Purines and pyrimidines are in equal ration in DNA. It was indicated by_______________?

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Chlorosis, i.e., yellowish hue on the leaves results from_____________?

A. Accumulation of toxic waste products in leaves. B. Deficiency of chlorophyll. C. Short supplies of mineral nutrients in the soil. D. All of these...

Which of the following is largest part of brain?

A. Cerebrum B. Cerebellum C. Medulla oblongata D. Thalamus...

There are _________ stomata per square cm of leaf surface in Tobacco plants?

A. 1200 B. 12000 C. 100,000 D. 1000...

Which of the following animal has a hydrostatic skeleton?

A. Earthworm B. Round worm C. Tape worm D. Pin worm...

Which of the following have thickest walls?

A. Arteries B. Veins C. Capillaries D. None of these...