What is the direction of movement of sugars in phloem?
Water and mineral only
Water, mineral salts and some organnic nitrogen only
Water, minerals salts and some organic nitrogen and hormones
Grass leaves curl inwards during very dry weather. Select the most appropriate reason for the following:
Closure of stomata
Flaccidity of bulliform cells
Shrinkage of aire spaces in spongy mesophyll
Tyloses in vessels
Thiobacillus is a group of bacteria helpful in carrying out:
Respiratory Quotient(RQ) value of tripalnitin is:
It takes very long time for pineapple plants to flower. Which combination of hormones can be applied to artificially induce flowering in pineapple plants through out the year to increase the yields?
Auxin and Ethyelene
Gibberellin and Cytokinin
Gibberellin and Abscisic acid
Cytokinnin and Abscisic acid
What is the site of perception of photoperiod necessary for the induction of flowering in plants?
Convesion of glucose to glucose - 6 - phosphate, the first irrevesible reaction of glycolysis, is catalysed by:
The answer to this question is hexokinase.
Which one of the following is not an essential mineral element for plants while the remaining three are?
Answer is CADMIUM . Remaining three are essential.(browsed from internet)
You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
IAA and gibberellin
Auxin and cytokinin
Auxin and abscisic acid
Gibberellin and abscisic acid
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
Low refractive index
Absence of sugar
Oxidative phosphorylation is
formation of ATP by transfer of phosphate group from a substrate to ADP
oxidation of phosphate group in ATP
addition of phosphate group to ATP
formation of ATP by energy released from electrons removed during substrate oxidation
Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
The process which makes major difference between C3 and C4 plants is