Concept notes: Cacti are plants that have adapted to survive in arid and dry conditions, such as deserts. They have thick, fleshy stems that store water and spines instead of leaves to reduce water loss. Other plants like coconut, touch-me-not, and peepal are not adapted to survive in such harsh, dry environments.
Explanation: Plants that grow in dry desert environments are known as xerophytes. These plants have evolved specific adaptations to survive in arid conditions where water is scarce. One of the most well-known xerophytes is the cactus, which is a common plant found in deserts around the world, including India.
Cacti have several key adaptations that allow them to thrive in desert conditions:
1. **Water Storage**: Cacti have thick, fleshy stems that can store large amounts of water. This stored water helps the plant survive during long periods of drought.
2. **Reduced Leaf Surface Area**: Most cacti have spines instead of leaves. Spines are modified leaves that reduce the surface area exposed to the sun, thereby minimizing water loss through transpiration.
3. **Waxy Cuticle**: The outer surface of a cactus is covered with a thick, waxy cuticle that further reduces water loss by preventing evaporation.
4. **Shallow Root System**: Cacti have a shallow but extensive root system that allows them to quickly absorb water from light rains or morning dew.
In contrast, other plants like coconut, touch-me-not, and peepal are not adapted to survive in such harsh, dry environments. Coconuts are tropical plants that require a lot of water and are typically found in coastal and humid regions. Touch-me-not (Mimosa pudica) is a plant that is sensitive to touch and is found in moist, tropical environments. Peepal (Ficus religiosa) is a large tree that requires a lot of water and is commonly found in tropical and subtropical regions.
Therefore, among the given options, the plant that is usually grown in dry desert conditions is the cactus. This makes option C the correct answer.