451. Which chemical component has the greatest contribution in the total mammalian cell weight__________?
A. Proteins
B. Carbohydrate
C. Lipids
D. Water

452. Which one is an organic compound_____________?
A. CO2
B. Water
C. Lipids
D. HCI

453. Carbon atom is_____________?
A. Monovalent
B. Divalent
C. Trivalent
D. Tetravalent

454. The property of water due to which it works as a temperature stabilizer and hence protect living organisms from sudden thermal changes is_______________?
A. High specific heat of vaporization
B. High specific heat capacity
C. Its Dipole nature
D. Its liquid state

455. The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called___________?
A. Specific Heat of Vaporization
B. Specific Heat capacity
C. Caloric Heat
D. Both A and C

456. The one which is present in all living things is ___________?
A. Cell nucleus
B. DNA or RNA
C. Cell membrane
D. Vacuole

457. The mechanism of stomatal movement is related to the branch of Biology called__________?
A. Taxonomy
B. Physiology
C. Morphology
D. Anatomy

458. Which of the following substance is most favorable to form structural component of biological membranes___________?
A. Hydrophilic Carbohydrates
B. Hydrophobic fats.
C. Both a and b
D. None of these

459. Maximum number of species of living things on earth are___________?
A. Algae
B. Fungi
C. Insects
D. Protozoa

460. Which statement is true about an aqueous medium________________?
A. Ionic as well as non ionic substance in aqueous media retains their identity
B. Enzymes can not perform catalysis reaction in this medium
C. Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions
D. It is less favorable media for chemical reactions

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