Palisade parenchyma is absent in leaves of
a. Gram
b. Sorghum
c. Both A and B
d. Soybean

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Hint: Palisade parenchyma is a constituent mesophyll cell of dicot leaf. Cells of Palisade parenchyma are elongated , vertically placed and run parallel to each other. These cells take part in photosynthesis.

Complete answer:
> Gram :- Gram may be a dicotyledonous seed so differentiation of mesophyll is seen here. This option is not correct.

> Sorghum :- sorghum may be a monocotyledonous seed so differentiation of mesophyll is not seen here. The mesophyll cells of leaves are not differentiated in monocots. So palisade parenchyma is not present in their leaves. So , this option is correct.

> Both A and B :- option A is gram that is dicotyledonous seed and sorghum is monocot so only b is correct.

> Soybean :- soybean is a dicotyledonous seed. Differentiation of mesophyll is seen. So this option is incorrect

Hence, The correct answer is option (B).

Additional information:
- Palisade parenchyma is also called palisade mesophyll. Palisade cells are a kind of parenchyma cells that contain most of the chloroplasts in plant leaves. Palisade cells are a kind of cells that absorb light required for photosynthesis.
- Their function is to enable photosynthesis to be administered and performed efficiently and for that they have several adaptations.
- The formation of spongy and palisade parenchyma is usually due to the differentiation of mesophyll cells of leaf in dicots leaf. Mesophyll is not seen to be differentiated in monocots.
- The differentiation is typically not seen in monocots but seen in dicots.

Note: Sorghum (family-Poaceae) is a monocot plant. Monocot leaf is Also known as Isobilateral leaf and dicot leaf is Also known as dicotyledonous roots. In dicots stomata are more concentrated on lower epidermis. In monocots stomata are present equally on upper and lower epidermis
Dorsiventral leaves are main characteristics of dicots. In an isobilateral leaf, mesophyll is ground tissue that happens between the two epidermal layers.