Biology MCQs

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Asthama is not a sex linked character whereas colorblindness and baldness are sex linked. Colour blindness usually involves the inability to distinguish between shades of the colours red and green.

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Thrombin is a naturally occurring enzyme that converts fibrinogen into fibrin, which is an integral step in clot formation. Ca2+ is essential for both activation and action of thrombin.

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Raphanus sativus is Radish. The Edible parts are roots, but Radish leaves and seedpods which are fruits are also edible.

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Made up of 47 million nucleotides, Chromosome 21 is the smallest Human Chromosome.

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Overdose of antibiotics will cause the suppression of synthesis biotin in human body. Biotin is also known as vitamin H, vitamin B₇ or vitamin B₈ and is involved in a wide range of metabolic processes, primarily related to the utilization of fats, carbohydrates, and amino acids.

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Pigeons have become useful bioindicators for lead pollution due to their widespread presence in cities and their ability to accumulate and retain heavy metals, including lead, in their tissues. Researchers have found that the feathers, blood, and tissues of pigeons can provide valuable information about the levels of lead exposure in the environment.

Lead pollution in cities can come from various sources, including lead-based paints, industrial emissions, and traffic-related sources. Pigeons, being urban birds, are exposed to these sources and can accumulate lead over time. By studying lead levels in pigeon populations, scientists can gain insights into the extent of lead pollution in a city and assess its potential risks to both wildlife and humans.

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Bulbil, also called bulblet, in botany, is a tiny secondary bulb that forms in the angle between a leaf and stem or in place of flowers on certain plants for vegetative reproduction. Bulbils, called offsets when full-sized, fall or are removed and planted to produce new plants.

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The primary route in which the body eliminates substances is through the kidneys. The main function of the kidney is the excretion of body wastes and harmful chemicals into the urine.

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Vitamin B9 is also called as the folic acid. Folic acid is converted into folate in the human body. Folate is essential for making DNA and RNA.
Extra info: Folic acid /B9 is recommended to the pregnants to reduce the risk of Neural Tube Defects in the foetus.

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Germ-plasm theory, the concept of the physical basis of heredity, articulated by the 19th century biologist August Weismann.