... totally absent in hydrophytes In: Nymphaea, special type of star shaped lignified cells (asterosclereids) present which will provide mechanical support. Generally root cap is single layered but in Pandanus (screw pine), root cap is multilayered. Note : Root cap is absent in Eichhornia . ⢠Root cap is made up of a dead tissue called CALYPTROGEN. It is present just above the root cap. B) Stilt root of Pandanus done clear. so maximum growth in root takes place behind the apex. It is made up of waxy substance called cutin. In some plants like Lemna, roots perform the act of balancing the plant body. 22. Root hairs are absent. 10 . C) Xerophytes done clear. (c) Only in tap roots (d) In all the roots. A root-cap is usually absent in the roots of (a) Hydrophytes (b) Epiphytes (c) Parasites (d) All of the above. The root-system in hydrophytes is feebly evolved and root hairs and root cap are absent. 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. D) Submerged hydrophytes done clear. (iv) If roots are present they are always of adventitious type e.g., Nymphaea, Nelumbo etc. Prop/pillar roots 19 Name the adventitious roots found in sugarcane and maize. B) Hydrophytes done clear. What are Hydrophytes? 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. (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. Root cap is absent in a. Mesophytes b. Xerophytes c. Hydrophytes d. Halophytes 25. ⢠It is also well developed in mesophytes and xerophytes, absent in hydrophytes. Root cell walls usually remain abnormally thin. Adding salt and sugar to food substances helps in preserving them for a longer duration. The thick waxy layer covers the surface of aerial organs is called Cuticle. In some xerophytes, the stem consists of ridges. C) Vascular tissue in flowering plants develops from. 4. Root cap is absent in (a) Halophytes (b) Hydrophytes (c) Xerophytes (d) Homophytes [R.P.M.T. a. Heterospory b. 1. Fixed floating hydrophytes done clear. I. Q1.The apical meristem of the root is present. Write your comments here: Name *: Email: Alert me © 2012-2020 by GeekMCQ⢠Technologies. A group of inactive cells present between the dermatogen and calyptrogen is called quiescent centre. Leaf â The leaves of suspended and submerged hydrophytes are either diss ected [ Hydrilla and Ceratophyllum] or long, soft and ribbon like [Vallisnaria]. 2002] 6. Palisade parenchyma is absent in leaves of .. (1) Roots : (i) Root system is very much reduced in some floating plants (Wolffia, Utricularia) and in submerged plants (Ceratophyllum) the roots are absent. 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 stem is long, slender, weak, spongy and flexible type in submerged hydrophytes⦠It is thin in Mesophytes and highly thick in xerophytes. Leaves in hydrophytes are thin and ribbon like. In hydrophytes root cap is absent. Which one of the following is considered important in the development of seed habit? Root pockets are also the root caps present in hydrophytes. 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 root pockets replace the root hairs. Roots caps may be absent or root pockets are present (eichornia). 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? Root cap is absent in a) Mesophytes b) Hydrophytes c) Epiphytes d) Xerophytes 13. Zone of atomosphere near the ground is (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Homosphere. Plants found in places where excess of water is present are called hydrophytes. § Root hairs arise from the epidermal cell hence it ⦠2. Start studying Morphology of Flowering Plants. Q2. Generally, root cap is single layered but in pandanus (screw pine) root cap is multilayered. ii. 75. It is absent in hydrophytes, epiphytes, parasites and mycorrhiza. Atmosphere consists of Ø Root hairs are ephemeral (= short lived) structures. Ans. In hydrophytes (like Pistia, Lemna and Eichhornia) root pocket is present instead of root cap. B) Photosynthesis done clear. 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 The stem is soft, thin and flexible in hydrophytes. [Karnataka 2003] 7. Secondary growth absent. 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. Hydrophytic Adaptations are: i. Root system is not well developed. Root pocket present instead of root cap which protect roots from injury, holds the roots downward and act as water reservoir. Watch Video Solution On Doubtnut App Q-13 - 13843459 The cells of ⦠Types of root system ⢠Tap root system The central main axis is called tap root. 3. 08 www.gangwarinstitute.com Contact : 8400-582-582, 8604-582-582. Ø Root hairs increase the surface area for absorption. The root-system in hydrophytes is poorlyevolved and root hairs and root cap are absent. In hydrophytes root cap is absent. Region of maturation : From this region some of the epidermal cells form very fine and delicate, A) Hanging prop root of Banyan done clear. Ø Root hairs absorb nutrients and water from the soil. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ⢠In free floating hydrophytes root pockets are present. Subgroup: Free Floating 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. QUIESCENT CENTRE As a result of which root cap is absent in hydrophytes. In many plants, stomata are found only on thee lower surface of the leaf. C) 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 ⦠Due to presence of root cap position of root apex is sub terminal. 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. Hence it is also called CALYPTRA. Root cap is absent in [RPMT 2002; Manipal 2005] A) Halophytes done clear. This may probably be the reason why roots in hydrophytes are reduced or absent. 3. 3. This is the meristematic region of the root which produces new cells by cell division. Note : 1. Generally root cap is single layered by in pandanus (screw pine) root cap is multilayered. (iii) Epidermis usually lacks cuticle or periderm (suberised cork ceils) and stomata are generally absent in the submerged organs. Ø Root hairs are absent in the exact tip portion of the root. The waxy surface of the floating leaves of the hydrophytes prevents [Orissa JEE 2005] A) Respiration done clear. In place of root cap, root pocket is pre sent which is fil led by air. (iii) Region of Root Hairs: This region is present above the region of elongation. Write its adaptations. Root cap is absent in (1) Xerophytes (2) Hydrophytes (3) Mesophytes (4) Halophytes 76. 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 MERISTEMATIC ZONE. By definition, succulent Dependent sporophyte c. Free-living gametophyte d. Haplontic life cycle Answer (d) The main function of root-cap is to protect the growing apex from soil particles. In hydrophytes root cap is absent eg. The leaves of the floating hydrophytes are broad while those of the submerged plants are dissected or ribbon shaped. View Solution play_arrow; question_answer15) The root that never does primary function is ... A root cap is absent in the root of . By cell division lies partly within and partly beyond the root of Banyan done clear which root cap contain amount. 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