{"id":135109,"date":"2022-04-07T12:00:21","date_gmt":"2022-04-07T06:30:21","guid":{"rendered":"https:\/\/www.aakash.ac.in\/blog\/?p=135109"},"modified":"2023-05-02T13:05:50","modified_gmt":"2023-05-02T07:35:50","slug":"transport-in-plants-highlights-from-ncert-biology-for-neet","status":"publish","type":"post","link":"https:\/\/www.aakash.ac.in\/blog\/transport-in-plants-highlights-from-ncert-biology-for-neet\/","title":{"rendered":"Transport in Plants: Highlights from NCERT Biology for NEET 2022"},"content":{"rendered":"<p>=<a href=\"https:\/\/dlp.aakash.ac.in\/medical\/one-year-all-india-aakash-test-series-aiats-neet-2023-class-xii-passed?utm_source=seobanner&amp;utm_medium=DLP_Aakashweb&amp;utm_campaign=AIATS_blogcontent\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium aligncenter\" src=\"https:\/\/d20x1nptavktw0.cloudfront.net\/wordpress_media\/2023\/02\/750x242-v2.jpg\" width=\"750\" height=\"242\" \/><\/a><span style=\"font-weight: 400;\">A quick revision via highlights from NCERT Biology boosts your NEET preparation. Students can find below highlights of Transport in Plants as per the <\/span><a href=\"https:\/\/www.aakash.ac.in\/neet-biology-syllabus\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET 2022 Syllabus<\/span><\/a><span style=\"font-weight: 400;\">. Transport in Plants is amongst the NEET 2022 important chapters. Aspirants of NEET can utilise the highlights given below for last-minute revisions. Highlights from NCERT Biology\u2013 Transport in Plants include all the vital <\/span><a href=\"https:\/\/www.aakash.ac.in\/important-concepts\/biology\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">biology concepts<\/span><\/a><span style=\"font-weight: 400;\"> frequently asked in the NEET exam. Go through the important terms, definitions, functions, and much more in an easy-to-comprehend manner to enable every aspirant to outperform in the NEET 2022 exam and an outshining NEET 2022 Result.<\/span><br \/>\n<a href=\"https:\/\/dlp.aakash.ac.in\/medical\/neet-booster-test-series-2023?utm_source=seobanner&amp;utm_medium=DLP_aakashweb&amp;utm_campaign=Neet_Booster_blogcontent\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/d20x1nptavktw0.cloudfront.net\/wordpress_media\/2023\/02\/750x242.jpg\" width=\"750\" height=\"242\" \/><\/a><\/p>\n<h2>Means of Transport<\/h2>\n<p><span style=\"font-weight: 400;\">There are various means of transport for water and nutrients in plants depending upon the type of movement taken into consideration.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Small distance transport:\u00a0<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Diffusion<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cytoplasmic streaming<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Active transport<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Translocation or transport over long distances:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Through vascular transport via xylem and phloem<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The transportation of nutrients and water in plants has a set direction. It can be<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Unidirectional: In rooted plants, the transport of water and minerals from roots to the stems via xylem is unidirectional.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Bidirectional: Organic and mineral nutrients have multidirectional transport.<\/span><\/li>\n<\/ol>\n<h3>Important Terms<\/h3>\n<ul>\n<li aria-level=\"1\"><b>Simple Diffusion<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Definition: The random movement of substances from their higher concentration region to their lower concentration region.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The movement of substances takes place along the concentration gradient, and thus it does not require any energy expenditure. It is a passive means of transport.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Simple diffusion depends on the following aspects:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Concentration gradient<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Size of molecules<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Temperature<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Pressure<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Surface area available for diffusion<\/span><\/li>\n<\/ul>\n<ul>\n<li aria-level=\"1\"><b>Facilitated Diffusion<\/b><\/li>\n<\/ul>\n<p><b>Definition:<\/b><span style=\"font-weight: 400;\"> The movement of hydrophilic molecules with the support of transmembrane proteins is called facilitated diffusion.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Facilitated diffusion favours the movement of large particles as well. However, the process is sensitive to inhibitor molecules.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The movement of substances takes place along the concentration gradient, and thus it does not require any energy expenditure. It is a passive means of transport.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Active Transport\/ Uphill Transport<\/b><\/li>\n<\/ul>\n<p><b>Definition:<\/b><span style=\"font-weight: 400;\"> The movement of molecules of substances from a lower concentration region to a higher concentration region against the concentration gradient, requiring energy expenditure, is called active transport.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Porins\u00a0<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Porins are membrane proteins forming large pores in the outer membranes of certain organelles such as plastids and mitochondria as well as some bacteria, allowing molecules of small size to pass through.\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Aquaporins<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">They are membrane proteins that serve as channels for water transfer and sometimes small solutes across membranes.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Symport<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It is the transport process of two different molecules in the same direction as a carrier molecule.\u00a0\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Antiport<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">It is the transport process of two different molecules in the opposite direction through a membrane.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Uniport<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The movement of molecules of a substance across a membrane independent of other molecules is called uniport.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Comparison of Different Transport Systems<\/span><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>Characteristics<\/b><\/td>\n<td><b>Simple Diffusion<\/b><\/td>\n<td><b>Facilitated Diffusion<\/b><\/td>\n<td><b>Active Transport<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Needs special membrane proteins<\/span><\/td>\n<td><b>No<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Uphill transport<\/span><\/td>\n<td><b>No<\/b><\/td>\n<td><b>No<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Transport saturates<\/span><\/td>\n<td><b>No<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Highly selective<\/span><\/td>\n<td><b>No<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<\/tr>\n<tr>\n<td><span style=\"font-weight: 400;\">Requires ATP energy<\/span><\/td>\n<td><b>No<\/b><\/td>\n<td><b>No<\/b><\/td>\n<td><b>Yes<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Plant Water Relations<\/h2>\n<p><span style=\"font-weight: 400;\">Here are some important concepts from NCERT Biology for NEET 2022 on Transport in Plants.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Water Potential (\u0471w)<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The difference between the energy of water in a system and the free energy of water molecules in pure water is referred to as water potential (\u0471w).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The water potential of pure water at standard temperature is zero.\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Solute Potential (\u03a8s)<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Solute potential or osmotic potential is the magnitude of lowering the water potential of a solution from pure water due to the dissolution of solute. So, more solute molecules mean lower solute potential.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Pressure Potential<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The pressure potential is the positive pressure developed in a system due to the osmotic entry of water into it.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relationship between water, solute, and pressure potential:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u03a8w = \u03a8p + \u03a8p\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Osmosis<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The movement of water molecules from their higher concentration to their lower concentration region via a semipermeable membrane is called osmosis.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Endosmosis<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The movement of water molecules inside a cell when placed in a hypotonic solution or water is called endosmosis. The cell becomes turgid.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Exosmosis<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When placed in a hypertonic solution, the movement of water molecules from inside a cell to the outside solution is called exosmosis. The cell becomes flaccid.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Hypotonic Solution and Hypertonic Solution<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The solution with lower solute concentration and lower osmotic pressure is hypotonic.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A solution with higher solute concentration and higher osmotic pressure is called hypertonic.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Osmotic Pressure<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The minimum pressure required to be applied to a solution for preventing the inward flow of water or its pure solvent via a semipermeable membrane is called osmotic pressure.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Turgor Pressure<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The cell fluid exerts turgor pressure on the cell membrane, which keeps that cell membrane pushed towards the cell wall. It is also called hydrostatic pressure.\u00a0\u00a0\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Plasmolysis<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">When a cell is placed in a hypertonic solution, water moves out of the cell. The cell membrane and protoplasm shrink away from its cell wall, and the phenomenon is called plasmolysis.\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Flaccid<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A cell is flaccid when water flows in and out of the cell in equilibrium. The plasma membrane of a flaccid cell is not pressed tightly against the cell wall. A cell becomes flaccid when it is placed in an isotonic solution.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Turgid<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A cell is turgid when placed in water or hypotonic solution, and water molecules enter the cell via endosmosis, making it distended. The cell membrane pressed tightly against the cell wall. A turgid cell has turgor pressure.\u00a0<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Imbibition<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The phenomenon of adsorption of any liquid or water by cells of a solid substance is called imbibition. No solution is formed in the process without creating a solution.<\/span><\/p>\n<h2>Long Distance Transport of Water<\/h2>\n<p><b>Mass flow or bulk flow system<\/b><span style=\"font-weight: 400;\"> is the movement of substances in mass or bulk from the sites of adsorption or production to the areas of consumption or storage due to pressure differences between the two regions.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Bulk flow takes place through a positive hydrostatic pressure gradient or negative hydrostatic pressure gradient.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Pathway of Water Flow<\/span><b>\u00a0<\/b><\/h3>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Apoplast pathway:<\/b><span style=\"font-weight: 400;\"> The movement of water from the root hair to the xylem via walls of intervening cells and not by crossing any membrane or cytoplasm describes the apoplast pathway. The movement takes place through bulk or mass flow.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Symplast pathway:<\/b><span style=\"font-weight: 400;\"> When water enters the cell sap of root hair, it moves into the underlying cortex cells via plasmodesmata. This water moves through the endodermis by the symplast ( inner side of plasma membrane), and thus the pathway is termed the symplast pathway. The presence of Casparian strips ensures a blockage of the movement of water and minerals from one side to the other via the cell wall route.<\/span><\/li>\n<\/ol>\n<h3>Important Terms<\/h3>\n<ul>\n<li aria-level=\"1\"><b>Root Pressure<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The root cells&#8217; hydrostatic pressure developed due to the endosmosis of water and minerals that help in the ascent of sap is called root pressure.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Guttation<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Guttation is the oozing out of a cell&#8217;s water from hydathodes due to positive xylem pressure.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Ascent of Sap<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The movement of absorbed water and dissolved substances upward in the form of a solution\/ sap from the plant\u2019s roots to the aerial parts is called the ascent of sap.<\/span><\/p>\n<h2>Transpiration<span style=\"font-weight: 400;\">\u00a0<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The loss of water via stomata from aerial parts of the plant is called transpiration. It depends on<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Temperature<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Light<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Humidity<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Wind speed<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Number and distribution of stomata<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Per cent of open stomata<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Water status of the plant<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Canopy structure.<\/span><\/li>\n<\/ul>\n<p><b>Transpirational pull<\/b><span style=\"font-weight: 400;\">: The water loss via transpiration creates a water deficit in the mesophyll cells. They absorb water from the adjacent cell creating a pull (cohesion-tension transpiration pull) for water along the channel. The upward pull is called transpirational pull.<\/span><\/p>\n<h2>Uptake and Transport of Mineral Nutrients<\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Some minerals move in from the soil to the epidermal cell cytoplasm with the help of specific proteins in the root hair cell membranes.\u00a0\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Endodermal cells have transport proteins that control the quantity and the types of solutes that will enter the xylem.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The lateral pathway of absorbed mineral ions from the epiblema to the xylem is as follows:<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">epiblema \u2192cortex \u2192endodermis \u2192pericycle \u2192 xylem<\/span><\/p>\n<h2>Phloem Transport<\/h2>\n<p><b>Flow from Source to Sink<\/b><\/p>\n<p><span style=\"font-weight: 400;\">The source-sink relationship describes the food production site as the source and where it is stored \/needed as a sink.<\/span><\/p>\n<p><b>The Pressure Flow or Mass Flow Hypothesis<\/b><\/p>\n<p><span style=\"font-weight: 400;\">It is the mechanism of translocation of sugars from source to sink. It is bidirectional, and we can summarise it as follows:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The leaves produce glucose by photosynthesis. It is converted to sucrose.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sucrose \u2192 companion cells \u2192 into the living phloem sieve tube cells via active transport<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">The loading of the source produces a hypertonic condition in the phloem, and water from the adjacent xylem vessels moves into the phloem by osmosis.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Osmotic pressure develops in the phloem, and the sap moves to lower pressure areas.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">When it reaches the sink, the osmotic pressure is reduced by active transport of the sucrose out of the phloem sap to the cells that require sugar energy.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Bottomline<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Plant Physiology has a weightage of 13% for the NEET 2022 exam. Transport in Plants covers a major section of this unit. Therefore, students must ensure that they are well-versed in every chapter topic. All students must check out the <\/span><a href=\"https:\/\/www.aakash.ac.in\/neet-exam-pattern\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET 2022 Exam Pattern<\/span><\/a><span style=\"font-weight: 400;\"> and understand how the questions are formulated. Moreover, we encourage NEET 2022 aspirants to take a few <\/span><a href=\"https:\/\/www.aakash.ac.in\/neet-mock-tests\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET Mock Tests 2022<\/span><\/a><span style=\"font-weight: 400;\"> to boost their preparation. Solving <\/span><a href=\"https:\/\/aakashdigital.com\/exams\/neet-previous-year-question-paper-and-solutions\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">NEET Previous Year Question Papers<\/span><\/a><span style=\"font-weight: 400;\"> is also helpful to ace your understanding and self-evaluation of the crucial biology concepts for NEET 2022.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>=A quick revision via highlights from NCERT Biology boosts your NEET preparation. Students can find below highlights of Transport in Plants as per the NEET 2022 Syllabus. Transport in Plants is amongst the NEET 2022 important chapters. Aspirants of NEET can utilise the highlights given below for last-minute revisions. Highlights from NCERT Biology\u2013 Transport in [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":135118,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3716],"tags":[875,2786,1776,2020,1464],"class_list":["post-135109","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-neet","tag-aakash-medical","tag-cbse-biology","tag-ncert-solutions","tag-neet-2022","tag-neet-biology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Transport in Plants: Highlights from NCERT Biology for NEET 2022<\/title>\n<meta name=\"description\" content=\"Transport in Plants: Highlights from NCERT Biology for NEET 2022: Go through the important terms and much more in an easy-to-comprehend manner to enable every aspirant to outperform in the NEET 2022 exam and an outshining NEET 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