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Thorns, Spines and Prickles Cactus spines Cactus spines are usually modified leaves or shoots located in the axil of a leaf. Over time, cacti modified them into clusters of sharp spines or hairs. Tendrils: In peas the terminal leaflet of the leaf has become modified into a tendril for climbing. The leaf-apex in date-palm, dagger plant (Yucca) etc., is so modified, while in plants like prickly or Mexican poppy (Argemone), Amercian aloe (Agave), Indian aloe (Aloe), etc., spines develop on the margin as well as at the apex. 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? 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). honeylocust. The spine primordia is produced at the base of the axillary bud's shoot apical meristem; the … Why leaves of desert plants are modified into thorns? Leaves modified for Reproduction: Typically, leaves are determinately growthed. Cactus spines are also known as modified bud scales, which also are modified leaves. Cactus spines are modified 1) LEAVES. What is the function of thorns? Cacti have adapted to the harsh conditions they live in by developing areoles instead of branches and spines instead of leaves. Cactus leaves are modified, because they're characterized by smaller surface areas. Cactus Spines Are Modified Leaves. 6. In deserts, that is something that plants should avoid, so that they can store water. A group of spines is termed an areole. Complete the given analogy. Leaves are modified into spines : Opuntia Stem has sharp thorns : _______ Plants lose water through their leaves. Thus, in prickly pear (Opuntia; fig. Main menu Back Next Back to vegetative parts main menu Back to stem and leaf modification menu The grow, function and then die without sustaining new growth. 2 ... Answer: Spines are modified leaves which have less surface area. Thus, spines lose less water and … Cactus spines occur in clusters in the axil of leaves. 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. Those cactus plants that have modified leaves have them as thorns, spines, spikes, quills, prongs or bristles. 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). mechanical defense. Soft, broad leaves might be good at photosynthesis, but they lose a lot of water due to evaporation. 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