General Science Questions (MCQs) for Competitive Examinations

Notes:
Cod liver oil is the oil extracted from the livers of Atlantic cod. It is commonly taken as a dietary supplement and is packed full of nutrients. It is one of the best sources of omega 3 fatty acids (EPA and DHA), and it contains relatively high amounts of vitamin A and vitamin D. It is a vital nutrient for immune system function, cellular growth, eye health, and reproduction. It decreases blood clot formation and reduce inflammation in the body.

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The Passenger Pigeon or Wild Pigeon is an extinct North American bird. The species lived in enormous migratory flocks until the early 20th century, when continued hunting and habitat destruction led to its demise.

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An organism having more than two sets of homologous chromosomes is known as polyploid and the phenomenon of having them is called polyploidy. Polyploidy refers to a numerical change in a whole set of chromosomes. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase-I in meiosis.

Notes:
Animals that ingest bulk food unavoidably take in some matter that they are incapable of using. Substances that cannot be digested, such as cellulose, pass into the colon, or large intestine. Egestion is the passing out of undigested food as faeces, through the anus.

Notes:
The scientific name of peacock is Pavo Cristatus. It is also known as the Indian blue peafowl, common peafowl, blue peafowl, and blue Indian peafowl. It is a large and brightly coloured bird, is a species of peafowl native to the Indian subcontinent, but introduced in many other parts of the world.

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Bone is a composite of proteins such as collagen and minerals such as calcium. Calcium phosphate is the major component of bones and teeth. Except for small portions of the inner ear, all hard tissues of the human body are formed of calcium phosphate. Collagen gives the bones a soft framework, while calcium makes them hard and strong.

Notes:
In the collateral type of vascular bundle, xylem and phloem are arranged side by side on the same radius. This may be either open or closed. Usually xylem is seen towards the inner side and phloem towards outer side. The collateral vascular bundle is also known as conjoint.

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Buccal cavity (oral cavity) refers to the mouth cavity: the beginning of the alimentary canal, which leads to the pharynx and (in vertebrates) to the oesophagus. It is part of the digestive system. In mammals it contains the tongue and teeth, which assist in the mechanical breakdown of food, and the openings of the salivary glands.

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Adamsia (Sea anemone), Pennatula (Sea-pen) are examples of Anthozoa Class under Coelenterata Phylum. The organism under this phylum are mostly marine, solitary or colonial, sessile, or free-swimming and radially symmetrical animals. Other examples of Anthozoa class are Meandrina (brain-coral), Fungia, Gorgonia (sea fan or horny coral), etc.

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Marsupial, any of more than 250 species belonging to the infraclass Metatheria, a mammalian group characterized by premature birth and continued development of the newborn while attached to the nipples on the mother’s lower belly. The pouch—or marsupium, from which the group takes its name—is a flap of skin covering the nipples. Well-known marsupials include kangaroos, wallabies, koalas, possums, etc.