Fixed floating hydrophytes done clear. Leaves in hydrophytes are thin and ribbon like. The root pockets replace the root hairs. The root cap protects the growing tip of roots from soil and hard rock surface. 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. A root-cap is usually absent in the roots of (a) Hydrophytes (b) Epiphytes (c) Parasites (d) All of the above. • Root cap is made up of a dead tissue called CALYPTROGEN. Root cap is absent in (a) Halophytes (b) Hydrophytes (c) Xerophytes (d) Homophytes [R.P.M.T. Morphological Adaptive feature: Root: Root system fibrous and adventitious with dense and adequate volume, which helps to maintain its balance with the aerial part. (c) Only in tap roots (d) In all the roots. Root cap contain more amount of golgi body which secrete mucilage which makes the root slimy. Root caps usually absent. § Root hairs arise from the epidermal cell hence it … 22. It is present just above the root cap. Note : Root cap is absent in Eichhornia . Learn vocabulary, terms, and more with flashcards, games, and other study tools. In hydrophytes, root cap is absent. Write your comments here: Name *: Email: Alert me © 2012-2020 by GeekMCQ™ Technologies. 3. (a) Periblem (b) Phellogen (c) Dermatogen (d) pleorome Q3. (iii) Region of Root Hairs: This region is present above the region of elongation. This may probably be the reason why roots in hydrophytes are reduced or absent. The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. I. Root cap is absent in [RPMT 2002; Manipal 2005] A) Halophytes done clear. a. Heterospory b. Ø Root hairs are ephemeral (= short lived) structures. 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. 08 www.gangwarinstitute.com Contact : 8400-582-582, 8604-582-582. The root caps of vascular hydrophytes are typically elongated and sheath-like (root pockets) or may also be totally absent (e.g., Azolla). The root caps are absent in parasites and mycorrhizal roots. 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? 5. D. Roots, stems, and leaves. a) Aerenchyma b) Collenchyma c) Stomata d) Root system Region of maturation : From this region some of the epidermal cells form very fine and delicate, 1. Hydrophytes are the plants that grow in watery places or the places which remain wet throughout the year. This is the meristematic region of the root which produces new cells by cell division. Plants found in places where excess of water is present are called hydrophytes. Ø In herbaceous plants, the epidermis … Root cell walls usually remain abnormally thin. 5. View Solution play_arrow; question_answer15) The root that never does primary function is ... A root cap is absent in the root of . As a result of which root cap is absent in hydrophytes. (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. B) Photosynthesis done clear. ii. Ans. Start studying Morphology of Flowering Plants. so maximum growth in root takes place behind the apex. Roots are generally fibrous type and adventitious, unbranched or sparsely branched. Dependent sporophyte c. Free-living gametophyte d. Haplontic life cycle 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 Generally root cap is single layered by in pandanus (screw pine) root cap is multilayered. D) Submerged hydrophytes done clear. Q60. Note : 1. Ø Root hairs absorb nutrients and water from the soil. Roots with well -developed root cap. 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 By definition, succulent 2. In hydrophytes root cap is absent eg. QUIESCENT CENTRE What are Hydrophytes? Root pockets are also the root caps present in hydrophytes. • In free floating hydrophytes root pockets are present. Write its adaptations. (iii) Epidermis usually lacks cuticle or peri­derm (suberised cork ceils) and stomata are gene­rally absent in the submerged organs. 75. MERISTEMATIC ZONE. B) Hydrophytes done clear. 2002] 6. Hence it is also called CALYPTRA. iii. In many plants, stomata are found only on thee lower surface of the leaf. The waxy surface of the floating leaves of the hydrophytes prevents [Orissa JEE 2005] A) Respiration done clear. Due to presence of root cap position of root apex is sub terminal. The stem is long, slender, weak, spongy and flexible type in submerged hydrophytes… (iv) If roots are present they are always of adventitious type e.g., Nymphaea, Nelumbo etc. Vascular tissue in flowering plants develops from. Generally root cap is single layered but in Pandanus (screw pine), root cap is multilayered. § It produces cluster of fine thread like structures known as root hairs. 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. 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. 2. Root hairs are absent. Root Hair Zone § It is present above elongation zone. (ii) Region of cell elongation : The region of cell division lies partly within and partly beyond the root cap. Secondary growth absent. Palisade parenchyma is absent in leaves of .. In hydrophytes (like Pistia, Lemna and Eichhornia) root pocket is present instead of root cap. In some plants like Lemna, roots perform the act of balancing the plant body. It is thin in Mesophytes and highly thick in xerophytes. Q1.The apical meristem of the root is present. It is absent in hydrophytes, epiphytes, parasites and mycorrhiza. Answer (d) The main function of root-cap is to protect the growing apex from soil particles. In some xerophytes, the stem consists of ridges. C) As hydrophytes are generally aquatic plants, no such protection is needed for their roots. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are evolved, and in submerged plants such as Vallisneria, Hydrilla, etc., Types of root system • Tap root system The central main axis is called tap root. Which one of the following is considered important in the development of seed habit? Ø Root hairs are absent in the exact tip portion of the root. ... totally absent in hydrophytes In: Nymphaea, special type of star shaped lignified cells (asterosclereids) present which will provide mechanical support. Adding salt and sugar to food substances helps in preserving them for a longer duration. Ø Root hairs increase the surface area for absorption. Example: hydrilla, lotus etc. Pistia. • It is also well developed in mesophytes and xerophytes, absent in hydrophytes. C) The root system in hydrophytes is feebly developed and root, root hairs and cap arq absent. In hydrophytes root cap is absent. Root hairs and root cap are absent. 12. 3. (1) Roots : (i) Root system is very much reduced in some floating plants (Wolffia, Utricularia) and in submerged plants (Ceratophyllum) the roots are absent. 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) Young root. The thick waxy layer covers the surface of aerial organs is called Cuticle. Q.34. It is made up of waxy substance called cutin. Q2. Root cap contain more amount of golgi body which secrete mucilage which make the root slimy. Root cap is absent in a) Mesophytes b) Hydrophytes c) Epiphytes d) Xerophytes 13. Root cap is absent in (1) Xerophytes (2) Hydrophytes (3) Mesophytes (4) Halophytes 76. Prop/pillar roots 19 Name the adventitious roots found in sugarcane and maize. (a) Only in the radical (b) Only in adventitious root. NSC Trainee Mate 2018 Agriculture Exams Study Material Agronomy Horticulture Plant Pathology Entomology Plant Breeding Genetics Current Affairs A group of inactive cells present between the dermatogen and calyptrogen is called quiescent centre. The leaves of the floating hydrophytes are broad while those of the submerged plants are dissected or ribbon shaped. [Karnataka 2003] 7. Hydrophytic Adaptations are: i. Root system is not well developed. Zone of atomosphere near the ground is (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Homosphere. 10 . It is absent in hydrophytes and underground organs. Plant growing in water (hydrophytes) or on another plant (epiphytes) or in another plant (parasites) are devoid of root-cap. 3. 2. In place of root cap, root pocket is pre sent which is fil led by air. 4. Root pocket present instead of root cap which protect roots from injury, holds the roots downward and act as water reservoir. Root cap is absent in a. Mesophytes b. Xerophytes c. Hydrophytes d. Halophytes 25. 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 Such plants develop the following morphological and anatomical adaptations. Watch Video Solution On Doubtnut App Q-13 - 13843459 The cells of … Roots caps may be absent or root pockets are present (eichornia). Hope this information will clear your doubts about the topic. In hydrophytes root cap is absent. B) Stilt root of Pandanus done clear. Atmosphere consists of The stem is soft, thin and flexible in hydrophytes. Leaf – The leaves of suspended and submerged hydrophytes are either diss ected [ Hydrilla and Ceratophyllum] or long, soft and ribbon like [Vallisnaria]. Root hairs are absent (lemna) or feebly developed. A) Hanging prop root of Banyan done clear. The root-system in hydrophytes is poorlyevolved and root hairs and root cap are absent. 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