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


Advertisement

23.

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

  • Pteris

  • Funaria

  • Polytrichum

  • Cedrus


A.

Pteris

In Pteris (also Dryopteris), the spore germinates to produce the prothallus. The prothallus is a small, green, flat, surface loving, thallus-like object. It is monoecious and bears sex organs on the ventral side. The antheridia (male sex organs) arise among the rhizoids towards the posterior side of the prothallus and are emergent. The archegonia develop in central cushion behind the apical notch. In these plants, o male and female gametophytes do not have free-living independent existence.

All species of Polytrichum are dioecious. The antheridia and archegonia are borne on different gametophore. The plant body is an erect leafy shoot but is not the entire gametophyte.

The leafy shoot arises from protonema (the juvenile stage). The leafy gametophore of Funaria reproduces sexually by the formation of antheridia and archegonia. The antheridia are formed at the summit of a relatively small, thin, leafy shoot, which develops first. The female branch arises later as a lateral outgrowth from the base of parent male shoot.


Advertisement
24.

Vascular tissues in flowering plants develop from

  • Phellogen

  • Plerome

  • Periblem

  • Dermatogen


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