2002] 6. Subgroup: Free Floating Hydrophytes . As a result of which root cap is absent in hydrophytes. In some floating plants such as Utricularia, Ceratophyllum, etc., no roots are evolved, and in submerged plants such as Vallisneria, Hydrilla, etc., 10 . Root cap contain more amount of golgi body which secrete mucilage which makes the root slimy. 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 In many plants, stomata are found only on thee lower surface of the leaf. 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 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 The root caps of vascular hydrophytes are typically elongated and sheath-like (root pockets) or may also be totally absent (e.g., Azolla). ii. It is thin in Mesophytes and highly thick in xerophytes. Fixed floating hydrophytes done clear. Dependent sporophyte c. Free-living gametophyte d. Haplontic life cycle Types of root system • Tap root system The central main axis is called tap root. Ø In herbaceous plants, the epidermis … I. 1. Note : Root cap is absent in Eichhornia . Ans. Start studying Morphology of Flowering Plants. Morphological Adaptive feature: Root: Root system fibrous and adventitious with dense and adequate volume, which helps to maintain its balance with the aerial part. 4. 2. 5. It is present just above the root cap. 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. B) Hydrophytes done clear. 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. (iv) The reduction of absorbing tissue The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. Root cap is absent in a) Mesophytes b) Hydrophytes c) Epiphytes d) Xerophytes 13. Adding salt and sugar to food substances helps in preserving them for a longer duration. The root-system in hydrophytes is poorlyevolved and root hairs and root cap are absent. 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? The stem is soft, thin and flexible in hydrophytes. 22. Root hairs and root cap are absent. Due to presence of root cap position of root apex is sub terminal. Generally root cap is single layered by in pandanus (screw pine) root cap is multilayered. In hydrophytes root cap is absent. (a) Only in the radical (b) Only in adventitious root. The root caps are absent in parasites and mycorrhizal roots. 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. 5. 3. The root system in hydrophytes is feebly developed and root, root hairs and cap arq absent. (iv) If roots are present they are always of adventitious type e.g., Nymphaea, Nelumbo etc. Root hairs are absent. Zone of atomosphere near the ground is (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Homosphere. MERISTEMATIC ZONE. Vascular tissue in flowering plants develops from. Q60. Ø Root hairs are absent in the exact tip portion of the root. • In free floating hydrophytes root pockets are present. 12. Root cap is absent in (1) Xerophytes (2) Hydrophytes (3) Mesophytes (4) Halophytes 76. The leaves of the floating hydrophytes are broad while those of the submerged plants are dissected or ribbon shaped. Ø Root hairs absorb nutrients and water from the soil. View Solution play_arrow; question_answer15) The root that never does primary function is ... A root cap is absent in the root of . QUIESCENT CENTRE B) Stilt root of Pandanus done clear. (1) Roots : (i) Root system is very much reduced in some floating plants (Wolffia, Utricularia) and in submerged plants (Ceratophyllum) the roots are absent. This is the meristematic region of the root which produces new cells by cell division. C) Hydrophytic Adaptations are: i. Root system is not well developed. Secondary growth absent. Write its adaptations. Root cell walls usually remain abnormally thin. The root cap protects the growing tip of roots from soil and hard rock surface. Roots caps may be absent or root pockets are present (eichornia). Root hairs are absent (lemna) or feebly developed. (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. The stem is long, slender, weak, spongy and flexible type in submerged hydrophytes… (iii) Region of Root Hairs: This region is present above the region of elongation. (c) Only in tap roots (d) In all the roots. Root cap is absent in Hydrophytes 16 Tuberous root (tap root) is found in Mirabilis jalapa 17 Buttress root are found in Peepal 18 Which type of adventitious roots are found in banyan? The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. 2. As hydrophytes are generally aquatic plants, no such protection is needed for their roots. Such plants develop the following morphological and anatomical adaptations. § Root hairs arise from the epidermal cell hence it … ... totally absent in hydrophytes In: Nymphaea, special type of star shaped lignified cells (asterosclereids) present which will provide mechanical support. Prop/pillar roots 19 Name the adventitious roots found in sugarcane and maize. Root cap is absent in a. Mesophytes b. Xerophytes c. Hydrophytes d. Halophytes 25. Leaf – The leaves of suspended and submerged hydrophytes are either diss ected [ Hydrilla and Ceratophyllum] or long, soft and ribbon like [Vallisnaria]. Roots are generally fibrous type and adventitious, unbranched or sparsely branched. 3. The root pockets replace the root hairs. D) Submerged hydrophytes done clear. It is made up of waxy substance called cutin. It is absent in hydrophytes and underground organs. (ii) Region of cell elongation : The region of cell division lies partly within and partly beyond the root cap. Root Hair Zone § It is present above elongation zone. (iii) Epidermis usually lacks cuticle or peri­derm (suberised cork ceils) and stomata are gene­rally absent in the submerged organs. This may probably be the reason why roots in hydrophytes are reduced or absent. Root cap is absent in (a) Halophytes (b) Hydrophytes (c) Xerophytes (d) Homophytes [R.P.M.T. The thick waxy layer covers the surface of aerial organs is called Cuticle. Answer (d) The main function of root-cap is to protect the growing apex from soil particles. • Root cap is made up of a dead tissue called CALYPTROGEN. § It produces cluster of fine thread like structures known as root hairs. [Karnataka 2003] 7. Q2. C) Xerophytes done clear. Ø Root hairs are ephemeral (= short lived) structures. Region of maturation : From this region some of the epidermal cells form very fine and delicate, Ø Root hairs increase the surface area for absorption. B) Young root. Root pockets are also the root caps present in hydrophytes. B) Photosynthesis done clear. Write your comments here: Name *: Email: Alert me © 2012-2020 by GeekMCQ™ Technologies. a. Heterospory b. C) By definition, succulent Plant growing in water (hydrophytes) or on another plant (epiphytes) or in another plant (parasites) are devoid of root-cap. In some xerophytes, the stem consists of ridges. A root-cap is usually absent in the roots of (a) Hydrophytes (b) Epiphytes (c) Parasites (d) All of the above. 08 www.gangwarinstitute.com Contact : 8400-582-582, 8604-582-582. Q1.The apical meristem of the root is present. iii. In hydrophytes root cap is absent eg. Pistia. • It is also well developed in mesophytes and xerophytes, absent in hydrophytes. In some plants like Lemna, roots perform the act of balancing the plant body. 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 … Which one of the following is considered important in the development of seed habit? What are Hydrophytes? Palisade parenchyma is absent in leaves of .. 2. Note : 1. Root pocket present instead of root cap which protect roots from injury, holds the roots downward and act as water reservoir. Atmosphere consists of In hydrophytes, root cap is absent. A) Hanging prop root of Banyan done clear. 3. In place of root cap, root pocket is pre sent which is fil led by air. Root cap contain more amount of golgi body which secrete mucilage which make the root slimy. A group of inactive cells present between the dermatogen and calyptrogen is called quiescent centre. Root caps usually absent. Hence it is also called CALYPTRA. Generally, root cap is single layered but in pandanus (screw pine) root cap is multilayered. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Example: hydrilla, lotus etc. Q.34. (a) Periblem (b) Phellogen (c) Dermatogen (d) pleorome Q3. Roots with well -developed root cap. It is absent in hydrophytes, epiphytes, parasites and mycorrhiza. The waxy surface of the floating leaves of the hydrophytes prevents [Orissa JEE 2005] A) Respiration done clear. Generally root cap is single layered but in Pandanus (screw pine), root cap is multilayered. 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 Hope this information will clear your doubts about the topic. D. Roots, stems, and leaves. Root cap is absent in [RPMT 2002; Manipal 2005] A) Halophytes done clear. Plants found in places where excess of water is present are called hydrophytes. 75. Watch Video Solution On Doubtnut App Q-13 - 13843459 The cells of … a) Aerenchyma b) Collenchyma c) Stomata d) Root system Leaves in hydrophytes are thin and ribbon like. NSC Trainee Mate 2018 Agriculture Exams Study Material Agronomy Horticulture Plant Pathology Entomology Plant Breeding Genetics Current Affairs Hydrophytes are the plants that grow in watery places or the places which remain wet throughout the year. In hydrophytes (like Pistia, Lemna and Eichhornia) root pocket is present instead of root cap. In hydrophytes root cap is absent. so maximum growth in root takes place behind the apex. Watch Video Solution On Doubtnut App Q-13 - 13843459 the cells of … 12 which secrete which! Helps in preserving them for a longer duration be absent or root pockets are present they always. Parasites and mycorrhizal roots If roots are present ground is ( a ) Hanging prop root.. 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