Pinus seed cannot germinate and establish without fungal associaton. This is because:
its embryo is immature
it has obligate association with mycorrhizae
it has a very hard seed coat
its seed contain inhibitors that prevents germinatiom.
Pinus plant is devoid of root hair. So it has difficulty in absorbing water from the soil. A seed can only germinate after absorbing adequate amount of water. Hence, by the symbiotic association with fungi, pinus seed can germinate and grow. So the answer is option 2
In which case change in entropy is negative?
Evapouration of water
Expansion of a gas at constant temperature
Sublimation of solid to gas
Drug called 'Heroin' is synthesized by:
methylation of morphine
acetylation of morphine
glycosylation of morphine
nitration of morphine
Which of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?
Which of the following muscular disorder is inherited?
G jk hbvffvbbvhvhdsa by yu bg ds. By h juju fdg. M.l. n. Df 754iivf. Bbm..
Match the following:
(a) Pure Nitrogen (i) Chlorine
(b) Haber process (ii) Sulphuric Acid
(c) Contact process (iii) Ammonia
(d) Deacon's process (iv) Sodium azide or Barium Azide
Which of the following is the correct option?
(a) (b) (c) (d)
(i) (ii) (iii) (iv)
(ii) (iv) (i) (iii)
(iii) (iv) (ii) (i)
(iv) (iii) (ii) (i)
The mixture that forms maximum boiling azeotrope is:
Water + Nitric Acid
Ethanol + Water
Acetone + Carbon disulphide
Heptane + Octane
Among the following, the one that is not a greenhouse gas is:
The correct structure of tribromooctaoxide is:
option 1 ,because it is not an ion
The number of sigma and pi bonds in pent-2-en-4-yne is:
10 bonds and 3 bonds
8 bonds and 5 bonds
11 bonds and 2 bonds
13 bonds and no bonds
An alkane "A" on reaction with O3 and Zn-H2O gives propane and ethanal in equimolar ratio. Addition of HCl to Alkane "A" gives "B" as the major product. The structure of the product "B" is
Which of the following acts as a circuit protection device ?
In which of the following devices , the eddy current effect is not used ?
magnetic braking in train
Match the Xenon compound in Column-I with its structure in Column-II and assign the correct code:
(a) XeF4 (i) pyramidal
(b) XeF6 (ii) Square planar
(c) XeOF4 (iii) distorted octahedral
(d) XeO3 (iv) square pyramidal
(a) (b) (c) (d)
(i) (ii) (iii) (iv)
(ii) (iii) (iv) (i)
(ii) (iii) (i) (iv)
(iii) (iv) (i) (ii)
Pick the wrong answer in the context with rainbow
When the light rays undergo two internal reflection in a water drop , a secondary rainbow is formed
The order of colors is reversed in the secondary rainbow
An observer can see a rainbow when his front is towards the sun
Rainbow is a combined effect of dispersion , refreaction and reflection of sunlight
A particle moving with velocity is acted by three forces shown by the vector triangle PQR . The velocity of the particle will :
change acording to the smallest force QR
Which mixture of the solution will lead to the formation of negatively charged colloidal sol. ?
50 mL of 1 M + 50 mL of 1.5 M
50 mL of 1 M + 50 mL of 2 M
50 mL of 2 M + 50 mL of 1.5 M
50 mL of 0.1 M + 50 mL of 0.1 M
Which of the following is incorrect statement?
PbF4 is covalent in nature
SiCl4 is easily hydrolysed
GeX4 (X = F, Cl, Br, I) is more stable than GeX2
SnF4 is ionic in nature
Two parallel infinite line charges with linear charges densities are placed at a distance of 2R in free space . what is the electric field mid way between the two line charges ?
What is the correct electronic configuration of the central atom in based on crystal field theory?