Biology MCQs

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Rinderpest is a highly contagious viral disease of cattle. Rinderpest is an ancient plague of cattle and other large ruminants. It belongs to the Paramyxoviridae family.

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Hemophilia A is characterized by a deficiency of the anti-hemophilia globulin factor.

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In incomplete dominance, the phenotype of both alleles is partially expressed.

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An example of abiotic stress is drought. The negative effect of non-living factors on living organisms in a specific environment is known as abiotic stress.

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Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is considered a primary indicator when assessing the suitability of surface waters to support aquatic life. Dissolved oxygen can be measured in two ways: either in milligrams per litre (mg/L) or percent saturation (% sat). Water with an oxygen concentration of less than 3 mg/L will generally not support fish. When concentrations fall to about 3-4 mg/L, fish start gasping for air at the surface or huddle around the water fall (higher concentration points). Above 5 mg/L, almost all aquatic organisms can survive indefinitely, provided other environmental parameters are present within allowable limits.

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Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Used mostly in weapons and nuclear power plants, poisoning usually occurs through accidental ingestion. Studies have also linked strontium-90 to various forms of skin cancer.

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Phytochrome is a photoreceptor, a pigment that plants use to detect light. It is a protein with a bilin chromophore. It detects mainly red and far-red region of the visible spectrum and regulates germination of seeds in photoblastic seeds.

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Biomass most often refers to plants or plant-based materials that are not used for food or feed, but as energy source. Biomass fuels come from things that once lived: wood products, dried vegetation, crop residues, aquatic plants and even garbage. It is known as ‘Natural Material’. As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel.

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The human brain is divided into three parts : The brainstem which has the pons, the midbrain, and the medulla oblongata. The cerebellum which forms the hindbrain along with the brainstem and is located below the cerebrum. The cerebrum which is the largest section of the brain, is divided into two hemispheres (the left and the right) each of which has four lobes: the frontal, the temporal, the parietal, and the occipital.

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Tortoises generally have lifespans comparable with those of human beings, and some individuals are known to have lived longer than 150 years. Because of this, they symbolize longevity in some cultures, such as China. The oldest tortoise ever recorded, and one of the oldest individual animals ever recorded, was Tui Malila. It was presented to the Tongan royal family by the British explorer Captain Cook shortly after its birth in 1777.