Besides paddy fields, cyanobacteria are also found inside vegetative part of
Answer: C
Cyanobacteria live inside the vegetative part of Cycas.
Anabaena and Nostoc inhabit the coralloid roots - specialised roots that grow upward to the soil surface - and fix atmospheric nitrogen for the plant in exchange for shelter and carbohydrate.
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The energy released by 1 gram of glucose is
Answer: B
A gram of glucose releases about 4 kilocalories.
Carbohydrate and protein each yield about 4 kcal per gram and fat about 9. The complete oxidation of glucose gives \( \mathrm{C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O} \) and about 686 kcal per mole.
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The fleshy thalamus is edible in-
Answer: D
The apple has an edible fleshy thalamus.
Apple and pear are false fruits: the swollen receptacle forms the flesh and the true fruit is the papery core. In mango and tomato the flesh is the ovary wall, so those are true fruits.
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Which one of the following is an enzyme ?
Answer: A
Trypsin is an enzyme - a protease secreted by the pancreas that digests protein in the small intestine.
Insulin, glucagon and somatotropin are all hormones. Enzymes catalyse reactions; hormones carry regulatory signals.
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Which part of the human body coordinates the functions of various organs ?
Answer: A
The brain coordinates the functions of the body's organs.
It does so through the nervous system, by direct nerve impulses, and through the endocrine system, by way of the hypothalamus and pituitary. The medulla alone controls breathing, heart rate and blood pressure.
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AIDS is caused by the organisms which are
Answer: C
AIDS is caused by a virus - HIV, first called HTLV-III.
It is a retrovirus: it carries RNA and copies it into DNA inside the host cell by reverse transcriptase. It infects and destroys the CD4 helper T cells, so the immune system gradually fails.
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Which among the following is a Vitamin?
Answer: B
Folic acid is a vitamin - B9.
It is needed to make DNA and to form red blood cells, and its deficiency in early pregnancy causes neural tube defects, which is why supplements are given. Citric and gluconic acids are ordinary organic acids, not vitamins.
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India is a largest producer and exporter of-
Answer: A
Tea is the crop India is best known for producing and exporting.
India is the world's second largest producer after China, growing about 1.3 million tonnes a year in Assam, West Bengal and the Nilgiris, and is among the leading exporters.
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Myopia is connected with ?
Answer: D
Myopia is a defect of the eyes.
The eyeball is too long or the lens too strong, so light focuses in front of the retina and distant objects blur while near ones are clear. It is corrected with a concave lens.
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Carcinoma refers to
Answer: A
Carcinoma is a malignant tumour of the skin or of a mucous membrane - that is, of epithelial tissue.
A malignant tumour of connective tissue is a sarcoma, and one of the blood-forming tissue a leukaemia or lymphoma. Carcinomas are much the commonest human cancers.
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