13: Photosynthesis In Higher Plants : Neet-xi-biology

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#9-b

Cyclic and non-cyclic photophosphorylation

Ans : Cyclic and non-cyclic photophosphorylations

Cyclic photophosphorylation		Non-cyclic photophosphorylation
1.	It occurs only in photosystem I.	1.	It occurs in photosystems I and II.
2.	It involves only the synthesis of ATP.	2.	It involves the synthesis of ATP and NADPH₂.
3.	In this process, photolysis of water does not occur. Therefore, oxygen is not produced.	3.	In this process, photolysis of water takes place and oxygen is liberated.
4.	In this process, electrons move in a closed circle.	4.	In this process, electrons do not move in a closed circle.

#9-c

Anatomy of leaf in C₃ and C₄ plants

Ans : Anatomy of the leaves in C₃ and C₄ plants

C₃ leaves		C₄ leaves
1.	Bundle-sheath cells are absent	1.	Bundle-sheath cells are present
2.	RuBisCo is present in the mesophyll cells.	2.	RuBisCo is present in the bundle-sheath cells.
3.	The first stable compound produced is 3-phosphoglycerate -a three-carbon compound.	3.	The first stable compound produced is oxaloacetic acid - a four-carbon compound.
4.	Photorespiration occurs	4.	Photorespiration does not occur