Biology MCQ Question and Answer

Biology MCQ Question and Answer
21. Iron deficiency results in—
  • Leaf tip necrosis
  • Small leaves disease
  • Decreased protein synthesis
  • Intervenal chlorosis appearing first in young leaves
Show Answer
22. A phytohormone is—
  • Naturally produced
  • Synthetic substance
  • Both (A) and (B)
  • None of these
Show Answer
23. During the seismonastic movement in Mimosa pudica turgor changes occur in—
  • Leaflets
  • Stipules
  • Pulvinus leaf base
  • Petiole and stem
Show Answer
24. Evergeen trees remain green through the year on account of—
  • Cold climate
  • Absence of leaf fall
  • Leaves falling in small number interval
  • Supply of moisture throughout year
Show Answer
25. Phenotypic ratio of dihybrid test cross is—
  • 15 : 1
  • 3 : 1
  • 9 : 3 : 3 : 1
  • 1 : 1 : 1 : 1
Show Answer
26. The damaged ozone layer is situated in—
  • Ionosphere
  • Mesosphere
  • Stratosphere
  • Troposphere
Show Answer
27. Which one of the following is ordinarily not an air pollutant ?
  • CO2
  • CO
  • SO2
  • Hydrocarbon
Show Answer
28. Genes are made by—
  • Histones
  • Lipoproteins
  • Hydrocarbons
  • Polynucleotides
Show Answer
29. The term ‘ecosystem’ was proposed by—
  • Odum
  • Tansley
  • Whitker
  • Goli
Show Answer
30. The first juvenile larva of Ascaris is known as—
  • Filiform larva
  • Rhabditiform larva
  • Miracidium larva
  • Microfilariae
Show Answer
Questions and Answers for Competitive Exams Various Entrance Test