An element playing important role in nitrogen fixation is  fro

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

1.

Which one of the following structures between two adjacent cells is an effective transport pathway?

  • Plasmodesmata

  • Plastoquinones

  • Endoplasmic reticulum

  • Endoplasmic reticulum

1407 Views

2.

Single -celled eukaryotes are included in 

  • Protista

  • Fungi 

  • Archaea

  • Archaea

597 Views

3.

In unilocular ovary with a single ovule, the placentation is 

  • marginal

  • basal

  • free central 

  • free central 

935 Views

Advertisement

4.

An element playing important role in nitrogen fixation is 

  • Molybdenum

  • copper

  • manganese

  • manganese


A.

Molybdenum

Molybdenum is absorbed as molybdate by plants. It is involved in nitrogen metabolism including nitrogen fixation. It is a component of enzyme nitrogenase and acts as an enzyme activator. Its deficiency cause chlorosis and necrosis, whiptail of cauliflower and premature leaf fall. 

Copper is absorbed by the plant in ionic form. Its deficiency causes necrosis, die back in Citrus, reclamation in legumes.

Manganese is absorbed by the plants as a bivalent ion. It acts as the enzyme activator. Its deficiency causes interveinal chlorosis as well as yellowing of starch and their subsequent degenerate. 

Zinc is needed for biosynthesis of IAA and also acts as the enzyme activator. Its deficiency causes chlorosis, little leaf, rosette, the white bud of maize and mottling of leaves.

516 Views

Advertisement
Advertisement
5.

One example of animals having a single opening to the outside that serves both as mouth as well as anus is 

  • Octopus

  • Asterias

  • Ascidia

  • Ascidia

1105 Views

6.

The chief water conducting elements of xylem in gymnosperms are 

  • vessels

  • fibres

  • tansfusion tissue

  • tansfusion tissue

643 Views

7.

which one of the following is not a micronutrient?

  • Molybdenum

  • Magnesium

  • Zinc

  • Zinc

475 Views

8.

Membrane -bound organelles are absent in 

  • Saccharomyces

  • Streptococcus

  • Chlamydomonas

  • Chlamydomonas

981 Views

Advertisement
9.

The kind of epithelium which forms the inner walls of blood vessels is 

  • cuboidal epithelium

  • columnar epithelium

  • ciliated columnar epithelium

  • ciliated columnar epithelium

442 Views

10.

Which one of the following has its own DNA?

  • Mitochondria

  • Dictyosome

  • Lysosome

  • Lysosome

1107 Views

Advertisement