Direction: In the following questions, a statement of assertion (A) i...
The functions of the parenchymatous tissue is store food material in the form of starch, proteins, oils and fats. The parenchymatous tissues in root and stem tubers are good examples. The xylem and phloem parenchyma also store starchy food. The parenchymatous cells that contain chloroplasts are the main seats of photosynthesis, e.g., palisade cells of leaf.
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Direction: In the following questions, a statement of assertion (A) i...
Assertion: Parenchyma cells help in storage of food.
Reason: Parenchyma cells are the main seats of photosynthesis.
Explanation:
Assertion (A) is true but reason (R) is false.
- Parenchyma cells are a type of simple plant cells that are alive at maturity and have thin cell walls. They are found in various parts of the plant, such as leaves, stems, roots, and fruits.
- One of the functions of parenchyma cells is the storage of food. These cells can store various substances such as starch, oils, proteins, and water. They act as reservoirs for the plant, storing nutrients and energy for later use.
- However, the reason given in statement (R) is incorrect. Parenchyma cells are not the main seats of photosynthesis. The main cells responsible for photosynthesis are the specialized cells called mesophyll cells, specifically the palisade mesophyll cells in the upper layer of the leaf.
- Palisade mesophyll cells contain a high number of chloroplasts, which are the organelles responsible for photosynthesis. These cells are elongated and tightly packed, maximizing the absorption of sunlight for energy conversion.
- While parenchyma cells may also have some chloroplasts and can participate in photosynthesis to some extent, they are not the primary sites of photosynthesis in plants.
- Therefore, while the assertion that parenchyma cells help in the storage of food is correct, the reason that parenchyma cells are the main seats of photosynthesis is incorrect. Thus, option (B) is the correct answer.
Key points:
- Parenchyma cells help in storage of food.
- Parenchyma cells are not the main seats of photosynthesis.
- Palisade mesophyll cells are the primary sites of photosynthesis.
Direction: In the following questions, a statement of assertion (A) i...
B
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