Biology MCQs

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Helophyte are those plants which are typical of marshy or lake-edge environments, in which the perennating organ lies in soil or mud below the water level, but the aerial shoots protrude above the water for air.

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Hodophobia is the fear of travel. It is also referred to as travel phobia or fear of travel. Acute anxiety which is provoked by travel can be treated with anti-anxiety medication.

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Mitochondrion carries on the process of cell respiration converting glucose to ATP energy the cell can use. An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner part being folded inwards to form layers.

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Withering is used to remove excess water from the leaves and allows a very slight amount of oxidation. The process is also important in promoting the breakdown of leaf proteins into free amino acids and increase the availability of freed caffeine, both which change the taste of the tea.

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Keratin is a group of fibrous proteins occurring in hair, feathers, hooves, and horns. Keratins have coiled polypeptide chains that combine to form supercoils of several polypeptides linked by disulphide bonds between adjacent cysteine amino acids.

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At least one of the spores develop into haploid female gametophytes thus making the ratio of functional and degenerate megaspores is 1:3. Out of the four, three megaspores degenrate.

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Rickets is a skeletal disorder that’s caused by a lack of vitamin D, calcium, or phosphate. These nutrients are important for the development of strong, healthy bones. People with rickets may have weak and soft bones, stunted growth, and, in severe cases, skeletal deformities.

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When compared to the mammals, birds are less sensitive to temporary deprivation of water, because the water requirement per unit weight is less in birds than in mammals.

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• The islets of Langerhans are a cluster of cells within the pancreas that are responsible for the production and release of hormones that regulate glucose levels.
• Growth hormone is also called somatotropin or human growth hormone, peptide hormone. It is secreted by the anterior lobe of the pituitary gland. It stimulates the growth of essentially all tissues of the body, including bone.
• Calcitonin is a hormone that is produced in humans by the parafollicular cells of the thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.
• Hormones secreted by the adrenal medulla are Epinephrine. Most people know epinephrine by its other name—adrenaline. This hormone rapidly responds to stress by increasing your heart rate and rushing blood to the muscles and brain.

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Pomology is a branch of botany that studies fruit and its cultivation.