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[A]: Senescence effect can be reversed b...

[A]: Senescence effect can be reversed by cytokinin.
[R]: The loss of liquid from leaves of intact plant is termed as guttation.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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[A]: Senescence is induced by the applica- tion of cytokinin in plants. [R]: Cytokinin promotes the breakdown of chlorophyll, proteins and nucleic acid.

(i) The deficiency of any element can cause multiple symptoms. (ii) Same symptoms may be caused by the deficiency of one or several different elements. (iii) The concentration of the essential element below which plant growth is retarded is termed as critical concentration. Chlorosis is the loss of chlorophyll due to deficiency of N, K, Mg, Fe, S, Mn, Zn Mo. Different plants respond differently to the deficiency of the same element. How many of the above statement are correct?

[A] : Virus free plants can be produced from virus infected plants by meristem tissue culture . [R] : Virus fall to grow during the growth of host tissue in the artificial medium .

[A] : Plants brought from the wild into cultivation retain original names . [R] : According to Article 29 of the code publication of new names and descriptions are effective when the printed matter is distributed to general public or to at least ten botanical institutions with libraries accesible to botanists generally .

(A]: Cytokinins help in retention of cholorophyll and delayed senescence in leaves. [R]: Cytokinins only stimulate root initiation

a] Name the mode of reproduction in following organisms and state important feature of each mode. i] planaria ii] hydra iii] rhizopus b] We can develop new plants from the leaves of Bryophyllum. Comment. c) List two advantages of vegetative propogation over other modes of reproduction.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

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  2. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

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  3. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

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  4. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

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  5. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

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  6. [A]: The water is absorbed by the root and moves into the stem. [R]...

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  7. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

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  8. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

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  9. [A]: The nitrogen content of the plant cannot be detected accurately b...

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  10. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

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  11. [A]: The evolution of molecular oxygen is concerned with photosystem-1...

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  12. [A]: Antitranspirants are material applied to plants for retarding tra...

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  13. Assertion. Calcium deficiency symptoms first appear in the apical regi...

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  14. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

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  15. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  16. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

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  17. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

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  18. [A]: The rate of transpiration is indirectly proportional to RH. [R]...

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  19. [A]: Root cells have lower OP than leaf cells. [R]: Root cells have...

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  20. [A]: Root pressure is largely responsible for ascent of sap in herbace...

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