Autotrophic Nutrition MCQs:
1. Which of the following organisms are capable of autotrophic nutrition?
a) Plants
b) Animals
c) Fungi
d) Protozoa
Answer: a) Plants
2. The process by which plants convert sunlight into energy is known as:
a) Photosynthesis
b) Respiration
c) Digestion
d) Fermentation
Answer: a) Photosynthesis
3. Which of the following is not a requirement for photosynthesis?
a) Sunlight
b) Water
c) Oxygen
d) Carbon dioxide
Answer: c) Oxygen
4. The pigment responsible for capturing sunlight in plants is:
a) Chlorophyll
b) Melanin
c) Hemoglobin
d) Carotene
Answer: a) Chlorophyll
5. In photosynthesis, which organelle is responsible for the process?
a) Nucleus
b) Mitochondria
c) Chloroplast
d) Golgi apparatus
Answer: c) Chloroplast
6. The equation for photosynthesis is:
a) CO2 + H2O + sunlight → C6H12O6 + O2
b) CO2 + H2O → C6H12O6 + O2 + sunlight
c) C6H12O6 + O2 → CO2 + H2O + sunlight
d) C6H12O6 + O2 + sunlight → CO2 + H2O
Answer: a) CO2 + H2O + sunlight → C6H12O6 + O2
7. Which of the following is a product of photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Water
d) Glucose
Answer: d) Glucose
8. The process by which plants obtain nutrients from the soil is called:
a) Photosynthesis
b) Transpiration
c) Absorption
d) Respiration
Answer: c) Absorption
9. Which of the following is not a macronutrient required by plants?
a) Nitrogen
b) Phosphorus
c) Potassium
d) Iron
Answer: d) Iron
10. The process by which plants release excess water vapor through pores in their leaves is called:
a) Transpiration
b) Respiration
c) Photosynthesis
d) Absorption
Answer: a) Transpiration

Explanation:
Autotrophic nutrition is a mode of nutrition in which organisms can synthesize their own organic molecules from inorganic sources like sunlight, carbon dioxide, and water. Plants are classic examples of autotrophs that carry out photosynthesis to produce glucose, which serves as their primary source of energy. The process of photosynthesis occurs in the chloroplasts of plant cells, where chlorophyll captures sunlight to convert carbon dioxide and water into glucose and oxygen. This process not only provides energy for the plant but also releases oxygen into the atmosphere as a byproduct.
Plants also absorb essential nutrients from the soil through their roots to support growth and development. Macronutrients such as nitrogen, phosphorus, and potassium are crucial for plant health and productivity. Additionally, plants regulate water balance through transpiration, a process that helps in nutrient uptake and temperature regulation.
Overall, autotrophic nutrition plays a vital role in sustaining plant life and contributing