all and write its
065. Name the rigid outer covering found in plant
Q66. What is a cell wall? Is it present in animal
Q67. Name the component of plant cell wall and we
function
Q68. What is cellulose?
069. Why is cell wall essential for plants?
Q70. What is plasmolysis? What happens when an
cell is placed in a hypertonic solution?
Q71. Rohan examined the temporary mount of Rhoeo la
cells under a high power microscope and observer
small green granules in these cells. What are
these granules? What do they contain? Why are
these essential?
Q72. What will happen when we keep a boiled leaf in a
sugar solution?
OR
Do the dead cells able to absorb water by
osmosis?
OR
What is the effect of boiling on plant leaf cells?
Does boiling affect the process of osmosis?
Q73. The plant cells do not burst when kept in a
hypotonic solution. Why?
Q74. Write any two functions of cell wall.
Q75. What happens when a Rhoeo leaf cell is kept in
water?
Answers
Explanation:
1) cell wall
2)No, cell wall is absent in animal cells. Cell walls are found in the cells of plants, fungi and bacteria which differ in their composition. The cell wall of plant cell is made up of cellulose while the cell wall of fungi is made up of chitin. The bacterial cell wall is made up of peptidoglycan.
3)It is located outside the cell membrane. It's main function is to provide cells rigidity, strength and protection and also acting as a filtering mechanism. 3. Composition of Plant Cell Wall • In the primary plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin
4)a natural substance that forms the cell walls of all plants and trees and is used in making plastics, paper, etc.
5) cell wall is essential for plants because it protects the plants from harsh conditions and humidity
6)
Plant cells are enclosed by a rigid cell wall. When the plant cell is placed in a hypotonic solution , it takes up water by osmosis and starts to swell, but the cell wall prevents it from bursting. ... The pressure inside the cell rises until this internal pressure is equal to the pressure outside.(its ans of question no 73 )
7)
The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants. The three layers are the middle lamella, primary cell wall, and secondary cell wall.(its answer of question no 74)
8)
Rheo leaf in plain water: ... This is due to the process of osmosis where water molecules moved into the cells of the rheo leaf. This happens because the plain water is hypotonic to the cell cytoplasm and hence, due to osmosis water molecules will move to this high concentration.( its answer of question no 75 )
(sorry to say but i don't know the answers of questions 71 and 72 )
Explanation:
Q65. It is the cell wall.
Q66. It's main function is protection. No its absent in animal cells
Q67. Cellulose
Q68. An insoluble substance which is the main constituent of plant cell walls and of vegitable fibers suck as cotton.
Q69. As plants cannot move, they need some protection from the harsh climate.
Q70. When plant cell is placed in hypertonic solution, it looses water and shrinks. It shrinks away from the cell wall. This process is known as plasmolysis. When plant cell is placed in a hypertonic solution, it shrinks.
Q71. These are the chloropalsts. They give the green colour to leaves as they contain a pigment called cholophyll which is issential for the process of photosynthesis.
Q72. No the dead cells do not absord water.
Q73. Because the cell wall does not let the cell rupture.
Q74. Main function is protection. Composed of cellulose.
Q75. The leaf will undergo osmosis. Since normal water is an example of hypotonic solution, the leaf will absorb water.