Human Anatomy & Physiology – Nutrition, Digestion, Respiration, Locomotion, Excretion, Skin Quiz - ICSE Class 9 Biology
Free practice quiz: Human Anatomy & Physiology – Nutrition, Digestion, Respiration, Locomotion, Excretion, Skin (ICSE Class 9 Biology). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which enzyme, secreted by the pancreas, is primarily responsible for the breakdown of fats into fatty acids and glycerol?
- Amylase
- Pepsin
- Lipase
- Trypsin
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Answer: C. Lipase
Lipase is the enzyme that specifically digests fats (lipids). Amylase digests carbohydrates, pepsin digests proteins in the stomach, and trypsin digests proteins in the small intestine.
Bones are connected to muscles by:
- Ligaments
- Tendons
- Cartilage
- Synovial fluid
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Answer: B. Tendons
Tendons are tough, fibrous connective tissues that connect muscles to bones, enabling movement when muscles contract.
What is the primary component of sweat, besides water?
- Glucose
- Salts
- Proteins
- Lipids
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Answer: B. Salts
Sweat is primarily composed of water, but also contains electrolytes, mainly sodium chloride (salts), as well as small amounts of urea, lactic acid, and other waste products. Salts are lost in significant amounts through sweat.
The primary role of the large intestine in digestion is:
- Absorption of proteins and carbohydrates
- Production of digestive enzymes
- Absorption of water and electrolytes
- Emulsification of fats
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Answer: C. Absorption of water and electrolytes
While the small intestine absorbs most nutrients, the large intestine's primary function is to absorb water and electrolytes from the remaining indigestible food matter and transmit the useless waste material from the body.
Which part of the nephron is primarily responsible for reabsorbing most of the water and salts from the glomerular filtrate?
- Glomerulus
- Bowman's capsule
- Loop of Henle
- Distal convoluted tubule
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Answer: C. Loop of Henle
The Loop of Henle plays a crucial role in establishing a concentration gradient in the renal medulla, which is essential for the reabsorption of water and salts, particularly in the descending and ascending limbs.