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

Match the following:

Column I Column II
A. Chloroplast 1. Imparting attractive colours to flowers and fruits
B. Chromoplast 2. Storage of starch, oil and proteins
C. Leucoplast 3. Involvement in photosynthesis

  1. A - 1, B - 2, C - 3

  2. A - 2, B - 3, C - 1

  3. A - 3, B - 1, C - 2

  4. A - 3, B - 2, C - 1

  5. A - 2, B - 3, C - 1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All are correctly matched.   Chloroplast : Involvement in photosynthesis Chromoplast : Imparting attractive colours to flowers and fruits Leucoplast : Storage of starch, oil and proteins

Multiple choice

Which of the following statements is/are false regarding bacterial photosynthesis?

  1. Bacteriochlorophyll absorbs in the range of 650-750 nm.
  2. Water acts as photosynthetic electron donour.
  3. Non-cyclic photophosphorylation is absent.

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bacteriochlorophyll absorbs in the range of 800-1000 nm. H2S, other sulfur compounds or certain organic compounds act as photosynthetic electron donour in bacterial photosynthesis.

Multiple choice

Which statement about photomorphogenesis is false?

  1. It involves the protein pigment phytochrome.

  2. It is only important at the seedling stage of plant development.

  3. It is affected by red, far-red and blue light.

  4. It can be defined as light-dependent changes in plant growth and development.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Photomorphogenesis is light-dependent development in plants throughout the life cycle, not just at seedling stage. Phytochrome is the key pigment involved (A is true). Red, far-red, and blue light all affect photomorphogenesis (C is true). D correctly defines it. B is FALSE because photomorphogenesis continues throughout plant life - affecting flowering, shade avoidance, circadian rhythms, and other developmental processes in adult plants.

Multiple choice

In the experiment of photosynthesis, the isotope used by Calvin was

  1. O18

  2. C14

  3. C11

  4. N14
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melvin Calvin used radioactive Carbon-14 (C14) isotopes to trace the path of carbon in photosynthesis, leading to the discovery of the Calvin cycle. This work earned him the Nobel Prize in Chemistry in 1961. O18 is used in other photosynthesis experiments involving water splitting.

Multiple choice

The first acceptor of carbon dioxide in C4 plant is

  1. malic acid

  2. aspartic acid

  3. oxaloacetic acid

  4. phosphoenol pyruvic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In C4 plants, CO2 is first accepted in mesophyll cell by phosphenol pyruvic acid, a 3-carbon compound and forms 4-carbon compound known as oxaloacetic acid.