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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 … 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 … 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 … 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 crystallise Polysaccharides can be hydrolysed by adding acid, boiling and action of enzymes.  Examples of polysaccharides  Starch storage of carbohydrate in plants. The iodine … 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 … 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 … Read more