Multiple Choice QuestionsIn a ring girdled plant
the shoot dies first
the root dies first
the shoot and root die together
the shoot and root die together
B.
the root dies first
In a ring girdled plant, the root dies first. A ring of bark is cut from the stem. It also removes phloem. Nutrients collect above the ring where the bark also swells up and may give rise to adventitious roots. Growth is vigorous above the root. The tissues below the ring not only show stoppage of growth but also begin to shrivel (contract). Roots begin to starve first if the ring is not healed, after sometime roots will die, which will kill the whole plant.
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
The movement of a gene from one linkage group to another is called
inversion
duplication
translocation
translocation
The function of leghemoglobin in the root nodules of legumes is
oxygen removal
nodule differentiation
expression of nif gene
expression of nif gene
Carrier ions like Na+ facilitate the absorption of substance like
amino acids and glucose
glucose and fatty acids
fatty acids and glycerol
fatty acids and glycerol
The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
lignified thick walls
cohesion and adhesion
weak gravitational pull
weak gravitational pull
Passage cells are thin-walled cells found in
endodermis of roots facilitating rapid transport of water from cortex to pericycle
phloem elements that serve as entry points for substance for transport to other plant parts
testa of seeds to enable emergence of growing embryonic axis during seed germination
testa of seeds to enable emergence of growing embryonic axis during seed germination
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