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The waxy surface of the floating leaves of the hydrophytes prevents [Orissa JEE 2005] A) Respiration done clear. 4. C) Plant growing in water (hydrophytes) or on another plant (epiphytes) or in another plant (parasites) are devoid of root-cap. Hence it is also called CALYPTRA. Types of root system • Tap root system The central main axis is called tap root. 5. As a result of which root cap is absent in hydrophytes. The root caps of vascular hydrophytes are typically elongated and sheath-like (root pockets) or may also be totally absent (e.g., Azolla). A) Hanging prop root of Banyan done clear. 08 www.gangwarinstitute.com Contact : 8400-582-582, 8604-582-582. The stem is soft, thin and flexible in hydrophytes. Vascular tissue in flowering plants develops from. The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. D. Roots, stems, and leaves. The thick waxy layer covers the surface of aerial organs is called Cuticle. ... totally absent in hydrophytes In: Nymphaea, special type of star shaped lignified cells (asterosclereids) present which will provide mechanical support. By definition, succulent Ø Root hairs are ephemeral (= short lived) structures. § It produces cluster of fine thread like structures known as root hairs. Ø In herbaceous plants, the epidermis … As hydrophytes are generally aquatic plants, no such protection is needed for their roots. 22. NSC Trainee Mate 2018 Agriculture Exams Study Material Agronomy Horticulture Plant Pathology Entomology Plant Breeding Genetics Current Affairs 1. In hydrophytes root cap is absent. A group of inactive cells present between the dermatogen and calyptrogen is called quiescent centre. Roots are generally fibrous type and adventitious, unbranched or sparsely branched. The root cap protects the growing tip of roots from soil and hard rock surface. 3. Write its adaptations. It is thin in Mesophytes and highly thick in xerophytes. so maximum growth in root takes place behind the apex. The stem is long, slender, weak, spongy and flexible type in submerged hydrophytes… Generally, root cap is single layered but in pandanus (screw pine) root cap is multilayered. • In free floating hydrophytes root pockets are present. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are evolved, and in submerged plants such as Vallisneria, Hydrilla, etc., 2. Roots with well -developed root cap. Root caps usually absent. Root hairs are absent. What are Hydrophytes? Zone of atomosphere near the ground is (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Homosphere. D) Submerged hydrophytes done clear. Due to presence of root cap position of root apex is sub terminal. Leaves in hydrophytes are thin and ribbon like. In some xerophytes, the stem consists of ridges. In hydrophytes, root cap is absent. This may probably be the reason why roots in hydrophytes are reduced or absent. Ø Root hairs absorb nutrients and water from the soil. Plants found in places where excess of water is present are called hydrophytes. Leaf – The leaves of suspended and submerged hydrophytes are either diss ected [ Hydrilla and Ceratophyllum] or long, soft and ribbon like [Vallisnaria]. 2. Secondary growth absent. Answer (d) The main function of root-cap is to protect the growing apex from soil particles. In place of root cap, root pocket is pre sent which is fil led by air. Q.34. C) Xerophytes done clear. (iii) Region of Root Hairs: This region is present above the region of elongation. MERISTEMATIC ZONE. In many plants, stomata are found only on thee lower surface of the leaf. QUIESCENT CENTRE I. Subgroup: Free Floating Hydrophytes . (iii) Epidermis usually lacks cuticle or peri­derm (suberised cork ceils) and stomata are gene­rally absent in the submerged organs. (iv) The reduction of absorbing tissue The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. § Root hairs arise from the epidermal cell hence it … (iii) True root caps are absent in some free floating hydrophytes and in lieu of that they develop root pockets or root sheaths which protect their tips from injuries. 75. Such plants develop the following morphological and anatomical adaptations. Ans. Write your comments here: Name *: Email: Alert me © 2012-2020 by GeekMCQ™ Technologies. (a) Only in the radical (b) Only in adventitious root. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are evolved, and in submerged plants such as Vallisneria, Hydrilla, etc., water dissolved mineral salts and gases 5. Root cap is absent in (1) Xerophytes (2) Hydrophytes (3) Mesophytes (4) Halophytes 76. Q2. Root pocket present instead of root cap which protect roots from injury, holds the roots downward and act as water reservoir. The root pockets replace the root hairs. Root cap is absent in a. Mesophytes b. Xerophytes c. Hydrophytes d. Halophytes 25. View Solution play_arrow; question_answer15) The root that never does primary function is ... A root cap is absent in the root of . Start studying Morphology of Flowering Plants. Q60. Atmosphere consists of 3. Dependent sporophyte c. Free-living gametophyte d. Haplontic life cycle This is the meristematic region of the root which produces new cells by cell division. Ø Root hairs increase the surface area for absorption. It is present just above the root cap. Q1.The apical meristem of the root is present. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are evolved, and in submerged plants such as Vallisneria, Hydrilla, etc., water dissolved mineral salts and gases are absorbed by their whole surface. Roots caps may be absent or root pockets are present (eichornia). [Karnataka 2003] 7. Epistomatous and astomatous conditions are associated with a) Hydrophytes b) Xerophytes c) Halophytes d) Mesophytes Which one of the following is a well-developed tissue present in hydrophytes? A root-cap is usually absent in the roots of (a) Hydrophytes (b) Epiphytes (c) Parasites (d) All of the above. Root cap contain more amount of golgi body which secrete mucilage which make the root slimy. Which one of the following is considered important in the development of seed habit? (ii) Region of cell elongation : The region of cell division lies partly within and partly beyond the root cap. It is because excess salt and sugar (1) plasmolyse the microbial cells (2) cause rupturing of microbial cells (3) cause change in the shape of microbial cells (1) Roots : (i) Root system is very much reduced in some floating plants (Wolffia, Utricularia) and in submerged plants (Ceratophyllum) the roots are absent. iii. Prop/pillar roots 19 Name the adventitious roots found in sugarcane and maize. Root cap is absent in (a) Halophytes (b) Hydrophytes (c) Xerophytes (d) Homophytes [R.P.M.T. Palisade parenchyma is absent in leaves of .. It is absent in hydrophytes, epiphytes, parasites and mycorrhiza. It is made up of waxy substance called cutin. In hydrophytes root cap is absent. In hydrophytes (like Pistia, Lemna and Eichhornia) root pocket is present instead of root cap. Root cap (also known as calyptra due to its origin from calyptrogen) is a cap like structure made up of thin walled cells that covers the root apex. Root Hair Zone § It is present above elongation zone. Learn vocabulary, terms, and more with flashcards, games, and other study tools. B) Photosynthesis done clear. C) Note : Root cap is absent in Eichhornia . B) Young root. • Root cap is made up of a dead tissue called CALYPTROGEN. The root caps are absent in parasites and mycorrhizal roots. Adding salt and sugar to food substances helps in preserving them for a longer duration. 2. The root-system in hydrophytes is poorlyevolved and root hairs and root cap are absent. The leaves of the floating hydrophytes are broad while those of the submerged plants are dissected or ribbon shaped. a. Heterospory b. Region of maturation : From this region some of the epidermal cells form very fine and delicate, • It is also well developed in mesophytes and xerophytes, absent in hydrophytes. In hydrophytes root cap is absent eg. The root cap is absent in some parasitic plants and some aquatic plants, in which a sac-like structure called the root pocket may form instead. Generally root cap is single layered but in Pandanus (screw pine), root cap is multilayered. In some plants like Lemna, roots perform the act of balancing the plant body. Root cell walls usually remain abnormally thin. Example: hydrilla, lotus etc. Root cap contain more amount of golgi body which secrete mucilage which makes the root slimy. Root cap is absent in (A) Lithophytes (B) Hydrophytes (C) Xerophytes (D) Mesophytes CORRECT ANSWER: B SOLUTION: Root cap is absent in adventiitous epiphytic roots of orchids, aquatic plants, parasites. It is absent in hydrophytes and underground organs. (iv) If roots are present they are always of adventitious type e.g., Nymphaea, Nelumbo etc. Fixed floating hydrophytes done clear. Morphological Adaptive feature: Root: Root system fibrous and adventitious with dense and adequate volume, which helps to maintain its balance with the aerial part. 12. Hydrophytic Adaptations are: i. Root system is not well developed. Hydrophytes are the plants that grow in watery places or the places which remain wet throughout the year. The root system in hydrophytes is feebly developed and root, root hairs and cap arq absent. (a) Periblem (b) Phellogen (c) Dermatogen (d) pleorome Q3. 3. ii. Root cap is absent in [BHU 1994, 2000] - 3419261 Root cap is absent in [BHU 1994, 2000] A) Hydrophytes B) Lithophytes C) Xerophytes D) Mesophytes 2002] 6. Ø Root hairs are absent in the exact tip portion of the root. Root hairs are absent (lemna) or feebly developed. a) Aerenchyma b) Collenchyma c) Stomata d) Root system Root cap is absent in [RPMT 2002; Manipal 2005] A) Halophytes done clear. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are developed, and in submerged plants such as Vallisneria, Hydrilla etc., water dissolved mineral salts and gases are absorbed by … B) Stilt root of Pandanus done clear. 10 . Hope this information will clear your doubts about the topic. Root hairs and root cap are absent. Generally root cap is single layered by in pandanus (screw pine) root cap is multilayered. Pistia. Root pockets are also the root caps present in hydrophytes. Note : 1. 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