Chapter 25: Life Processes: Nutrition, Transportation, Respiration, Excretion – Important MCQs
- Which of the following is the ultimate source of energy for all living organisms?
A. Moon
B. Earth
C. Sun
D. Water
✔️ Answer: C. Sun - In which part of the human body does digestion of protein begin?
A. Mouth
B. Stomach
C. Small intestine
D. Large intestine
✔️ Answer: B. Stomach - Which enzyme is present in saliva?
A. Pepsin
B. Amylase
C. Trypsin
D. Lipase
✔️ Answer: B. Amylase - Which blood vessels carry blood away from the heart?
A. Veins
B. Capillaries
C. Arteries
D. None of these
✔️ Answer: C. Arteries - What is the respiratory pigment in humans?
A. Chlorophyll
B. Hemoglobin
C. Myoglobin
D. Carotene
✔️ Answer: B. Hemoglobin - Which gas is released during respiration in plants?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
✔️ Answer: B. Carbon dioxide - Excretory unit of the kidney is called:
A. Neuron
B. Nephron
C. Alveoli
D. Villus
✔️ Answer: B. Nephron - The process by which green plants make their food is:
A. Respiration
B. Photosynthesis
C. Transpiration
D. Digestion
✔️ Answer: B. Photosynthesis - Which of the following organisms respires through skin?
A. Human
B. Frog
C. Fish
D. Insects
✔️ Answer: B. Frog - Which part of the human heart pumps oxygenated blood to the body?
A. Right atrium
B. Right ventricle
C. Left ventricle
D. Left atrium
✔️ Answer: C. Left ventricle
