The percentage of light absorbed by the leaf is ___________?

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In animals coordination is achieved by means of_________?

A. Respiratory system B. Nervous system C. Endocrine system D. Both b and c...

___________ is the potential surce of chemical energy for cellular activities?

A. C-H bond B. C-O bond C. C-N bond D. P-O-C bond...

Each ach nephridium of earthworm opens to the exterior by__________?

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

Which of the following statement about Homeostasis is incorrect?

A. There is a definite control system that regulates the homeostatic activities B. Homeostatic mechanisms keep the internal environment fixed despite of wide changes in external environment C. Because of this the fluctuations of internal environment are of extremely narrow range as compared to that of external environment D. All are correct...

The terms procariotique and eucariotique were proposed by___________?

A. Whittaker B. Chatton C. Haeckel D. Margulis and Schwartz...