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Assertion : Photorespiration is a useful...

Assertion : Photorespiration is a useful process where there is no synthesis of ATP energy.
Reason : RuBisCO is present in mesophyll cells of `C_(4)` plants, hence they show more productivity.

A

If both are true with reason being correct explanation

B

both true but reason is not correct explanation

C

assertion is true but reason is wrong

D

both are wrong.

Text Solution

Verified by Experts

The correct Answer is:
C
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Photorespiration is the process by which light is used to release the stored energy in carbohydrate molecules to perform all work in plant cells .

Assertion : C_(4) photosynthesis is more sensitive to low temperature as compared to C_(3) photosynthesis . Reason : the rubisco found in C_(4) plants is more sensitive to low temperature as compared to C_(3) plants.

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Assertion : Under conditions of high light intensity and limited CO_(2) supply, photorespiration has a useful role in protecting the plants from photo oxidative damage. Reason If enough CO_(2) is not avilable to utilize light enregy for carboxylation to proceed, the excess energy may not cause damage to plants.

Assertion: C_(4) photosynthetic pathway is more efficient than the C_(3) pathway. Reason : Photorespiration is suppressed in C_(4) plants.

Assertion: Photosynthetically C_(4) plants are less efficient than C_(3) plants. Reason: The operation of C_(4) pathway requires the involvement of only bundle-sheath cells.

Assertion: In C_(4) plants, the bundle sheath cells are rich in an enzyme phosphate carboxylase-oxygenase (PEP case). Reason: In C_(4) ,the mesophyll cells are rich in an enzyme ribulose bisphosphate carboxylase-oxygenase(RuBisCo)

Assertion. Efficiency of C_(4) plants is more than that of C_(3) plants Reason. C_(4) plants are more efficient in picking of CO_(2) (a) If both the with reason being correct explanation (b) both are true with reason being not correct explanation (c) assertion is true but reason is wrong (d) both are wrong

Match List-I with List-II and select the correct answer using the codes given below the lists {:(,"List-I",,"List-II"),(A.,"The amount of energy accumulation in green plants through the process of photosynthesis",1.,"Gross primary productivity"),(B.,"The total organic matter synthesized by the producers in the process of photosynthesis per unit time and area",2.,"Primary productivity"),(C.,"Rate of storage of organic matter in plant tissues in excess of the respiratory utilization during the measurement period",3.,"Secondary productivity"),(D.,"Rate of energy storage at consumer level",4.,"Net primary productivity"):}

Q. Identify the correct statement (s) in relation to C_(4) photosynthesis (a) Kranz anatomy is an essential feature for C_(4) plants (b) C_(4) plants have higher water use efficiency than C_(3) plants (c) Photorespiration is minimised in C_(4) pathway (d) Conversion of oxaloacetate to malate occurs in bundle sheath cells