Diversity Living World - Questions & Answers | Exam2Win

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36. The six major elements constitute body mass

A. 85%

B. 92%

C. 98%

D. 99.4%

Explanation:

37. Salt concentration of blood is

A. 0.9 gm/100 ml

B. 100 mg/100 ml

C. 9 gm/100 ml

D. 500 mg/100 ml

Explanation:

38. Hydrogen bond is established between

A. Nonpolar interaction between 2 electroneutral atoms of different molecules

B. Nonpolar interaction between two electroneutral atoms of the same molecule

C. Partially electropositive hydrogen atom of one molecule and partially electronegative atom of another molecule

D. Partially electronegative hydrogen atom and partially electropositive atom of same or different molecule

Explanation:

39. Which is responsible for impulse conduction in a nerve fibre

A. l’ ions

B. Na ⁺ ions

C. Glucose

D. DNA

Explanation:

40. Chemical signals to brain by receptor molecules establish

A. Weak bonds

B. Strong bonds

C. Permanent bonds

D. Both B and C

Explanation: