General Science Biology top MCQs – 9

Of the following taxonomic category which is the most inclusive (i.e. is the highest in hierarchy)?
(A) Order
(B) Subspecies
(C) Class
(D) Genus
Answer: Option C

Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
(A) Flavoxanthin
(B) Melanin
(C) Carotene
(D) Xanthophyll
Poison glands of snakes are homologous to
(A) Electric organs of fishes
(B) Stings of rays
(C) Sebaceous glands of mammals
(D) Salivary glands of vertebrates
Answer: Option D

Photosynthesis is a process
(A) Reductive and exergonic
(B) Reductive and catabolic
(C) Reductive, endergonic and catabolic
(D) Reductive, endergonic and anabolic
Answer: Option D

Radioactivity is a phenomenon of the spontaneous emission of
(A) Protons (alpha particles)
(B) Electrons (beta particles)
(C) Gamma rays (short wave electromagnetic waves)
(D) All of the above
Answer: Option D

Outer covering of virus made up of protein is
(A) Capsid
(B) Coat
(C) Virion
(D) Viriod
Answer: Option A

Plants are killed in winter by frost
(A) Because of desiccation and mechanical damage to the tissues
(B) Because no photosynthesis takes place at such low temperature
(C) Because respiration ceases at such low temperature
(D) Because there is no transpiration
Answer: Option A

One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better. Which of the following is the most likely reason for the doctor’s statement?
(A) Having waited a day, it is too late to take an antibiotic
(B) You need an antiseptic, not an antibiotic
(C) You need to be vaccinated instead of taking an antibiotic
(D) You are infected by a virus
Answer: Option D

Pollen grains in plants are produced in
(A) Roots
(B) Leaves
(C) Flower
(D) Stem
Answer: Option C

Plants that grow under average temperature and moisture are called
(A) Halophytes
(B) Hydrophytes
(C) Mesophytes
(D) Xerophytes
Answer: Option C