science exploration class 9 exercise 13 solutions – Discussion Forum

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Piyush365

Asked: October 15, 2026In: Class 9 Science

Why is an excess of CO₂ in the atmosphere considered undesirable even though it is required by plants?

Excess carbon dioxide intensifies the greenhouse effect, driving global warming, polar ice melt and ocean acidification that degrades marine life, outweighing any potential photosynthetic benefits to plants. Class 9 Science Exploration Chapter 13 Important Questions SQP from Class 9 Science Chapter 13 ...

Piyush365

Asked: October 15, 2026In: Class 9 Science

Which of the following is primarily responsible for warming of the Earth? (i) Solar radiation is immediately absorbed by carbon dioxide, which then releases it as heat. (ii) The atmosphere’s tiny particles absorb incoming solar radiation, which directly heats the Earth. (iii) The Earth’s surface absorbs solar radiation, which is then re-radiated and trapped by greenhouse gases. (iv) The Earth’s environment is heated only by the solar radiation reflected by the clouds.

The correct option is (iii). Solar radiation penetrates the atmosphere and heats the ground, which then emits infrared radiation that is trapped by atmospheric greenhouse gases, sustaining global surface temperatures. CBSE Class 9 Science Chapter 13 Earth as a System: Energy, ...