The spine is technically a modified, sharp-pointed leaf. Since it has a bud in its axil, the spine occurs in the relative position of a leaf. Some spines are called “stipular spines” because they are modified, sharp-pointed stipules at the base of a leaf.
Which is a modification into the spine in a cactus plant a stems B leaves C buds?
Answer: The correct answer is leaves, spines are modified leaves. Explanation: Cactus have spines, the thorn-like thing, in which replace leaves.
Are the leaves of cactus plants modified into spines?
Its leaves are modified to extremely small-sized spines to minimize the surface area from which water can be lost. Its stem takes up the role of photosynthesis thus allowing it to survive in deserts. Hence, the Cactus is the correct answer here.
What are 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 is the stem of cactus thick and green?
I wish this helps. Explanation: Cacti have a thick, hard-walled, succulent stem – when it rains, water is stored in the stem. … Plants of Cactus have thick fleshy and green stems because there is water stored in them.
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.
Why are leaves modified into spines in prickly pear?
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 leaves are 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.
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.
Which part of the cactus plant is modified as spines and why are they modified?
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.
How does the presence of spines instead of leaves in desert plants useful?
Desert plants lose very little water through transpiration. The leaves in desert plants are either absent, very small, or they are present in the shape of spines. This helps in reducing loss of water from the leaves through transpiration.
What is the advantage of green and fleshy stem of cactus?
Answer: The advantages of green and fleshy stem of cactus is that it stores water for people of deserts.