set 2 MCQ Questions & Answers Detailed Explanation

Answer: (d)

Fungi include both unicellular and multicellular forms, with both asexually and sexually reproducing organisms. No fungal specie is autotroph.

TB is caused by Mycobacterium tuberculosis and Lyme disease is caused by bacterial species of Borrelia.

Answer: (d)

Melatonin is secreted by the pineal gland present between the cerebral hemispheres.

Melatonin concentration in blood follows a diurnal cycle, it rises in the evening and drops at noon. Melatonin lightens skin colour in certain animals and regulates the working of gonads.

Answer: (b)

Double fertilization means, a male gamete fused with egg and second male gamete fused with secondary nucleus.

Answer: (b)

Fermentation is the process of production of alcohol from plant or microbial sugar under controlled conditions, aerobic cellular respiration is oxidation of plant stored food to produce energy, anaerobic respiration is production of energy from plant food in absence of oxygen.

Answer: (a)

The junction between an axon and dendrite is known as a synapse through which nerve impulse is transmitted from one neuron to another.

A synapse consists of swelling at the end of nerve fibre called synaptic knob and a small synaptic vesicle containing neuro-transmitter–acetylcholine for the transmission of nerve impulse.

Answer: (a)