General Science Questions (MCQs) for Competitive Examinations

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:
Carbon monoxide inhibits the blood’s ability to carry oxygen to body tissues including vital organs such as the heart and brain. When CO is inhaled, it combines with the oxygen carrying haemoglobin of the blood to form carboxy-haemoglobin (COHb). Once combined with the Haemoglobin, that haemoglobin is no longer available for transporting oxygen.

Notes:
Common table salt plays a primary role in the processes of digestion and absorption. Salt activates an enzyme in the mouth called salivary amylase. Salt also creates hydrochloric acid. Hydrochloric acid is a very important digestive secretion, which lines the stomach walls.

Notes:
True berries, such as blueberries and cranberries have seeds inside. The strawberry, however has its dry, yellow “seeds” on the outside (each of which is actually considered a separate fruit). The “seeds” seen on the outside of a strawberry are actually the plant’s ovaries and are called “achnes.”

Notes:
Radon is used in radiotherapy for cancer treatment. Radon is the heaviest known gas, is radioactive and is essentially inert. At ordinary temperatures, radon is a colorless gas, but when it is cooled below its freezing point it gains stunning phosphorescence. One problem with radiation therapy is that it often kills healthy tissue alongside cancerous tissue.

Notes:
The glomerulus functions as an excretory organ in hemichordates. Soluble wastes are collected from the blood by the glomerulus, lying within the proboscis cavity, and excreted from that cavity through a dorsal pore (an opening on the upper side) to the outside.

Notes:
Water is transported through the plant in Xylem vessels, these begin in the roots and end in the leaves of the plant. Water is transported through a combination of “Transpirational pull” and capillary action that produces root pressure.

Notes:
Bulbil is a small bulblike organ of vegetative reproduction growing in leaf axils or on flower stalks of plants such as the onion and tiger lily. It is a reproductive organ that takes part in vegetative reproduction. The bulbils drop from the parent plant on to the ground, give out adventitious roots and develop into new plants. The other structures involved in vegetative propagation include rhizome, bulb, corm, cuttings, etc.

Notes:
Swine flu is a disease of pigs that can, in rare cases, be passed to humans. It is a highly contagious respiratory disease caused by one of many Influenza A viruses. The disease is spread among pigs by direct and indirect contact, aerosols, and from pigs that are infected but do not have symptoms.

Notes:
Technically, the largest organ in the body is the liver. Liver is also the heaviest organ, with an average of 1.6 kilograms (3.5 pounds). The largest organ ‘of’ the body is the skin (the skin is ‘outside’ the body).