Read the given statements and selectthe correct option.Statement 1 : C...
Crassulacean acid metabolism is a mechanism of photosynthesis involving double fixation of CO2 which occurs in succulents belonging to Crassulaceae, Cacti, Euphorbias and some other plants of dry habitats. Here, the stomata remains closed during the daytime and opens only at night, e.g Sedum,Kalanchoe,Opuntia. Sunken stomata are deep seated stomata in which subsidiary cells lie above the guard cells. So, the correct answer is 'Both statements are correct'.
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Read the given statements and selectthe correct option.Statement 1 : C...
Statement 1: Crassulacean acid metabolism occurs in succulent plants which grow in xeric conditions.
Statement 2: Stomata are generally sunken in succulent plants.
Explanation:
Crassulacean Acid Metabolism (CAM):
- Crassulacean acid metabolism (CAM) is a specialized type of photosynthesis that has evolved in succulent plants as an adaptation to xeric (dry) conditions.
- In xeric conditions, water availability is limited, and plants need to conserve water to survive.
- CAM plants, such as cacti and agave, have developed a unique mechanism to minimize water loss while still carrying out photosynthesis.
Stomata in Succulent Plants:
- Stomata are tiny openings found on the surface of leaves and stems that enable the exchange of gases (such as carbon dioxide and oxygen) between the plant and the environment.
- In succulent plants, which are adapted to xeric conditions, the stomata are generally sunken.
- The sunken stomata are located in pits or depressions on the leaf surface, which helps to reduce water loss through evaporation.
- The sunken stomata create a small microclimate that traps moist air and reduces transpiration, thus minimizing water loss.
Explanation of the Statements:
- Both statements 1 and 2 are correct.
- Statement 1 correctly states that Crassulacean acid metabolism occurs in succulent plants that grow in xeric conditions.
- Statement 2 correctly states that stomata are generally sunken in succulent plants.
- However, statement 2 is not the correct explanation of statement 1. The sunken stomata in succulent plants are an adaptation to reduce water loss, but they are not directly related to the occurrence of Crassulacean acid metabolism.
Conclusion:
- The correct option is option B: Both statements 1 and 2 are correct, but statement 2 is not the correct explanation of statement 1.
- Crassulacean acid metabolism is an adaptation in succulent plants to xeric conditions, while sunken stomata are an adaptation to reduce water loss in succulent plants.
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