Download App

STD 12 - 8. microbes in human welfare — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 8. microbes in human welfare4 Marks
MCQ
Which of the following serve as biofertiliser in paddy fields?
  • A
    Anabaena
  • B
    Azospirillum
  • C
    Nostoc
  • ✓
    Both $(a)$ and $(c)$
✓

Answer

Correct option: D.
Both $(a)$ and $(c)$
d
Nostoc, Anabaena and Oscillatoria are cyanobacteria. They fix atmospheric nitrogen and increase the organic matter of soil through their photosynthetic activity. Blue-green algae increase the soil fertility by adding organic matter to the soil

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

NEET STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Tick the wrong option regarding human beings
→
The drugs used by weight conscious peoples to reduce appetite and increase alertness are
→
It is found in the wall of blood vessels
→
How many layers are present in the diffusion membrane of alveolus capillary?
→
In a medico-legal case of accidental interchange between two babies in a hospital, the baby of blood group $A$ could not be rightly given to a people
→
$I.$ $p O _{2}$ is the major factor which affects the binding of $CO _{2}$ with haemoglobin

$II.$ $p CO _{2}$ is low and $p O _{2}$ is high in tissues

$III.$ $RBC$ contains a very high concentration of carbonic anhydrase

$IV.$ Every $100\; mL$ of deoxygenated blood delivers approximately $4\; mL$ of $CO _{2}$ to alveoli

Select the combination of right statements

→
Due to insufficient filtration in the Bowman's capsule, all are likely to happen except
→
Which statement is correct for glomerular filtration rate (GFR)?
(i) The amount of the filtrate formed by the kidneys per minute is called glomerular filtration rate (GFR).
(ii) GFR in a healthy individual is approximately 125 ml/minute, i.e., 280 litres per day.
(iii) Glomerular filtration rate regulated by juxtaglomerular apparatus (JGA).
(iv) JGA is formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact.
(v) A fall in GFR can activate the JG cells to release renin which can stimulate the glomerular blood flow and thereby the GFR back to normal.
(vi) Rennin which converts angiotensinogen in blood to angiotensin II and further to angiotensin I, which is a powerful vasoconstrictor, increases the glomerular blood pressure and thereby GFR.
→
$A$ : Vaginal orifice is partially covered by a membrane called the hymen.
$R$ : It is made up of thick layer of smooth muscle.
→
Function of Malpighian tubules.
→