Life Processes in Plants Class 7 MCQ
hardLife Processes in Plants Class 7 MCQ
Life Processes in Plants Class 7 MCQ
Question 1.
What is the process by which plants synthesize food using sunlight?
(a) Respiration
(b) Photosynthesis
(c) Transpiration
(d) Fermentation
Answer:
(b) Photosynthesis
Question 2.
Which part of the plant is primarily responsible for photosynthesis?
(a) Roots
(b) Stem
(c) Leaves
(d) Flowers
Answer:
(c) Leaves
Question 3.
What gas do plants take in during photosynthesis?
(a) Oxygen
(b) Nitrogen
(c) Carbon Dioxide
(d) Hydrogen
Answer:
(c) Carbon Dioxide
Question 4.
Which of the following is NOT a product of photosynthesis?
(a) Glucose
(b) Oxygen
(c) Carbon Dioxide
(d) Water
Answer:
(c) Carbon Dioxide
Question 5.
What is the main function of xylem in plants?
(a) Transporting food
(b) Transporting water and minerals
(c) Storing food
(d) Photosynthesis
Answer:
(b) Transporting water and minerals
Question 6.
During respiration, when glucose is broken down, which of the following is NOT released?
(a) Oxygen
(b) Carbon Dioxide
(c) Water
(d) Energy
Answer:
(a) Oxygen
Case Study
I. Photosynthesis: The process of food production
Photosynthesis is a vital process in which plants synthesise food using sunlight, carbon dioxide, and water. This occurs primarily in the leaves, which act as the 'food factories' of the plant. Chlorophyll, the green pigment in leaves, captures sunlight, enabling the conversion of carbon dioxide and water into glucose and oxygen. The overall word equation for photosynthesis can be summarised as:
Sunlight + Carbon dioxide + Water (in presence of chlorophyll) → Glucose + Oxygen
This glucose serves as an immediate energy source for the plant and can be converted into starch for later use. The oxygen produced is released into the atmosphere, supporting life on Earth.
Question 1.
What is the role of chlorophyll in photosynthesis?
(a) Absorbs water from the soil
(b) Releases oxygen into the air
(c) Captures sunlight for the process
(d) Converts glucose into starch
Answer:
(c) Captures sunlight for the process
Question 2.
Which of the following is NOT required for photosynthesis to occur?
(a) Sunlight
(b) Oxygen
(c) Carbon dioxide
(d) Water
Answer:
(b) Oxygen
Question 3.
Photosynthesis primarily occurs in the ............, which act as the food factories of the plant.
Answer:
leaves
Question 4.
The glucose produced during photosynthesis can be converted into ............for later use.
Answer:
starch
Question 5.
Oxygen is consumed during photosynthesis. (True/False)
Answer:
False (Oxygen is actually produced and released into the atmosphere)
II. Respiration: Energy release in plants
Respiration is the process by which plants break down glucose to release energy, essential for growth and development. Unlike photosynthesis, which occurs in the presence of sunlight, respiration takes place continuously, both day and night. During this process; plants utilize oxygen and release carbon dioxide, which can be summarized in the following equation:
Glucose + Oxygen → Carbon dioxide + Water + Energy
This energy is crucial for various metabolic activities, including nutrient transport and cellular repair. The balance between photosynthesis and respiration is essential for maintaining ecological equilibrium, as both processes support life by cycling oxygen and carbon dioxide in the environment.
Question 1.
When does respiration in plants occur?
Answer:
Respiration in plants occurs continuously, both day and night.
Question 2.
What is released during plant respiration besides carbon dioxide and water?
Answer:
Energy is released during respiration in addition to carbon dioxide and water.
Question 3.
Why is the balance between photosynthesis and respiration important for ecological equilibrium?
Answer:
The balance between photosynthesis and respiration ensures the cycling of oxygen and carbon dioxide in the environment. This supports life by maintaining the gases plants and animals need to survive.