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
  1. Green sulphur bacteria

  2. Purple bacteria

  3. Acidobacteria

  4. Heliobacteria

  5. All of the above

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Anoxygenic photosynthesis is the phototrophic process where light energy is captured and converted to ATP, without the production of oxygen. Water is therefore not used as an electron donor. Green sulfur bacteria, green and red filamentous anoxygenic phototrophs (FAPs), phototrophic purple bacteria, phototrophic Acidobacteria, and phototrophic heliobacteria perform Anoxygenic photosynthesis.

Multiple choice
  1. Ferredoxin is an electron carrier in ETC

  2. Plastocyanin is an insoluble protein

  3. Chlorophyll a0 is an early electron acceptor

  4. QK-A is an early electron acceptor

  5. MGDG II is a lipid

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plastocyanin is a soluble protein.

Multiple choice
  1. Mesophyll cells are rich in RuBisCO enzyme.

  2. Bundle sheath cells lack RuBisCO enzyme.

  3. Aspartic acid formed in bundle sheath cells is transported to mesophyll cells.

  4. CO2 is released in bundle sheath cells.

  5. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the bundle sheath cells these C4 acids are broken down  to release CO2 and a 3-carbon molecule.

Multiple choice
  1. haemoglobin

  2. chlorophyll

  3. carotene

  4. xanthophyll

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorophyll is the primary pigment in photosynthesis that absorbs light energy (mainly blue and red wavelengths). Carotene and xanthophyll are accessory pigments, while haemoglobin transports oxygen in blood.

Multiple choice
  1. root hairs

  2. flowers

  3. stem

  4. stomata

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stomata are tiny pores primarily located on the undersides of leaves that allow gas exchange. Carbon dioxide enters the leaf through these openings to reach the mesophyll cells where photosynthesis occurs. Root hairs absorb water and minerals, while the stem provides structural support and transport.

Multiple choice
  1. Glucose

  2. Fructose

  3. Starch

  4. Fats

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants convert glucose produced during photosynthesis into starch for storage in leaves. Starch is insoluble and compact, making it ideal for storage without affecting osmotic pressure. Glucose and fructose are simple sugars used directly for energy or transport.

Multiple choice
  1. Water

  2. Oxygen

  3. Carbon dioxide

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water is the only substance that appears in both photosynthesis (as a reactant) and respiration (as a product). In photosynthesis: 6CO2 + 6H2O → glucose + 6O2. In respiration: glucose + 6O2 → 6CO2 + 6H2O. Oxygen is only produced in photosynthesis, CO2 only in respiration.

Multiple choice
  1. chlorophyll a and d

  2. chlorophyll a and b

  3. chlorophyll b and c

  4. chlorophyll a and c

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Brown algae (Phaeophyta) contain chlorophyll a and c, along with fucoxanthin pigment which gives them their characteristic brown color. Chlorophyll b is found in green algae and land plants, while chlorophyll d is found in some cyanobacteria. The distinctive brown color comes from fucoxanthin masking the green chlorophyll.

Multiple choice
  1. All plants prepare their food by photosynthesis.

  2. Cells containing chloroplast carry out photosynthesis.

  3. In a green plant, all the organs, tissues and cells prepare their own food.

  4. Cynobacteria do not carry out photosynthesis.

  5. The end product of photosynthesis is glucose.

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is the correct answer. In green plants, not all the cells, tissues and organs carry out photosynthesis, but only the cells containing chloroplasts that are most often located in the superficial layers, carry out photosynthesis.

Multiple choice
  1. grana.

  2. prenoid.

  3. stroma.

  4. both grana and stroma.

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 A granum (plural grana) is a stack of thylakoid discs.A thylakoid is a membrane-bound compartment inside chloroplasts.They are the site of the light-dependent reactions of photosynthesis. Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algaeThe stroma of a plant is the region outside of the thylakoid space; most of the enzymes essential in the process of photosynthesis are generally embedded in the stroma and in the thylakoid membranes.