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Which of the following is not an adaptive modification in a xerophytic plant?
Strongly developed sclerenchyma
Sunken stomata
Sparse stomata
Presence of lacunar tissues
Answers (1)
The presence of lacunar tissues is not an adaptive modification in a xerophytic plant.
Xerophytic plants are plants that have adapted to arid or dry environments. They have evolved various adaptive modifications to cope with limited water availability and reduce water loss. Some common adaptive modifications in xerophytic plants include:
Reduced leaf surface area: Xerophytes often have smaller leaves or modified leaf structures, such as spines or scales, to minimize water loss through transpiration.
Thick cuticle: The outermost layer of the leaves, known as the cuticle, is thicker in xerophytes, acting as a barrier to reduce water loss.
Sunken stomata: Xerophytic plants often have stomata, which are tiny openings on the leaf surface for gas exchange, located in sunken depressions or pits. This positioning helps to reduce the exposure of stomata to direct airflow and reduces water loss.
CAM or C4 photosynthesis: Some xerophytic plants have specialized pathways for photosynthesis, such as Crassulacean Acid Metabolism (CAM) or C4 photosynthesis. These pathways enable more efficient carbon dioxide uptake and minimize water loss during photosynthesis.
Lacunar tissues, on the other hand, are not specifically associated with xerophytic adaptations. Lacunae are air-filled spaces within plant tissues that can serve various functions, such as providing structural support or aiding in gas exchange. While lacunar tissues may exist in certain plant species, they are not considered a specific adaptation to arid or dry environments.
Hence, the correct answer is option 4.
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