Leaves of certain plants become wholly or partially modified for defensive purpose into sharp, pointed structures known as spines. Thus, in prickly pear the minute leaves of the axillary bud are modified into spines. … Their function is to protect the axillary bud that they bear in their axil.
Why are leaves modified into spines?
Leaf spines to provide protection and reduce the loss of water: In certain plants, leaves or parts of leaves get modified into pointed structures called spines. Spines help to reduce the loss of water by transpiration. They also protect the plant from grazing animals.
Why leaves of cactus are modified into thorns or spines?
The leaves of cactus are modified into spines, to prevent water loss from the surface of leaves. … Thus, the stem is the centre of photosynthesis in the cactus plants instead of the leaves.
What are the advantages of leaves modified into spines in cactus plant?
Most species of cacti have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade. In the absence of leaves, enlarged stems carry out photosynthesis.
Why are leaves modified to spines in desert plants?
Spines are modified leaves which have less surface area. Plants lose water through their leaves. In deserts, that is something that plants should avoid, so that they can store water. Thus, spines lose less water and are more advantageous in dry climates.
Are modified into spines in?
Leaves are modified into spines to reduce the surface area and minimize the rate of water loss by evaporation and transpiration. This modification protects the plant from grazing animals.
Is aloe vera a modified leaf?
Aloe Vera Leaves
Aloe vera leaf modification allows the plant to store water and thrive in dry climates. The leaves of the aloe vera plant are thick. A large amount of pulp inside the leaf stores both water and nutrients for the plant to thrive, advises the University of Wisconsin LaCrosse.
What is the purpose of a modified cactus?
The leaves of cactus plant are modified into spine because it helps them to lose less water during transpiration and also protect from beings eaten by animal.
Which modified form of a leaf reduce loss of water from the plant?
A waxy layer known as the cuticle covers the leaves of all plant species. The cuticle reduces the rate of water loss from the leaf surface.
What are the two main functions of leaves?
The two main functions performed by the leaf are photosynthesis and transpiration. Photosynthesis is the process by which green plants make their food from carbon dioxide and water in the presence of sunlight.
In which leaves are modified into spines?
Leaves are modified into spines in Opuntia (xerophytes) so as to reduce the surface area and minimize rate of water loss by evaporation and transpiration. Besides, they also provide protection to the plant from grazing animals.
In which of the following plant leaves are modified as spines?
Opuntia is a xerophytic plant. It grows in the dessert where water is very limited. In it, the leaves of areoles are modified into sharp and pointed spines. Their main function is of protection.