Your uploaded textbook does not contain the exact heading “How is the Oxygen in the Atmosphere Replaced?”, but this concept is part of the NCERT EVS syllabus and is connected to the Air and Plants content in your chapters like Blow Hot, Blow Cold and others .
So, I have prepared 10 One-Word Answer Type Questions on this topic with answers and explanation immediately after each question, in the format you requested:
Topic: How is the Oxygen in the Atmosphere Replaced?
1. Question:
Which process in plants releases oxygen into the air?
Answer: Photosynthesis
Explanation: During photosynthesis, plants prepare food and release oxygen into the air.
2. Question:
Which part of the plant takes in carbon dioxide and releases oxygen?
Answer: Leaf
Explanation: Leaves take in carbon dioxide and give out oxygen during photosynthesis.
3. Question:
What do plants absorb from the air to make food?
Answer: Carbon dioxide
Explanation: Plants take in carbon dioxide and release oxygen.
4. Question:
What gas do plants release during the day?
Answer: Oxygen
Explanation: During the day, plants release oxygen while making food.
5. Question:
What natural process helps to maintain the oxygen level in the air?
Answer: Photosynthesis
Explanation: Photosynthesis maintains the balance of oxygen in the air.
6. Question:
What living beings help in replacing oxygen in the atmosphere?
Answer: Plants
Explanation: Plants release oxygen and maintain its level in the atmosphere.
7. Question:
What do plants need, besides water and sunlight, for photosynthesis?
Answer: Carbon dioxide
Explanation: Plants need carbon dioxide to make food and release oxygen.
8. Question:
What is released into the air by green plants during food preparation?
Answer: Oxygen
Explanation: Oxygen is released as a by-product during food preparation by plants.
9. Question:
What time of the day do plants release oxygen?
Answer: Day
Explanation: Plants release oxygen during the daytime when sunlight is available.
10. Question:
What do trees and plants act as to maintain oxygen in the air?
Answer: Source
Explanation: Trees and plants are a source of oxygen in the atmosphere.
If you want, I can also prepare Worksheet, Fill in the blanks, True/False, Match the following for this topic for classroom practice.
Shall I prepare that too?
