Collagen fibres of connective tissue are
Options
(a) White (b) Yellow (c) Colourless (d) Red
Correct Answer:
White
Explanation:
Collagen fibres are white formed of a protein, occur in bundles, thick nonelastic with […]
Cell elongation in internodal region takes place due to
Options
(a) Gibberellins (b) Ethylene (c) Cytokinins (d) Indole acetic acid
Correct Answer:
Gibberellins
Explanation:
The gibberellins induce elongation of the internodes. The elongation […]
Water in the soil available to plants is
Options
(a) gravitational water (b) capillary water (c) hygroscopic water (d) hypertonic water
Correct Answer:
capillary water
Explanation:
Water is present in the soil in […]
The protein whose removal enables myosin to bind actin in smooth muscle is
Options
(a) tropomyosin (b) caldesmon (c) myosin light chain kinase (d) calmodulin
Correct Answer:
calmodulin
Explanation:
The protein caldesmon, originally […]
The rate of reactions exhibiting negative activation energy
Options
(a) decreases with increasing temperature (b) increases with increasing temperature (c) does not depend on temperature (d) depents on the height of the potential […]
The nitration (using nitration mixture) of aniline gives
Options
(a) p-nitroaniline (b) o-nitroaniline (c) m-nitroaniline (d) all of the above
Correct Answer:
all of the above
Explanation:
No explanation available. Be the first […]
Boron is unable to form BF₆³⁻ because of
Options
(a) high electronegativity of boron (b) high electronegativity of fluorine (c) lack of d-orbitals in boron (d) less difference in electronegativity between B and […]
CCl₄ and freons
Options
(a) are green compounds because they are green coloured (b) depletes ozone concentration (c) causes increase in ozone concentration (d) have no effect on ozone concentration
Correct Answer:
depletes […]
Tollen’s test can be used to distinguish
Options
(a) propionaldehyde and acetone (b) propanol and propionic acid (c) propene and iso-butene (d) iso-propanol and propanol
Correct Answer:
propionaldehyde and acetone
Explanation:
Propionaldehyde (propanal) […]
A nucleophilic substitution reaction proceeds through SN1 mechanism. So, the reaction is
Options
(a) unimolecular (b) bimolecular (c) termolecular (d) rate depends on concentration of incoming nucleophile
Correct Answer:
unimolecular
Explanation:
No explanation […]
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