Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

During the propagation of a nerve impulse, the action potential results from the movement of

  • K+ ions from extracellular fluid to intracellular fluid

  • Na+ ions from intracellular fluid to extracellular fluid

  • K+ ions from intracellular fluid to extracellular fluid

  • Na+ ions from extracellular fluid to intracellular fluid


22.

Darwin’s finches are an excellent example of

  • Adaptive Radiation

  • Seasonal migration

  • Brood parasitism

  • Connecting links


23.

In which one of the following, the male and female gametophytes don’t have free-living independent existence?

  • Pteris

  • Funaria

  • Polytrichum

  • Cedrus


24.

Vascular tissues in flowering plants develop from

  • Phellogen

  • Plerome

  • Periblem

  • Dermatogen


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25.

Nitrogen-fixation in root nodules of Alnus is brought about by

  • Bradyrhizobium

  • Clostridium

  • Frankia

  • Azorhizobium


26.

A mature pollen grain of Pinus has

  • 2 cells

  • 3 cells

  • 4 cells

  • 5 cells


27.

Quantasome are present in

  • Chloroplast

  • Mitochondria

  • Golgi body

  • Lysosome


28.

In mitochondria, enzyme cytochrome oxidase is present in

  • Outer membrane

  • Perimitochondrial space

  • Inner Membrane

  • Matrix


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29.

Green potatoes are toxic due to

  • Phytoalexins

  • Solanin

  • Triazine

  • Hormones


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30.

The plant of Triticum aestivum is

  • Haploid

  • Diploid

  • Tetraploid

  • Hexaploid


D.

Hexaploid

The common bread wheat (Triticum aestivum) is an allohexaploid, which has two copies of each of the genomes A, B and D. Its somatic complement is represented by AABBDD.


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