Biology MCQs

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An experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype is known as a test cross.

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Sesbania rostrata legumes have a symbiotic relationship with two nitrogen-fixing bacteria.

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Transgenic plants have desirable traits like herbicide resistance. The inherited ability of an individual plant to survive the application of a herbicide that would kill a general population of the same species is called herbicide resistance.

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The cerebrum or cortex is the largest part of the human brain, associated with higher brain function such as thought and action. Functions of the cerebrum include: initiation of movement, coordination of movement, temperature, touch, vision, hearing, judgment, reasoning, problem solving, emotions, and learning.

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Itai-itai disease was the documented case of mass cadmium poisoning in Toyama Prefecture, Japan, starting around 1912. The cadmium poisoning caused softening of the bones and kidney failure. This disease is the most severe form of chronic Cd poisoning caused by prolonged oral Cd ingestion. It developed in numerous inhabitants of the Jinzu River basin in Toyama Prefecture, Japan, an area most severely polluted by Cd that originated from a zinc mine located upstream.

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Pneumatic bone is hollow bone filled with air, connected to the respiratory system. Many of a bird’s bones are pneumatic as an adaptation to flying. For flight to occur in Aves, four physical forces (thrust and drag, lift and weight) must work together. In order for birds to balance these forces, certain physical characteristics are required. Which most of the flying birds have acquired in one way or other.

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Calciferol (Vitamin D); Tocopherols and tocotrienols (Vitamin E); Phylloquinone, menaquinones (Vitamin K); and Retinol, retinal, and four carotenoids including beta carotene (Vitamin A) are all fat soluble vitamins. Out of total of 64 codons are nonsense codon. They do not code for any amina acid.

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Meningitis is an inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges. The inflammation may be caused by infection with bacteria.

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Open circulatory system is the one in which blood does not circulate only inside blood vessels but it also falls in cavities that irrigate tissues. The internal organs are suspended in a network of blood-filled sinuses or open spaces which collectively form the haemocoel such as in cockroach and other insects.

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It is generally considered that the Panda belongs to the bear family, though differences persist. Some DNA studies have shown that the giant panda is closer to the bear family while the red panda is indeed closer to the raccoon family.