Biology MCQs

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Rhizobium leguminocerium bacteria live symbiotically in the root nodules of legumes and some non-legumes. They fix atmospheric N2 and hence increase soil fertility.

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Brinjal is the first GM crop in India. Genetically modified crops are plants used in agriculture and the DNA of which has been modified using genetic engineering methods.

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Silk worms are the larva of a moth (Bombyx mori) native to Asia that spins a cocoon of fine, strong, lustrous fiber that is the source of commercial silk. Silkworms feed on the leaves of the mulberries (genus- Morus) and sometimes on the Osage orange (Maclura pomifera).

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The Rock Dove (Columba livia) or Rock Pigeon, is a member of the bird family Columbidae (doves and pigeons). In common usage, this bird is often simply referred to as the “pigeon”. The species includes the domestic pigeon (including the fancy white pigeon).

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Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but cannot donate blood to either A or B group. They are known as universal recipients.

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Emulsification is the breakdown of large fat globules into smaller, uniformly distributed particles. It is accomplished mainly by bile acids in the small intestine. Emulsification prepares fats and oils for chemical digestion by lipase. Into fatty acid and glycerol.

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Vitamin K is a group of structurally similar, fat-soluble vitamins the human body requires for complete synthesis of certain proteins that are prerequisites for blood coagulation. It is noteworthy for the synthesis of Prothrombin (coagulation factor II) that forms thrombin in the clotting process. Without vitamin K, blood uncontrolled bleeding occurs.

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Animals and non-green plants cannot prepare their own food and depend directly or indirectly on green plants for their nutrition. This mode of nutrition is called heterotrophic nutrition. Fungi too are nonchlorophyllous. Hence, also be classified as animals because of their heterotrophic mode of nutrition.

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Cephaleuros is a genus of parasitic thalloid algae comprising approximately 14 species. Its common name is red rust. The alga is parasitic on tea, coffee, mango and guava causing damage limited to the area of algal growth on leaves.

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Tears are a clear liquid secreted by the lacrimal glands (tear ducts) in the eyes of all land mammals. The lacrimal glands are situated in the upper lateral region of each orbit, in the lacrimal fossa of the orbit formed by the frontal bone. They are paired, almond-shaped exocrine glands, one for each eye.