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