Biology MCQs | Pak MCQs Biology With Answer | Part 48

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471. Why do we feel drowsy after a heavy meal?  

(a) The biological clock is upset  

(b) The body muscles are fatigued  

(c) The hypothalamus produces melatonin to induce sleep  

(d) The brain receives less oxygen as blood rushes to supply oxygen and nutrition to the contracting stomach and intestines  

The Answer is: (d) The brain receives less oxygen as blood rushes to supply oxygen and nutrition to the contracting stomach and intestines  

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472. Ready source of energy available for athletes is  

(a) Carbohydrates  

(b) Fats  

(c) Proteins  

(d) Vitamins  

The Answer is: (a) Carbohydrates  

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473. Chromosomes are:  

(a) Present only in the nucleus of a cell  

(b) The biggest in number in human cells  

(c) Made up of DNA as a main component  

(d) Visible in all cells at every time  

The Answer is: (c) Made up of DNA as a main component  

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474. The part of the cell which is essential for protein synthesis is:  

(a) Chloroplast  

(b) Ribosomes  

(c) Golgi bodies  

(d) Chromosomes  

The Answer is: (b) Ribosomes  

475. Short-sightedness is due to:  

(a) Shifting of the iris  

(b) Weaker muscles  

(c) Elongation of the eyeball  

(d) Corneal displacement  

The Answer is: (c) Elongation of the eyeball  

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475. Short-sightedness is due to:  

(a) Shifting of the iris  

(b) Weaker muscles  

(c) Elongation of eye balls  

(d) Weakening of the retina  

The Answer is: (c) Elongation of eye balls  

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476. There are approximately _____ muscles in the human body.  

(a) 200  

(b) 350  

(c) 500  

(d) 700  

The Answer is: (d) 700  

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477. The organ which destroys worn out RBCs in the body of a vertebrate is:  

(a) Pancreas  

(b) Liver  

(c) Bone marrow  

(d) Spleen  

The Answer is: (d) Spleen  

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478. The saliva helps in the digestion of:  

(a) Proteins  

(b) Fats  

(c) Fibres  

(d) Starch  

The Answer is: (d) Starch  

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479. Biological death of a patient means death of tissues of the:  

(a) Kidney  

(b) Heart  

(c) Lungs  

(d) Brain  

The Answer is: (d) Brain  

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480. Which of the following hormones contains iodine?  

(a) Adrenaline  

(b) Insulin  

(c) Testosterone  

(d) Thyroxine  

The Answer is: (d) Thyroxine  

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