biology MCQs – Page 40

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 Review each marked answer and report any item that may be outdated or unclear.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
781. Photosynthesis carried out by terrestrial plants is _________ of total photosynthesis?
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A. 1-2%

B. 5%

C. 20%

D. 10%
782. Carotenoids perform protective function in_____________?
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A. Animals

B. Plants

C. Both of these

D. None of these

783. Microscopic gaps between the neuron endings are called__________?
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A. Transmitters

B. Nodes

C. Pores

D. Synapses
784. Which of the following are responsible for the detection of changes in environment?
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A. Effectors

B. Neurons

C. All of these

D. Receptors
785. The part of sporophyte which is called sporangium is____________?
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A. Stalk

B. None of these

C. Capsule

D. Foot

786. An increrase in plant girth due to activity of _____________ is called secondary growth?
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A. Cork cambium

B. Pith.

C. Vascular cambium.

D. Both a and c
787. Which of the following cytoplasmic extensions carry the message toward the cell body___________?
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A. Dendrites

B. Axon

C. Both of these

D. none of these

788. Which of the light is mainly absorbed by the plants?
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A. Orange

B. Red

C. Green

D. Both A and B
789. Which of the following statement about fatigue is correct?
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A. The major event in it is accumulation of lactic acid.

B. All of these

C. Ionic imbalance may also cause it.

D. Lactic acid accumulation turns pH in acidic range leading to muscle ache.

790. Which of the following is a compensation point:
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A. Leaves respire and utilize O2 and release CO2.

B. Rate of respiration becomes more than rate of photosynthesis.

C. Photosynthesis and respiration occur at same rate. So there is not net exchange of gases between atmosphere and plants.

D. Rate of photosynthesis increases, so do the O2 production, with a net release of oxygen coupled with the uptake of CO2.

791. In term of spore production Selaginella is characterized by________________?
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A. Homosporous

B. Hetrosporous

C. Both depending upon the conditions

D. None of these

792. Net yield of H2O in Photosynthesis is__________?
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A. 0 molecule

B. 6 molecules

C. 1 molecule

D. 3 molecules

793. At which times there is no net gaseous exchange between leaves and the atmosphere.
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A. Mid night.

B. Dawn & Dusk.

C. Day time.

D. Night time.

794. Which of the following statement is incorrect regarding the locomotion in Euglena?
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A. Myonemes can change the direction of the body by making it to shorten from anterior to the posterior pole.

B. Flagellum whipping backwards moving the organism forward, and when moves forward the organism moves backward.

C. Move with the help of flagellum, attached to the anterior pole of the body.

D. None of these

795. Microspore of a seed plant that contain male gametophyte including the gamete is called_______________?
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A. Ovule

B. Pollen grain

C. Microgametophyte

D. Microsporangium

796. The only promoter of leaf senescence in the following plant hormones is________________?
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A. Abscisic Acid

B. Auxins

C. Cytokinins

D. Gibberellins

797. Which type of sensory structures carry deep pressure and vibration sensations______________?
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A. none of these

B. Pacinian corpuscles

C. Hair end organs

D. Meissners Corpuscles

798. There are _________ stomata per square cm of leaf surface in Tobacco plants?
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A. 1000

B. 1200

C. 12000

D. 100,000
799. MSH is produced from___________?
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A. None of these

B. Posterior pituitary

C. Median pituitary

D. Anterior pituitary

800. Tetany is caused by__________?
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A. Clostridum tetani.

B. Hypocalcemia

C. Low O2 level

D. Hypercalcemia