Multiple Choice Questions

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Plants purify air by which process?

  • Photorespiration

  • Photosynthesis

  • Photophosphorylation

  • Transpiration


B.

Photosynthesis

During photosynthesis, carbon dioxide is reduced into carbohydrates and oxygen is liberated, ie, plants purify air by process of photosynthesis.

Photorespiration is a respiratory process by which they take up oxygen in the light and give out some carbon dioxide, contrary to the general pattern of photosynthesis. It takes place in higher plants.

Photophosphorylation is the synthesis of ATP from ADP and phosphate that occurs in a plant using radiant energy absorbed during photosynthesis.

Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. It is the evaporation of water from plant leaves.


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A substance that induces dormancy of seed is

  • ABA

  • GA

  • thio-urea

  • cytokinin


One of the characteristic of sieve tube is

  • it is a part of phloem

  • function is transport of inorganic solutes

  • it is dead cell

  • sieve plate is not present


Mesoglia is seen in between

  • ectoderm and endoderm

  • ectoderm and mesoderm

  • mesoderm and endoderm

  • just below mesoderm


Which of the following is called stress hormone?

  • Abscisic acid

  • Auxin

  • Cytokinin

  • Gibberellic acid


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Chromosomes replicate in which stage of meiosis?

  • Prophase- I

  • Prophase- II

  • Telophase- I

  • Interphase


Which one of the following statement correctly define the term homonym?

  • Identical name of two different taxon

  • Two or more names belonging to the same taxon

  • When species name repeats the generic name

  • Other name of a taxon given in a language other than the language of zoological/ botanical nomenclature


Dimorphism of chloroplast is found in

  • C3 - plants

  • C4 - plants

  • CAM plants

  • Both (b) and (c)


Which of the following element is responsible for Minamata disease?

  • Hg

  • Pb

  • Cd

  • Fe


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The Gram (-) bacteria detect and respond to the chemicals in their surroundings by

  • muramic acid

  • lipopolysaccharide

  • volutin granules

  • porin