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

Chloroplast cannot arise from

  1. pre existing chloroplast

  2. proplastids

  3. leucoplasts

  4. mitochondria

  5. both proplastids and leucoplasts
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chloroplast cannot arise from mitochondria. So, this is right answer.

Multiple choice

The plastids are green due to the presence of

  1. chlorophyll

  2. haemocyanin

  3. carotenoids

  4. haemoglobin

  5. both chlorophylls and haemocynin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The plastids are green due to the presence of carotenoids. So, this answer is right.

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.