biology MCQs – Page 44

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 Review each marked answer and report any item that may be outdated or unclear.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
861. Which of the following ions are involved in the initiation of nerve impulse_______________?
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A. Fe

B. K+

C. none of these

D. Na+
862. Which of the following animal has a hydrostatic skeleton?
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A. Round worm

B. Pin worm

C. Tape worm

D. Earthworm
863. Which of the following plays the major role in providing support to young herbaceous parts of the plant?
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A. Living cells of epidermis with higher turgor pressure.

B. Collenchyma cells

C. Living cells of cortex and pith with higher turgor pressure.

D. All of these
864. Thylakoids in chloroplasts are stacked into___________?
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A. None of these

B. Nucleus

C. Stroma

D. Grana
865. Pinus Taxus and Picea belong to_________________?
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A. Spheospsida

B. Angiosperms

C. Gymnosperms

D. Filicineae

866. Which of the following cells are involved in soft callus formation?
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A. Onteocyte and osteoblast

B. Osteoclast and osteocyte

C. Fibroblast and osteoblast.

D. Osteoblast and osteoclast.

867. In all plants the major sites of phosynthesis are___________?
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A. Branches

B. Roots

C. Stems

D. Leaves respire and utilize O2 and release CO2.
868. In bryophytes fertilization takes place in___________?
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A. Antheridia

B. water

C. Ovule

D. Archegonia
869. At the induction of action potential opening of Na+ gate with influx of Na+ is a ___________ processes?
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A. Passive transport

B. Diffusion

C. Active transport

D. none of these

870. Sporangia of which of the following tracheopytes develop singly on the upper side of sporophylls which may or may not be arranged to form strobili_____________?
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A. Psilopsida

B. Sphenopsida

C. Prteropsida

D. Lycopsida
871. Gaseous exchange through the skin is known as ______________ respiration?
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A. Cutaneous

B. Cuticular

C. Pulmonary

D. Skin

872. Of the following which one is not an energy releasing process?
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A. Respiration

B. Photosynthesis

C. Krebs cycle

D. Glycolysis

873. Abscisic acid promotes flowering in short day plants and inhibits in long day plants, which of the following is antagonistic to abscisic acid in terms of flowering______________?
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A. Cytokinins

B. Gibberellins

C. Auxins

D. Ethene.

874. Which of the following plant group first formed true leaves________________?
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A. Sphenopsida

B. Pteropsida

C. Psilopsida

D. Lycopsida
875. Which of the following bone is not present in the hind-limb?
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A. Fibula

B. Tibia

C. Femur

D. Radius
876. A smallest contractile unit of muscle contraction called sarcomere is the area between two:
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A. A band

B. Z- Line

C. M- Line

D. H- zone

877. Of the following, which one is a contagious disease?
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A. Asthma

B. Emphysema

C. Lungs cancer

D. Tuberculosis
878. Types of behaviour enabling pillbugs to reach moist area is___________?
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A. Instinct

B. Kinesis

C. Learning

D. Taxes

879. Molecular formula of chlorophyll a molecule is___________?
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A. C55H72O5N4Mg

B. C55H70O6N4Mg

C. C50H72O6N4Mg

D. C55H70O5N4Mg

880. A joint formed between humerus, radius and ulna is an example of__________?
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A. Fibrous joint

B. Slightly movable joint.

C. Freely movable joint.

D. Immovable joint.