Which of the following is a special feature of pollen grain of Pinus?
Important Questions on Plant Kingdom
Xylem and phloem are main conducting elements.
Pollen grains are carried by wind.
Transfer of pollen is direct.
Ovules develop into seeds after fertilisation.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason R: Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below:
Find out where transketolase and epimerase reactions occur among the following:
i) Fructose bisphosphate
ii) Sedoheptulose- Phosphate Xylulose Ribose Phosphate
iii) Ribose Phosphate Ribulose Phosphate
iv) Xylulose Phosphate Ribulose Phosphate
v) Fructose Phosphate XylulosePhosphate Erythrose Phosphate
The correct combination is
Study the following
| (I) | value | Affinity of the enzyme | Inverse measure enzyme affinity |
| (II) | Hydrolases | bonds | Linking compounds |
| (III) | Transferases | Transfer of a group | Inhibitor of reaction |
| (IV) | Emil Fisher | Lock and key hypothesis | Formation of ES complex |
The correct combinations are
