#biology

#howwatersupportplant

lesson 1.3 ,p:no 10

Water for support

·         Water help the plant to stand upright without wilting.

·         Plant cells contain lot of water especially in vacuole.

·         The cells get expanded and press out each other to make the plant firm.

·         Lack of water make the plant soft and weak.

·         This leads to wilting.

                                                                     Water for transport

·         Water is transported from roots to the leaves through tubes called xylem.

·         Mineral salts are also transported through water.

·         Xylem and Phloem

·         Xylem are tube like thing in the plant.

·         It transports water and minerals to the leaf.

·         The leaves make food with the help of water.

·         The xylem cell is like

·         phloem takes the food from the leaf and transport it to all parts.

·         The cells of phloem look like

·         Xylem can only transport substance on one direction.

·         Phloem can transport substance to both directions.

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                                                                                Water for cooling

·         The water from xylem spreads out in the leaf.

·         When this water evaporates and stay in the air gap in the leaf.

·         The plants will be cooled

                                                                             Water for photosynthesis

·         Water is essential for photosynthesis.

·         Water combines with carbon dioxide inside the chloroplast.

·         photosynthesis result in glucose and oxygen.

                                                           Questions

·         What is the difference between xylem and phloem?

·         Explain photosynthesis.

·         Why do plants wilt.

·         Name the different type of cells in plants.

·         How does water go through xylem against gravity?