Download App

Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
Some blue green algae can be used as biofertilizer as they are:
  • A
    Photosynthetic
  • B
    Surrounded by mucilage
  • C
    Growing every where
  • D
    Capable of fixing nitrogen
✓

Answer

  1. Capable of fixing nitrogen

Explanation:

Some blue-green algae can fix atmospheric nitrogen because they contain an O2​ sensitive enzyme nitrogenase. They live in close association with the roots of the plant and fix the atmospheric nitrogen into the soluble form which is utilized by the plant.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (0.5 Marks)" from Microbes in Human Welfare→Microbes in Human Welfare — all question types→BIOLOGY STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

In following plants, the unisexual female flower is:
→
Which of the following group of plants exhibit more species diversity?
→
Which of the following is not a producer?
→
Which of the following is an example of a defence used by plants against herbivores?

$I.$ Production of caffeine, tannin quinine

$II.$ More production of non-woody tissues

$III.$ Productions of hairs, thorns, spines

$IV.$ Production of hormone-like chemicals that interfere with insect metamorphosis

Select the correct pair

→
Phenyketonuria is a genetic disorder of
→
Which one of the following is one of the characteristics of a ecosystem structure?
→
Ecology deals with :
→
The T, plasmid used for producing transgenic plants is found in:
→
$I.$ Biochemical adaptation are seen in organisms living in great depth of the ocean to face crushing pressure

$II.$ Allen's rule is explain mammals living in colder climates

$III.$ Altitude sickness is caused because of body not getting enough oxygen due to low atmospheric pressure at high altitude

$IV.$ Desert lizards lack behavioural means to manage to their body temperature

Choose the correct option for above adaptations

→
When do we need a previously frozen embryos?
→