CISCE Board - Class 4

Human Physiology & Ecosystems question bank (Science)

Practice 197 free CISCE Board - Class 4 Science - Human Physiology & Ecosystems questions with answers and step-by-step solutions.

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Q1.

Plant Life & Photosynthesis: In 'Human Digestive System and Dental Anatomy', what essential ingredients do green leaves utilize?

(A)
Sunlight, chlorophyll, carbon dioxide and water (Human Digestive System and Dental Anatomy)
(B)
Darkness and toxic pollutants
(C)
Pure nitrogen only
(D)
None of these
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Q2.

States of Matter & Simple Machines: What principle explains the operation of 'Human Digestive System and Dental Anatomy'?

(A)
Mechanical advantage of levers, pulleys or states of matter change (Human Digestive System and Dental Anatomy)
(B)
Perpetual motion creation
(C)
Elimination of all friction
(D)
None of these
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