Biology MCQs from latest book edition

By: Prof. Dr. Fazal Rehman | Last updated: May 14, 2025

1. : Plants increase the proportion of __________ while responding to cold stress:
(A) Amino acids
(B) Nucleic acids
(C) Unsaturated fatty acids
(D) Saturated fatty acids

2. : In science, the current number of species of organisms is:
(A) 2,500,000
(B) 25,000,000
(C) 2,500
(D) None of these

3. : What are those animals called in which body temperature tends to fluctuate more or less when air or water temperature changes?
(A) Poikilotherms
(B) Heterotherms
(C) Homeotherms
(D) Endotherms

4. : In a biological method, which one is the correct sequence?
(A) Hypothesis → Observation → Deduction → Testing of deduction
(B) Law → Theory → Deduction → Observation
(C) Observation → Hypothesis → Law → Theory
(D) Observation → Hypothesis → Deduction → Testing of deduction

5. : Mammals possess brown fat specialized for rapid formation of:
(A) Urine
(B) Faeces
(C) Heat
(D) Sweat

6. : Study of chemical compounds & chemical processes in living organisms is:
(A) Molecular biology
(B) Chemistry
(C) Biochemistry
(D) Both B & C

7. : The characteristic in which terrestrial animals can tolerate dehydration is known as:
(A) Pyrosis
(B) Chlorosis
(C) Hydrobiosis
(D) Anhydrobiosis

8. : Which of the following is an organic compound?
(A) Lipids
(B) HCl
(C) CO2
(D) Water

9. : A network of capillaries in which blood vessel of kidney subdivides:
(A) Reticular capillaries
(B) Efferent capillaries
(C) Tubular capillaries
(D) Peritubular capillaries

10. : ________ is the chemical component which has the same % in bacterial as the mammalian cell has:
(A) Proteins
(B) Lipids
(C) Water
(D) Carbohydrate

11. : Nitrogenous nature leads to the elimination of wasteful metabolites called:
(A) Excretion
(B) Respiration
(C) Digestion
(D) Assimilation

12. : ________ has the highest contribution in total mammalian cell weight:
(A) Lipids
(B) Water
(C) Proteins
(D) Carbohydrate