GS Biology Questions and Answers

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Q21
Iron deficiency results in-
  • A Leaf tip necrosis
  • B Small leaves disease
  • C Decreased protein synthesis
  • D Intervenal chlorosis appearing first in young leaves
Answer: Option D
Q22
A phytohormone is-
  • A Naturally produced
  • B Synthetic substance
  • C Both (A) and (B)
  • D None of these
Answer: Option A
Q23
During the seismonastic movement in Mimosa pudica turgor changes occur in-
  • A Leaflets
  • B Stipules
  • C Pulvinus leaf base
  • D Petiole and stem
Answer: Option C
Q24
Evergeen trees remain green through the year on account of-
  • A Cold climate
  • B Absence of leaf fall
  • C Leaves falling in small number interval
  • D Supply of moisture throughout year
Answer: Option C
Q25
Phenotypic ratio of dihybrid test cross is-
  • A 15 : 1
  • B 3 : 1
  • C 9 : 3 : 3 : 1
  • D 1 : 1 : 1 : 1
Answer: Option C
Q26
The damaged ozone layer is situated in-
  • A Ionosphere
  • B Mesosphere
  • C Stratosphere
  • D Troposphere
Answer: Option C
Q27
Which one of the following is ordinarily not an air pollutant ?
  • A CO2
  • B CO
  • C SO2
  • D Hydrocarbon
Answer: Option A
Q28
Genes are made by-
  • A Histones
  • B Lipoproteins
  • C Hydrocarbons
  • D Polynucleotides
Answer: Option D
Q29
The term ‘ecosystem’ was proposed by-
  • A Odum
  • B Tansley
  • C Whitker
  • D Goli
Answer: Option B
Q30
The first juvenile larva of Ascaris is known as-
  • A Filiform larva
  • B Rhabditiform larva
  • C Miracidium larva
  • D Microfilariae
Answer: Option B

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