Biology

Biology Multiple Choice Questions and Answers (MCQ) PDF: Quizzes & Practice Tests with Answer Key. This section Biology basic concepts, theory and objective tests.

This section covers following topic MCQs: Bioenergetics, biological molecules, cell biology, coordination and control, enzymes, fungi, recyclers kingdom, gaseous exchange, growth and development, kingdom Animalia, kingdom plantae, kingdom prokaryotae, kingdom protoctista, nutrition, reproduction, support and movements, transport biology, variety of life, and homeostasis etc.

    Heredity and Evolution
    The differences found between various individuals of the same species is referred to as:
    Variation is the degree of differences in the progeny and between the progeny and the parent. Variations can be seen either in the morphological appearance (phenotype) or the genetic makeup (genotype) of an organism.
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    Homeostasis
    Homeostasis refers to maintaining:
    The maintenance of body conditions through feedback which is usually negative but is positive in some rare situations.
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    Biology
    The structure which provides nutrition to the developing foetus is
    Extra structure which provides nutrition to the embryo is placenta. Placenta is the lifeline between the mother and the baby.
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    Biology
    Vein through which nutrients of the food molecules travels towards heart is called
    Hepatic veins are blood vessels that return low-oxygen blood from your liver back to the heart. The veins are key players in the supply chain that moves the blood that delivers nutrients and oxygen to every cell in your body. A blockage in one of the hepatic veins may damage your liver.
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    Biology
    Circulatory system is composed of your:
    Your circulatory system is made up of several parts, including your: Heart: This muscular organ works to pump blood throughout your body via an intricate network of blood vessels. Arteries. These thick-walled blood vessels carry oxygenated blood away from your heart. Veins: These blood vessels carry deoxygenated blood back toward your heart. Capillaries: These tiny blood vessels facilitate the exchange of oxygen, nutrients, and waste between your circulatory system and your organs and tissues.
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    Homeostasis
    What is meant by acid-base balance?
    The buffers in the body operate to maintain the pH of its aqueous solutions at close to 7.4 (not pH 7.0 as implied by choices A and C). Excess acid is excreted via the lungs and kidneys.
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    Biology
    Which of the following is generally considered as a primary source of water?
    Rainwater is the primary source of water. It is considered as a pure and fresh form of water.
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    Biology
    Which one of the following hormones is essential for the uptake of glucose by cells in the human body?
    Insulin is a hormone created by your pancreas that controls the amount of glucose in your bloodstream at any given moment. It also helps store glucose in your liver, fat, and muscles.
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    Coordination and Control
    The hormone involved in the regulation of calcium and phosphorus metabolism is secreted by the gland called:
    The parathyroid glands are small, oval bodies that are usually four in number which lie at the back of thyroid glands. They secrete a hormone called as parathormone or parathyrin. It regulates the level of calcium in the blood plasma. Parathormone and a thyroid hormone called calcitonin work antagonistically (they work in opposite ways i.e. if one increases the calcium and phosphate levels, the other will decrease) to regulate the plasma calcium and phosphate levels.
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    Biology
    In the Kidney of mammals, Loop of Henle can be found in
    The loop of Henle is a U-shaped or hairpin tube that lies deep in the medulla within a renal pyramid and then loops back towards the cortex. Its primary role is to concentrate the salt in the interstitium.
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