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Question

Why do cacti have so many thorns?

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Solution

Cactus

A plant that belongs to the family Cactaceae is known as a cactus. Cacti may be found in a wide range of forms and dimensions. The vast majority of cacti are found in habitats that experience periods of dryness to varying degrees. It makes their home in dry environments, such as the Atacama Desert, which is consistently ranked as one of the driest regions on the globe.

Cacti have developed a wide variety of strategies to preserve water. Succulents are almost exclusively made of cacti. This classification denotes that succulents have swollen, fleshy sections that have evolved to hold water. The process that is essential to the life of most cacti takes place only in the stem, in contrast to the majority of other succulents.

Functions of Thorns on Cactus

Spines on cacti play a crucial role in the plant's defence against predators, including humans and other animals. The vast majority of cactus species do not have real leaves or branches on their plants. Instead, they have highly modified branches that are referred to as areoles. These areoles are the little bumps that spines develop from. The spines on cacti are highly modified leaves.

Therefore, spines serve several purposes, which enable cacti to flourish in the harsh settings of deserts. They shield the plant from the attack of predators, give shade, aid in temperature regulation, contribute to the reduction of water loss, and even assist the plant in its ability to spread and reproduce.

To know more about the difference between prey and predator, click here.

Thus,

  • The cactus is a xerophyte growing in arid conditions.
  • Leaves modify themselves in the form of thorns so that their surface area gets reduced.
  • This reduces the exposure of stomata.
  • This helps in reducing water loss by transpiration.

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