the leaves of cactus are modified into thorns
The spine primordia is produced at the base of the axillary bud's shoot apical meristem; the … Numerous plants have spines of course, but in cacti, spines occur in clusters in the axil of leaves, even though the leaves are usually microscopic. What is the function of thorns? 2 ... Answer: Spines are modified leaves which have less surface area. Cactus spines occur in clusters in the axil of leaves. 6. A group of spines is termed an areole. Leaves modified for Reproduction: Typically, leaves are determinately growthed. mechanical defense. Why leaves of desert plants are modified into thorns? Soft, broad leaves might be good at photosynthesis, but they lose a lot of water due to evaporation. Cactus Spines Are Modified Leaves. Plants lose water through their leaves. Leaves are modified into spines : Opuntia Stem has sharp thorns : _______ Spines for Defence: The non-photosynthetic leaves of cacti have become modified for defence. Main menu Back Next Back to vegetative parts main menu Back to stem and leaf modification menu Thorns, Spines and Prickles Cactus spines Cactus spines are usually modified leaves or shoots located in the axil of a leaf. 4.25) the minute leaves of the axillary bud are modified into spines. The grow, function and then die without sustaining new growth. Cactus spines are actually heavily modified leaves, although they don’t have any of the same structures that are found in normal leaves and are completely inert. Cactus spines are modified 1) LEAVES. Tendrils: In peas the terminal leaflet of the leaf has become modified into a tendril for climbing. Over time, cacti modified them into clusters of sharp spines or hairs. honeylocust. Ma'am as in the class we have studied the venation of leaves so in cactus as you know that the leaves are modified into spines or thorns so for example i am explaing a child that the leaves having parallel venation will have fibrous roots and the leaves having reticulate - Science - Getting to Know Plants Cactus leaves are modified, because they're characterized by smaller surface areas. These new leaves were good at two things: avoiding water loss and protecting the plant (On this topic, I wrote a post on why cacti adapted to have spines instead of leaves). Thus, spines lose less water and … In deserts, that is something that plants should avoid, so that they can store water. Most cactus morphologists have concluded that cactus spines are either modified leaves or modified bud scales (the difference is inconsequential because bud scales themselves are modified leaves). above-ground roots arising from the stem that can grow through the air and extend down into the soil ~provide extra absorptive capacity and anchorage/stability for the plant ... What kind of modified stem are thorns? Those cactus plants that have modified leaves have them as thorns, spines, spikes, quills, prongs or bristles. Thus, in prickly pear (Opuntia; fig. Complete the given analogy. Cacti have adapted to the harsh conditions they live in by developing areoles instead of branches and spines instead of leaves. Cactus spines are also known as modified bud scales, which also are modified leaves. 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