Question

Agranal chloroplasts are characteristic of

• A. Mesophyll of pea leaves
• B. Bundle sheath of mango leaves
• C. Mesophyll of maize leaves
• D. Bundle sheath of sugarcane leaves

Answer 1

The correct option is D Bundle sheath of sugarcane leaves

• Chloroplasts from the leaf mesophyll cells of C4 plants exhibit grana similar to higher plant chloroplasts.
• Originally it was thought that the chloroplasts of C4 bundle sheath chloroplasts were agranal.
• This assumption was supported by the observation of chloroplast ultrastructure of C4 plants such as corn and sugarcane. But a further evaluation of many C4 plants showed that bundle sheath chloroplasts often possess grana.
• Maize is a C4 plant and mesophyll of maize contains granal chlorophyll. Thus, option C is wrong.
• Sugarcane is a C4 plant and bundle sheath of sugar cane leaves contains agranal chlorophyll.
• Pea and mango are C3 plants which contain granal chloroplasts.
  

Thus, option D is correct.