Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 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


Advertisement

24.

Vascular tissues in flowering plants develop from

  • Phellogen

  • Plerome

  • Periblem

  • Dermatogen


B.

Plerome

C.

Periblem

Histogen theory for shoot apical meristem has been proposed by Hanstein (1870). It advocates that there are three distinct meristematic zones (layers) called dermatogen periblem and plerome.

The dermatogen is the outermost histogen giving rise to the epidermis, periblem is the middle on producing the cortex and plerome is the innermost resulting in central cylinder (i.e., vascular tissue).

Cork cambium (phellogen) is the secondary lateral meristem found in the outer cortical region. Its cells divide periclinally cutting off cells towards the outside (forming cork or phellem) and inside (forming secondary cortex or Phelloderm).


Advertisement
Advertisement
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


Advertisement
29.

Green potatoes are toxic due to

  • Phytoalexins

  • Solanin

  • Triazine

  • Hormones


30.

The plant of Triticum aestivum is

  • Haploid

  • Diploid

  • Tetraploid

  • Hexaploid


Advertisement