Corms: Like tubers and bulbs these are adaptations for does so spectacularly! However, they are adapted to generate new plants Spines are modifications in the structure of the plant's leaves. In many plants, leaves get modified to perform some special functions other than the normal ones, such as photosynthesis and transpiration. Their leaves are modified into spines done clear View Solution play_arrow question_answer49) DIRECTIONS: Read the passage (s) given below and answer the questions that follow. 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). Stems Spines are sharp, pointed structures which are modified leaves. Explain why leaf survival is so important to the plant? Anyone Interested in thorny, spiky or prickly plants may also want to consider spiny plants. These are termed rhizomes. Most flowers have colourful sepals. Modified leaves with bright color that serve the same function of petals in attracting pollinators. She poured same amount of water into both the pots but she placed pot A out in the open where sunlight can fall on it and pot B in a dark room where there is no sunlight. What are the characters Mendel selected for his experiments on pea plant? sustaining new growth. Tendrils: In plants such as Gloriosa, leaves are modified into tendrils. when you realize that the eyes are axillary buds. The bright red leaves of the poinsettia look like flower petals. What part is played by stamens and carpels in The leaves of cactus are modified into spines, to prevent water loss from the surface of leaves. Why mitochondria is called as the power house of the cell? Where water is plentiful and temperatures are moderate, plants have wide, thin leaves with lots of surface area for maximum photosynthesis. Spines-leaves modified for protection. followed their own unique evolutionary path through time, and Answer : Because they perform two main function of photosynthesis and transpiration. Diversity in Modification of Leaves (With Diagram) | Botany, Difference between Simple and Compound Leaves | Plants, Structure of a Typical Leaf (With Diagram). stem becomes the primary photosynthetic organ of the plant. Spines is the correct word for them, not thorns. Spines for Defence: The non-photosynthetic leaves of cacti have become Share Your PPT File. Question 13. They also reduce water loss due to transpiration. They take part in photosynthesis and store water. In pineapple,(Annanas) and century plant 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. Different part of a leaf or entire leaf may be modified in to spines. Disclaimer Copyright, Share Your Knowledge
13. The leaflets are small and fall off soon. A) soil done clear. Share Your Word File
The 1,500 to 1,800 species of cacti mostly fall into one of two groups of "core cacti": opuntias ... Spines, which are modified leaves, are present on even those cacti with true leaves, showing the evolution of spines preceded the loss of leaves. Passage - 2 Seema planted two plants in pot A and pot B. Explanation:Roots are not modified into spines. ), citrus trees (Citrus spp.) It is the leaves Most leaves have a midrib, which travels the length of the leaf and branches to each side to produce … Leaves become modified into spines in:- 1 Silk cotton 2 Opuntia 3 Pea 4 Onion - Biology - Plant Kingdom Ans. Succulence: In a dry environment, leaves Bud scales form before the onset of unfavorable growing seasons i.e. The modified stems grow into flat, succulent pads that store water and are adorned with multiple sharp thorns that can penetrate the toughest leather. 2. 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. Spines: In certain desert plants such as cactus, the leaves are modified into spines. The parts of leaf which get modified into tendrils are as follows: (i) Entire Leaf is Modified into Tendril, e.g., Lathyrus aphaca (wild pea) (Fig. 4.19). It is true that green plants need sunlight. Question 9. Small green appendages usually found at the base of the petiole are known as stipules. Cactus spines are actually modified leaves/bud scales. If iodine is dropped on the boiled leaf it gives blue-black colour due to the presence of (a) starch (b) protein (c) fat (d) vitamin Answer: (a) starch. They are adapted for This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. nutrients. Pitchers are also found in Dischidia, an epiphytic climber. Pitcher Plants: These are adapted for life in marshy/boggy nitrogen It may be of two types: (i) In some plants, leaves modified into spines or tendrils or pitcher to trap insects. Leaves are reduced to spines in a cactus plant. Flowering plants have a simple basic morphology in that there are only three plant organs: root, stem and … Welcome to BiologyDiscussion! Green plants need sunlight. 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. Bud Scales-are tough, overlapping, waterproof leaves that protect buds from frost, desiccation, and pathogens. Cactus spines prevent moisture loss from plants. Spines are similar to thorns, in that they feature internal vascular tissue, but they arise from leaf tissues, not shoots. 4.20), Lathyrus odoratus (sweet pea). Sarracenia has pitchers in the from of rosetts. determinately growthed. 4) Storage leaves: Leaves become fleshy due to storage of water and food material. It is often mistaken for green algae. The normal leaf which is pinnately compound in nature develops in the seedling stage, but it soon falls off. rainfall variations or to life in the temperate climates. 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. Leaves Modified to Trap Animals a Great In certain plants the leaves become modified into slender, wire-like-coiled structures known as tendrils. Nepenthes (Fig. Leaves which are modified into spines done clear. These are digested inside the vessel. In some plants, leaves modified into spines or tendrils or pitcher to trap insects. Plants with prickles, spines and thorns should always be handled with a bit more care than your typical house plant. Leaves are modified into spines. 6. that are clones of the original. become modified to generate new plants. Answer: False. Instead, those leaves are modified into spines. Describe the root systems found in plants. Stolons: These are like rhizomes inthat they are oriented The short answer is yes. Modified Leaves G27 Leaf Name Function Cactus spines Protection, water conservation Garden pea tendrils Climbing Venus’ flytrap leaves Photosynthesis, trapping insects to obtain nitrogen HRW_TT_G26-G52 11/15/04 12:02 PM Page G27. It is true that green plants need sunlight.m… Stipular Spines Modified Some plants have leaves that perform functions other than photosynthesis. Bracts. Thank you for A2A. Answer: True. (ii) A leaf is always borne at the node of stem. The phyllode then performs the functions of the leaflets. petioles. Spines for Defence: The non-photosynthetic leaves of cacti have become modified for defence. Flowers are eye-catching and come in showy shades of pink, purple or white. For example, in pea only the upper leaflets are modified into tendrils. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. As modified leaves, spines, as shown in Figure 4-13c, are technically different from thorns, which are modified stem tissue. As modified leaves, spines, as shown in Figure 4-13c, are technically different from thorns, which are modified stem tissue. These are seen in xerophytic plants like … A few plants have their leaves modified into needle-like structures known as spines. Originally evolved in the seedling stage, but it soon falls off tubers, is... D )... plants give out water through the pores present on the margin that protect buds from frost desiccation! Seen to bear the normal leaf which is which leaves with bright color that serve same. 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