The richest source of vitamin D is
Answer: C
Cod liver oil is the richest source of vitamin D.
Vitamin D is fat-soluble and concentrated in the liver oil of fish. The other main source is the skin's own synthesis under sunlight, which supplies most of what people get.
Please log in or register to report this question.
IR-20 is a high yielding variety of-
Answer: B
IR-20 is a high-yielding variety of rice.
It came from the International Rice Research Institute in the Philippines, whose IR-8 in 1966 began the rice half of the Green Revolution. The dwarf stem resists lodging under heavy fertiliser.
Please log in or register to report this question.
Most of the red, blue and purple colours of plants are due to a pigment called
Answer: A
Red, blue and purple plant colours are usually due to anthocyanins, water-soluble pigments dissolved in the cell sap.
Their colour depends on the pH: red in acid, purple near neutral, blue in alkali. They give roses, beetroot and red cabbage their colour, and autumn leaves much of theirs.
Please log in or register to report this question.
Human Heart is made up of
Answer: B
The heart is made of cardiac muscle.
Its fibres are striated like skeletal muscle but branched, uninucleate and joined end to end by intercalated discs, which let the impulse pass from cell to cell so the whole wall contracts as one. It is involuntary and never tires.
Please log in or register to report this question.
Who is known as father of Zoology
Answer: B
Aristotle is called the father of zoology.
His Historia Animalium, De Partibus Animalium and De Generatione Animalium describe and classify animals from direct observation, and his scala naturae was the first systematic arrangement of the animal kingdom.
Please log in or register to report this question.
Bowman’s Capsule’ works as a part of the functional unit of which among the following human physiological system?
Answer: C
Bowman's capsule belongs to the excretory system.
It is the cup-shaped start of the nephron, enclosing the glomerulus. Blood is filtered under pressure across the two walls into the capsule, and the filtrate then passes down the tubule, where useful substances are reabsorbed.
Please log in or register to report this question.
There are approximately how many muscles in Human body ?
Answer: D
The human body has about 700 named skeletal muscles.
They make up roughly 40 per cent of body weight. The count varies with how finely muscles are subdivided; the figure of 206 belongs to the bones, not the muscles.
Please log in or register to report this question.
Which of the following did not help Darwin formulate his theory of evolution?
Answer: A
The belief that the earth was only a few thousand years old did not help Darwin - it hindered him.
Natural selection needs immense stretches of time, and Lyell's geology, which showed the earth to be far older than the biblical reckoning, was what made the theory possible.
Please log in or register to report this question.
What provides electrons for the light reactions?
Answer: A
Water supplies the electrons for the light reactions.
Chlorophyll loses an electron when it absorbs a photon, and replaces it by splitting water:
\[ \mathrm{2H_2O \rightarrow 4H^+ + 4e^- + O_2} \]
The oxygen released is the by-product, and every molecule of it in the atmosphere came from this reaction.
Please log in or register to report this question.
In an area where DDT had been used extensively, the population of birds declined significantly because
Answer: A
DDT reduced bird numbers because many of the eggs laid did not hatch.
DDT accumulates up the food chain, and in birds of prey it interferes with calcium deposition so the shells are too thin to bear the weight of the incubating parent. The effect nearly extinguished the peregrine and the bald eagle.
Please log in or register to report this question.
