biology MCQs – Page 48

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
941. The chlorophyll molecule is embedded in the core of thylakoid membrane which acts as___________?
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A. Hydrophilic

B. Hydrophobic

C. Both of these

D. None of these

942. Collagen fibers of bone are hardened by deposition of_____________?
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A. SiO2

B. CaSO4

C. CaCO3

D. Ca & PO4
943. In which of the following neurons length of dendrite is greater than axon_______________?
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A. Associative neuron

B. Motor neuron

C. none of these.

D. Sensory neuron
944. Molecular formula of chlorophyll b is_____________?
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A. C55 H71 O6 N4 Mg

B. C55 H70 O6 N4 Mg

C. C55 H70 O6 N5 Mg

D. C55 H10 O4 N6 Mg

945. Which of the following muscle is an antagonistic member of Biceps brachii?
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A. Intercostals

B. Bracheoradialis

C. Triceps

D. Brachialis.

946. The glycolate produced diffuses into the membrane bounded organelles called____________?
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A. Lysosomes

B. Glyoxisomes

C. Mitochondria

D. Peroxisomes
947. Xanthophylls are _________ pigments
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A. Yellow

B. Green

C. Red

D. Orange

948. Which of the following statements about fractures in old age is incorrect?
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A. They are more common than in adult age.

B. Occur as a result of bone being thin and weak.

C. Due to good blood supply it results in quick healing.

D. It involves osteoblasts and osteocytes.

949. Of the following, which one causes higher production of food in green plants?
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A. Orange

B. Violet

C. Blue

D. Red
950. The increase in pH of blood has ________ effect on the oxygen carrying capacity of haemogolobin?
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A. ve

B. No

C. plus ve

D. All of these

951. How many vertebrae are present in thoracic region?
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A. 4

B. 5

C. 7

D. 12
952. Normal resting membrane potential of a neuron is_____________?
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A. 80 mv

B. 60 mv

C. 50 mv

D. 70 mv
953. A fracture hematoma has____________?
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A. Destructive properties.

B. Healing properties.

C. Dead cells

D. Neutralizing properties.

954. Stem of Psilophyton an example of psilogsida is differentiated into an underground rhizome and an aerial part both of which are _________ branched
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A. Dichotomously

B. Isotomous

C. Trichotomously

D. Multichotomously

955. Photosystem II has molecules which absorbs maximum light of___________?
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A. 680 nm

B. 700 nm

C. 100 m

D. 670 nm

956. From one pyruvate passing through Krebs cycle, how many NADH are formed?
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A. 3

B. 2

C. 1

D. 4

957. Nissls granules are present in which part of the neuron_________________?
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A. Myelin sheath

B. Dendrite

C. Axoplasm

D. Soma
958. The space between the overtopped dichotomous branches was occupies by a sheet of _________ cells during evolution of megaphyllas?
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A. Collenchyma

B. Sclerenchyma

C. Parenchyma

D. Chlorenchyma
959. Which of the following kidney stones are most common?
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A. Calcium oxalate

B. All of these

C. Uric acid

D. Calcium phosphate

960. Protein which acts as hormone is__________?
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A. Casein

B. Oxytocin

C. Trypsin

D. Keratin