Chapter Exam

Chapter 13: Earth as a System: Energy Matter and Life — Online MCQ Test

Q: Which sphere of Earth mainly consists of water bodies such as oceans, rivers, and lakes?

Answer: B. Hydrosphere — The hydrosphere includes all water present on Earth in liquid, solid, and gaseous forms. Oceans, rivers, lakes, and groundwater are part of it.

Q: Which gas is most abundant in the Earth’s atmosphere?

Answer: C. Nitrogen — Nitrogen makes up the largest portion of the atmosphere, about 78%. It is essential in the nitrogen cycle.

Q: Which process returns water vapour to liquid water in the water cycle?

Answer: B. Condensation — Condensation changes water vapour into tiny water droplets, forming clouds. It is an important step in the water cycle.

SCIENCE · Grade 9 · CBSE(NCERT)

Practice Chapter 13: Earth as a System: Energy Matter and Life with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 9 SCIENCE. This chapter covers: Geosphere Hydrosphere Atmosphere Biosphere Cryosphere Water Cycle Carbon Cycle Nitrogen Cycle Solar Energy Ecosystem Sustainability Understanding Earth as an interconnected system.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 13: Earth as a System: Energy Matter and Life — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 9 SCIENCE — Chapter 13: Earth as a System: Energy Matter and Life, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which sphere of Earth mainly consists of water bodies such as oceans, rivers, and lakes?

A. Geosphere
B. Hydrosphere ✓
C. Atmosphere
D. Biosphere

Answer: B. Hydrosphere
The hydrosphere includes all water present on Earth in liquid, solid, and gaseous forms. Oceans, rivers, lakes, and groundwater are part of it.

Which gas is most abundant in the Earth’s atmosphere?

A. Oxygen
B. Carbon dioxide
C. Nitrogen ✓
D. Argon

Answer: C. Nitrogen
Nitrogen makes up the largest portion of the atmosphere, about 78%. It is essential in the nitrogen cycle.

Which process returns water vapour to liquid water in the water cycle?

A. Evaporation
B. Condensation ✓
C. Transpiration
D. Runoff

Answer: B. Condensation
Condensation changes water vapour into tiny water droplets, forming clouds. It is an important step in the water cycle.

Which of the following shows the best example of an interconnected Earth system?

A. A rock remaining unchanged for years
B. Rainfall supporting plant growth, which supports herbivores, which support carnivores ✓
C. A volcano with no effect on nearby life
D. Only the atmosphere changing every day

Answer: B. Rainfall supporting plant growth, which supports herbivores, which support carnivores
Rainfall affects plants, plants support herbivores, and herbivores support carnivores. This shows how water, life, and energy are linked in Earth systems.

A student says: 'All energy used by living organisms on Earth originally comes from the Sun.' Which statement best supports this?

A. Only animals use solar energy directly
B. Plants capture solar energy through photosynthesis, and this energy passes through food chains ✓
C. Solar energy is stored only in oceans
D. The Sun directly provides food to all organisms

Answer: B. Plants capture solar energy through photosynthesis, and this energy passes through food chains
Plants are the primary source of food energy because they capture sunlight and convert it into chemical energy. This energy then moves through ecosystems via food chains.