They have small thorns instead of leaves due to transpiration in which sun rays absorb water from the leaves . So the spines in oputina helps avoiding transpiration because cactus grow in desert and if there will be leaves cactus will lose its water.
What is the role of spines in the body of cactus?
In cacti, spines are wholly transformed leaves that protect the plant from herbivores, radiate heat from the stem during the day, and collect and drip condensed water vapour during the cooler night.
Does Opuntia have spine?
The spines present on Opuntia represent the reduced leaves. The leaf parts become modified into spines in order to protect the plants from grazing animals and excessive transpiration.
Are thorns found in Opuntia?
In Opuntia, the spines represent the reduced leaves. To protect the plants from grazing animals and excessive transpiration, the leaf sections are modified into spines. Because of transpiration, in which sun rays extract water from the leaves, Opuntia leaves spines have tiny thorns instead of leaves.
How do spines help cactus survive?
The spines on a cactus help to protect it from humans and animals. Its roots are spread out to collect water when it does rain and it stores water in its body for future use.
What is the function of spines in plant?
Answer: In certain plants entire or the parts of the leaves are modified into sharp and pointed structure called as leaf spines. … It can act as defensive structure since it can protect the plants against grazing animals. It also reduces transpiration.
What are the advantages of leaves modified into spines?
Answer: 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 does cactus modify its leaves into spine?
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 is the purpose of a thorn?
Thorns represent the modification of an axillary shoot system in which the leaves are reduced and die quickly and the stems are heavily sclerified and grow for only a limited time (determinate growth). Thorns appear to protect the plant against herbivores.
Do thorns have poison in them?
Although the thorns are not considered toxic, the skin around the puncture wound can become red, swollen, painful, and itchy. These symptoms are uncomfortable but not dangerous.
What is difference between Thorn and prickle?
Prickles are like hairs but are often quite coarse (for example, rose prickles). They’re extensions of the cortex and epidermis. … Thorns are modified branches or stems. Thorns are found to be the modification of stem and formed by axillary buds and are strong in nature as seen in Bougainvillea.
What will happen if a cactus does not have spines?
They all grow just fine. Theoretically they would be more susceptible to predation by animals because of their lack of defensive spines, but that can’t be too much of a problem because these species survive instead of being eaten into extinction.