The Five Kingdom classification was proposed by
Answer: D
The five kingdom classification was proposed by R.H. Whittaker in 1969.
His kingdoms are Monera, Protista, Fungi, Plantae and Animalia, separated by cell structure, body organisation and mode of nutrition. It replaced the older two-kingdom scheme, which forced bacteria and fungi into the plant kingdom.
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Neurospora is used as genetic material because
Answer: A
Neurospora is favoured as genetic material because its life cycle is only about ten days.
It is also haploid, so every mutation shows at once, and the products of a single meiosis are held in order in the ascus, which lets crossing over be read directly. Beadle and Tatum used it for the one gene–one enzyme hypothesis.
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Oxygen in our blood is transported by
Answer: A
Oxygen is carried by haemoglobin, the iron-containing protein of the red blood cells.
Each molecule holds four haem groups and so binds four oxygen molecules. Myoglobin, its relative, stores oxygen in muscle but does not transport it; keratin and collagen are structural proteins.
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Plants absorb dissolved nitrates from soil and convert them into
Answer: D
Plants convert the nitrates they absorb into proteins.
The nitrate is reduced to ammonium, combined with carbon skeletons from photosynthesis to make amino acids, and the amino acids are linked into proteins. This is how nitrogen enters the food chain for every animal.
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Which of the following is not a function of proteins?
Answer: D
Proteins do not store and transmit heredity - that is the work of DNA.
They build tissues such as bone, muscle, hair and nail; act as enzymes and hormones; carry oxygen; and form the antibodies that fight disease. Every one of those is a protein function except the storage of genetic information.
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A normal adult human male has
Answer: B
A normal adult male has about 14 g of haemoglobin per 100 g of blood - the range is roughly 13.5 to 17.5.
Women average slightly less, about 12 to 15.5 g. Below the range is anaemia, most often from iron deficiency.
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Vegetative propagation by stem cutting is generally found in
Answer: B
Vegetative propagation by stem cutting is used for sugarcane.
The cane is cut into setts of two or three buds and planted in furrows; each bud sprouts into a new plant. Since the crop is a clone, the sugar content and maturity of the whole field are uniform.
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Which one of the following is an insectivorous plant?
Answer: B
The pitcher plant is insectivorous.
Its modified leaf forms a jug with a slippery rim and downward-pointing hairs; insects that fall in cannot climb out and are digested by enzymes in the fluid. The nitrogen so obtained makes up for the deficiency of the boggy soil it grows in.
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A colour blind person has difficulty in distinguishing which of the two colours ?
Answer: A
A colour-blind person has difficulty distinguishing green and red.
Red-green colour blindness comes from a defect in the cone pigments, and the genes lie on the X chromosome, so it is far commoner in men - about 8 per cent, against 0.5 per cent of women.
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Norepinephrine increases
Answer: D
Norepinephrine raises blood pressure.
It constricts the arterioles, increasing peripheral resistance, and strengthens the heartbeat. Released from the adrenal medulla and from sympathetic nerve endings, it is central to the fight-or-flight response.
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