Plant Systems


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Plant Systems

  1. 1. Plant Systems By Cheryl Lee
  2. 2. Plants and their parts <ul><li>A plant is a system. </li></ul><ul><li>Roots, stem, leaves, flowers and fruits are the main parts of a plant. </li></ul><ul><li>These parts differentiate plants from animals. </li></ul><ul><li>Each plant part has its own functions. </li></ul>
  3. 3. Part of the plant Functions Roots <ul><li>Anchor the plant in the ground </li></ul><ul><li>Absorb mineral salts needed for growth </li></ul>Stem <ul><li>Supports the leaves to allow them to receive maximum sunlight </li></ul><ul><li>Transports water and mineral salts absorbed by roots to the leaves </li></ul><ul><li>Transports food/sugar from the leaves to the other parts of the plant </li></ul>Flower <ul><li>Responsible for sexual reproduction </li></ul><ul><li>Colour and fragrance helps to attract pollinators like insects and birds </li></ul>Fruit <ul><li>Contains and protects the seeds </li></ul><ul><li>Plays an important role in the dispersal of seeds </li></ul>Leaf <ul><li>Absorb sunlight for photosynthesis to take place </li></ul><ul><li>Carry out photosynthesis to make food </li></ul>Some roots also store food. These roots are known as storage roots. Carrots, turnips and sweet potatoes are examples of plants that have storage roots.
  4. 4. <ul><li>5. If one part of the plant is missing, it will not be able to function properly as a system. </li></ul><ul><li>6. Plants without leaves will not be able to carry out photosynthesis. </li></ul><ul><li>7. Flowering plants without flowers will generally not be able to reproduce itself. </li></ul><ul><li>8. Plants without fruits will not be able to be grown from seeds. </li></ul><ul><li>Without its stem, a plant would not have any support or be able to transport water, mineral salts and food to the rest of the plant parts. </li></ul><ul><li>Without roots, the plant will also be unable to take in water and mineral salts from the ground. </li></ul>Xylem cells are cells that transport water in the stem. Phloem cells are cells in the stem that transport food or sugar produced by the leaves.
  5. 5. Leaf <ul><li>The leaf is also known as a sugar-making factory. </li></ul><ul><li>The food that a plant needs is made in the leaves. </li></ul><ul><li>A leaf has a leaf stalk, leaf blade and veins. </li></ul>Leaf stalk Leaf base Main vein Branch veins Leaf blade Apex
  6. 6. <ul><li>The leaf appears green due to the presence of chlorophyll. </li></ul><ul><li>Chlorophyll traps energy from light. </li></ul><ul><li>A red or orange colored leaf is able to carry out photosynthesis if there is hidden chlorophyll lying below the coloured pigments. </li></ul><ul><li>Plants need water, carbon dioxide, sunlight and chlorophyll in order to carry out photosynthesis . </li></ul>Carbon dioxide + water Light energy Chlorophyll Sugar + Oxygen
  7. 7. <ul><li>Sugar and oxygen are the products of photosynthesis. </li></ul><ul><li>Light energy that is needed for photosynthesis to take place can come from the Sun or an artificial source of light like a table lamp. </li></ul><ul><li>The leaves get water from the roots with the help of xylem tubes in the stems and veins in the leaf blades. </li></ul><ul><li>Openings found in the leaf allow the exchange of oxygen and carbon dioxide with the surroundings. </li></ul><ul><li>These openings found in the leaf are known as stomata. </li></ul>Photosynthesis allows plants to have a constant supply of food. Through photosynthesis, plants can also provide food and oxygen to other living things.
  8. 8. Respiration <ul><li>Like all living things, plants also breathe in oxygen and breathe out carbon dioxide all the time. </li></ul><ul><li>Plants use oxygen to change food that they have made into energy for growth. </li></ul><ul><li>This is the process of respiration. </li></ul>Glucose + Oxygen Respiration Energy + Carbon dioxide + Water
  9. 9. <ul><li>Unlike photosynthesis, respiration takes place at all times at all independent of chlorophyll and light. </li></ul><ul><li>In the process of respiration, oxygen is used and carbon dioxide and water are given off. </li></ul>Do you know why the air in the park is fresher in the day? It is because plants are able to carry out photosynthesis so carbon dioxide is removed from the air and oxygen is released into the air.
  10. 10. Thank you