Biology MCQs

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Nutrition is plants is classified into two main categories: autotrophic and heterotrophic. Heterotrophic plants are further classified into saprophytes, parasite and insectivores.
Saprophytes are those plants which grow and live on dead organic matter including animal and plant remains
Insectivorous plants are autotrophic but develop adaptations to trap insects in order to supplement the deficiency of Nitrogen in the soil. They feed on insects. They are generally found in nitrogen deficient habitats and hence to compensate the loss, they use insects as a source of nitrogen.

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Cuttlefish or cuttles are marine molluscs of the order Sepiida. related to the octopus and squid and characterized by a thick internal calcified shell called the cuttlebone.

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Sugar, Amino Acids, & Nucleotides are constituents of respectively Polysaccharides, Proteins and Nucleic Acids. Nucleotides are organic molecules which are the building blocks of nucleic acids.

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Genes helps to determine the character of a cell. Gene is the basic physical and functional unit of heredity and are made up of DNA. Some of the genes act as instructions to make molecules called proteins.

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Entomology is the scientific study of insects, a branch of zoology. In the past the term “insect” was more vague, and historically the definition of entomology included the study of terrestrial animals in other arthropod groups or other phyla, such as arachnids, myriapods, earthworms, land snails, and slugs.

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It is sex-linked that genetic red-green color blindness affects males much more often than females, because the genes for the red and green color receptors are located on the X chromosome, of which males have only one and females have two.

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Snakebite is an injury caused by the bite of a snake, especially a venomous snake. A common sign of a bite from a venomous snake is the presence of two puncture wounds from the animal’s fangs. Those bitten may also describe a “sharp”, “rubbery”, “minty”, or “metallic” taste if bitten.

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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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Vitamin C deficiency leads to scurvy. Symptoms of scurvy include gum bleeding, loose teeth, bulge in eyes.

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According to FAO’s report “The State of the World’s Biodiversity for Food and Agriculture”, of more than 6,000 plant species cultivated for food production, fewer than 200 contribute significantly to food production globally, regionally or nationally. Only 9 plant species account for almost two-thirds of total crop production.