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Question 1:Halophytes are plants that live in swamps. Explain two adaptive features of these plants to increase the rate of photosynthesis. Answer:Two adaptive features of halophytes to increase the rate of photosynthesis:• Halophytes have leaves with thick cuticle to ensure sufficient water content• The root system that branches widely ensures that hydrophytes remain upright in … Read more

Question 3:Photograph 1 shows the aftermath of the nuclear plant explosion in Chernobyl, Russia, in 1986.(a) One of the methods used to treat the soil after the explosion is by removing pollutants through plants. What is the method called?(b) Suggest one type of plant that can be used for the method mentioned in 3(a).(c) Mr. … Read more

Lipids are complex organic compounds that made up of carbon, hydrogen and oxygen. Some lipids contain the elements nitrogen and phosphorus.The ratio of hydrogen atoms to oxygen atoms in a lipid molecule is higher than the 2 : 1 ratio in carbohydrates.Lipids are insoluble in water. However, they are soluble in other lipids and organic … Read more

Proteins are complex compounds that made up of carbon, hydrogen and nitrogen. Some proteins contain sulphur and phosphorus.It is needed by the body for growth, repair of damaged tissues and synthesis of secretions (enzymes, mucus, hormones.)Proteins are polymer that made up of monomers called amino acids. Each molecule of amino acid has one amino group (-NH2) and one carboxyl group ( -COOH).Two molecules … Read more

Polysaccharides are formed when more than two monosaccharides (usually more than hendreds) combine through condensation. Some characteristics of polysacharides are: do not dissolve in water do not taste sweet do not crystallisePolysaccharides can be hydrolysed by adding acid, boiling and action of enzymes. Examples of polysaccharides Starch storage of carbohydrate in plants. The iodine test is used for confirming the presence … Read more

01 Transport The Circulatory System (7 Questions) The Mechanism of Blood Clotting (3 Questions) The Lymphatic System (4 Questions) The Role of Circulatory System in Body Defense Mechanism (4 Questions) 02 Support and Locomotion Support and Locomotion in Humans and Animals 1 (6 Questions) Support and Locomotion in Humans and Animals 2 (6 Questions) Support System in Plants (4 Questions) 03 Coordination and Response The Role of … Read more

01 Cell Structure Cell Structure and Function 1 (6 Questions) Cell Structure and Function 2 (5 Questions) Cell Organisation 1 (5 Questions) Cell Organisation 2 (5 Questions) Cell Organisation 3 (3 Questions) 02 Movement across Plasma Membrane Movement of Substances Across the Plasma Membrane 1 (5 Questions) Movement of Substances Across the Plasma Membrane 2 (5 Questions) Movement of Substances Across the Plasma Membrane … Read more