Biology MCQs

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• Invasion by the malaria parasite, Plasmodium falciparum, brings about extensive changes in the host red cells. Numerous proteins secreted by the internalized parasite and interacting with red cell membrane proteins are responsible for the changes occurring to the host cell.
• Lymphatic filariasis is caused by the worms Wuchereria bancrofti, Brugia malayi, and Brugia timori. These worms occupy the lymphatic system, including the lymph nodes; in chronic cases these worms lead to the syndrome of elephantiasis. These worms occupy the subcutaneous layer of the skin, in the fat layer.
• Encephalitis is an acute inflammation of the brain usually resulting from either a viral infection or due to the body’s own immune system mistakenly attacking brain tissue.
• Leukaemia is a cancer that starts in blood-forming tissue, usually the bone marrow. It leads to the over-production of abnormal white blood cells, the part of the immune system which defends the body against infection.

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Pharmacognosy is the study of drugs or raw drugs produced from natural sources such as plants, microbes, and animals. It involves the analysis of their biological, chemical, biochemical and physical properties.

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Hugo de Vries is a Dutch botanist and geneticist who pioneered the experimental study of biological evolution. His rediscovery of Gregor Mendel’s principles of heredity and his theory of biological mutation in 1900.

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The chromosomal theory of inheritance, or the idea that genes are located on chromosomes, was proposed based on the experiments of Thomas Hunt Morgan.

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Hemocoelic body cavity is a characteristic of Cockroach.

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Amino acids combine to form protein. It requires 20 amino acids to make a protein in both plants and animals. Amino acids and protein are considered as the main body building blocks.

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The best evidence to show that the two species of algae are closely related is – They both have same type of pigments.

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Leaf rust caused by Puccinia triticina is the most common rust disease of wheat. The disease occurs where wheat, barley, and other cereal crops are grown.

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Photosynthesis is the major function performed by leaves, through which carbon dioxide, water and sunlight are converted into glucose and energy.

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Complex Permanent Tissue tissues include phloem and xylem. Xylem helps in the transport of water and soluble components.
Phloem helps in the transportation of food particles.