepts carbon dioxide

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The C4 plants often possess a characteristic leaf anatomy called Kranz anatomy. The primary function of Kranz anatomy is to provide a site in which CO2 can be concentrated around RuBisCO, thereby avoiding photorespiration.

Multiple choice

The yellow, red or orange pigments of green plants are called

  1. chlorophyll

  2. leucophyll

  3. xanthophyll

  4. erythrophyll
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Xanthophylls are yellow, orange, and red pigments belonging to the carotenoid family. They become visible when chlorophyll degrades (autumn leaf color). Chlorophyll is green. 'Leucophyll' is not a standard term - white pigments are typically chromoplasts without pigment. Erythrophyll is not standard botanical terminology.

Multiple choice

Identify the false statements.

  1. Ubiquinones are non-protein electron carriers located in the inner mitochondrial membrane.
  2. Entner–Doudoroff pathway occurs both in prokaryotes as well as eukaryotes.
  3. Non-cyclic photophosphorylation is absent in bacterial photosynthesis.
  4. Bacteriochlorophyll absorbs in the range of 250-500 nm.

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Both are false statements.Entner–Doudoroff pathway occurs only in prokaryotes.Bacteriochlorophyll absorbs in the range of 670-1040 nm.

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.