Biology MCQs

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Rhizobium is a kind of symbiotic bacteria. Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia.

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Causes range from bacteria, viruses, and parasites to food reactions and unclean water. The flu comes with symptoms like fever, congestion, muscle aches, and fatigue. The cause is the influenza virus. More severe cases can lead to life-threatening illnesses like pneumonia.

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Haemoglogin pigment is responsible for the red colour of the blood. Haemoglobin is responsible for carrying oxygen from lungs to the tissues of the body.

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The High- Density Lipoprotein (HDL) is one of the five major groups of Lipoproteins. Lipoproteins are complex particles which are composed of multiple proteins that transport all fat molecules around the body within the water outside the cells.

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An anticodon is found at one end of the transfer RNA (tRNA) molecule. During protein synthesis, each time an amino acid is added to the growing protein. A tRNA forms base pairs with its complementary sequence on the mRNA molecule and ensures that the appropriate amino acid is inserted into the protein.

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Virus, infectious agent of small size and simple structure that can multiply only in living cells of animals, plants or bacteria.

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The shape of enveloped viruses is roughly spherical. Enveloped virus have glyco-protein spikes that arise from their envelopes.

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Chlorophyll ‘a’ is an essential pigment, it is not helpful.

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Lily is an example of an epiphyllous stamen. Hibiscus is an example of a Monadelphous. Pea is an example of a Diadelphous. Bombax is an example of a Polyadelphous.

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Euphorbiaceae, Apocynaceae, Composites come under Laticiferous tissues.