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