Revision Exercise Form 4 Biology

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Tick (v) if it is a true statement.
Chapter 2 Cell Structure and Cell Organisation
1. The cell is the basic unit of life for all organisms.
2. All cells have the same shape and size.
3. All cells have a plasma membrane, nucleus and cytoplasm.
4. Protoplasm consists of a plasma membrane and nucleus.
5. The nucleus consists of chromosomes and a nucleolus.
6. Organelles that are found in the cytoplasm of a cell include the nucleus, vacuole, endoplasmic reticulum, mitochondria and Golgi apparatus. 7. The vacuole of a plant cell is enclosed by the tonoplast. 8. Human cheek cells and epidermal cells of onions do not have chloroplasts. 9. Epidermal cells of onions have big vacuoles.

10. Cells wall and plasma membranes are fully permeable.
11. Amoeba sp. Uses pseudopodia for movement and to trap food. 12. Cell specialisation allows cells to form tissues.
13. Tissues are organised into functional units called organs. 14. Epithelial tissue holds body structures together, providing protection and support. 15. The stomach, small intestines, liver and pancreas work together to form the digestive system which is required for the intake, digestion and absorption of food. 16. All the various organ systems coordinate their activities together to form a unicellular organism. 17. Multicellular organisms regulate their internal environment so that the cells will always experience conditions which permit efficient functioning. 18. Various tissues are involved in maintaining optimal internal environment. 19. Factor affecting the internal environment include temperature, pH level, light intensity and glucose level. 20. Regulation of the glucose level in the blood involves the liver, pancreas and circulatory system. 21. Each cell is adapted for different function.

22. Every component in the cell carries out a specific function and is vital for the survival of the cell. 23. If a cell does not have a Golgi apparatus, then it will not be able to transport the protein synthesised by ribosome. 24. Root hair cells are long and narrow to increase the surface area for absorption of water and mineral salts. 25. Xylem vessels have lignin on their walls to transport water and mineral salts. 26. Red blood cells contain haemoglobin to transport oxygen to the cells in the body. Chapter 3 Movement of Substances Across the Plasma Membrane 1. Passive transport across the plasma membrane ensures the cell get its supply of oxygen, glucose and amino acids. 2. Substances that are required by cells and those to be eliminated from cells can move across the plasma membrane. 3. The plasma membrane is semi-permeable.

4. The fluid mosaic model is made up of a phospholipid bilayer with amino acids scattered in it. 5. The phospholipid bilayer and protein molecules in the plasma membrane are static. 6. Passive transport is simple diffusion and facilitated diffusion across a membrane. 7. Passive transport occurs down the concentration gradient. 8. Specific proteins facilitate diffusion across the plasma membrane. 9. Digested food diffuses from the ileum into the capillaries in the vilus by simple diffusion. 10. Active transport is the pumping of minerals salts into the root hairs down the concentration gradient. 11. A hypotonic solution is more diluted than the concentration of the cells that are placed in the solution. 12. The direction of the movement of water molecules across the plasma membrane depends on the concentration gradient. 13. Water molecules in the hypertonic solution diffuse across the membrane against the concentration gradient. 14. Plants cells undergo plasmolysis in a hypertonic solution. 15. In a hypotonic solution, plants cells undergo haemolysis. 16. A plasmolysed cell cannot become turgid again when placed in distilled water. 17. The concentration of cell sap in plant cells is the concentration that is isotonic with the solution around it. 18. Plants with excess fertiliser with not wilt.

19. Plant cells that undergo plasmolysis become...
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