The gas exchange surface in an earthworm is
Options
(a) tracheae (b) gills (c) skin (d) ctenidia
Correct Answer:
skin
Explanation:
No explanation available. Be the first to write the explanation for this […]
The function of leghaemoglobin in the root nodules of legumes is:
Options
(a) inhibition of nitrogenase activity (b) oxygen removal (c) nodule differentiation (d) expression of nif gene
Correct Answer:
oxygen removal
Explanation: […]
The formula of chlorophyll-a is
Options
(a) C₅₆H₇₀O₆N₄ Mg (b) C₅₅H₇₂O₆N₄ Mg (c) C₅₅H₇₂O₅N₄ Mg (d) C₅₂H₇₀O₅N₄ Mg
Correct Answer:
C₅₅H₇₂O₅N₄ Mg
Explanation:
Chlorophyll ‘a’ has molecular formula of C₅₅H₇₂O₅N₄ Mg . Its […]
The form of pigment which promotes germination is
Options
(a) P₇₆₀ (b) P₇₃₀ (c) P₆₅₀ (d) P₇₆₀ & P₇₃₀ & P₆₅₀
Correct Answer:
P₆₅₀
Explanation:
No explanation available. Be the first to write […]
The fluid mosaic model of plasma membrane visualizes the central bilayer composed of phospholipids with their spherical polar heads
Options
(a) directed opposite of their surface (b) directed to their surface (c) directed […]
The fluid mosaic model of bio membrane was proposed by
Options
(a) Watson and Crick (b) Singer and Nicolson (c) Danielli and Davson (d) none of the above
Correct Answer:
Singer and Nicolson
The fixation and reduction of CO₂ occur in presence of
Options
(a) ATP (b) ATP and NADPH (c) NADPH, chlorophyll and water (d) ATP, NADPH and light
Correct Answer:
ATP and NADPH
Explanation: […]
The first step of photosynthesis is
Options
(a) excitation of electron of chlorophyll by a photon of light (b) formation of ATP (c) attachment of CO₂ to 5 carbon sugar (d) ionisation of […]
The first step in dark reaction of photosynthesis is
Options
(a) formation of ATP (b) ionization of water (c) attachment of CO₂ to a pentose sugar (d) excitement of electron of chlorophyll by […]
The first stable product of photosynthesis in C₄ plants is
Options
(a) phosphoglyceric acid (b) ribulose-1-5-bisphosphate (c) PGAL (d) malic acid
Correct Answer:
malic acid
Explanation:
In C₄ plants the leaf cells have […]
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