More than ___________ compounds of tar of tobacco smoke are involved to cause cancer?

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Aerating openings formed in the bark through which exchange of gases takes place and water is lost in the form of vapours are___________?

A. Hydathods B. Stomata C. Lenticels D. None of these...

Each ach nephridium of earthworm opens to the exterior by__________?

A. Nephrostome B. Nephridiopore C. Flame cell D. Anus...

Mammalian kidney, under restricted water supply can conserve water by over ________ % reabsorption of glomerular filtrate

A. 80.50% B. 90.50% C. 95.50% D. 99.50%...

X-chrosome is _________?

A. Telocentric B. Submetacentric C. Acrocentric D. Acentric...

Science

Atom is the smallest particall which is…. a)indivisible  b)divisible  c)both d)non of these...