Get a copy of the KCSE 2024 ENGLISH REVISION BOOKLET ANSWERS AND QUESTIONS. This booklet consist of up to 20 consolidated English 2024 Mock papers from Top National Schools and Joint Exams. They come with a comprehensive and well coordinated Marking scheme making it a great and valuable resource for your revision!

Get a copy of the KCSE 2024 CHEMISTRY REVISION BOOKLET ANSWERS AND QUESTIONS. This booklet consist of up to 20 consolidated Chemistry 2024 Mock papers from Top National Schools and Joint Exams. They come with a comprehensive and well coordinated Marking scheme making it a great and valuable resource for your revision!

Get a copy of the KCSE 2024 MATHEMATICS REVISION BOOKLET ANSWERS AND QUESTIONS. This booklet consist of up to 20 consolidated Mathematics 2024 Mock papers from Top National Schools and Joint Exams. They come with a comprehensive and well coordinated Marking scheme making it a great and valuable resource for your revision!

Get a copy of the KCSE 2024 PHYSICS REVISION BOOKLET ANSWERS AND QUESTIONS. This booklet consist of up to 20 consolidated Physics 2024 Mock papers from Top National Schools and Joint Exams. They come with a comprehensive and well coordinated Marking scheme making it a great and valuable resource for your revision!

One of the largest, highly diverse and widely distributed groups in the animal kingdom • Very abundant - numbers extremely high (more than 60,000 described species (with an estimated 500,000 more still undescribed) • Habitat - both aquatic and terrestrial (many free-living & parasitic

Includes crabs, lobsters, prawns, barnacles, pill bugs, copepods, crayfishes, water fleas, shrimps, etc

Active body cells require lots of oxygen for energy production in aerobic respiration as we learnt in Lecture IV. A major by product of aerobic respiration is carbon dioxide. Carbon dioxide dissolves in water to form carbonic acid and hence disturbs acid base balance in the body. Accumulation of carbon dioxide is therefore toxic to the cells as it may cause acidosis. Living cells have mechanisms of intake of oxygen and elimination of carbon dioxide. The two gases are known as respiratory gases. In small organisms such as protozoans the body surface provides an adequate surface area for the exchange of respiratory gases by diffusion. In mammals and other higher animals there are specialized systems for exchange of respiratory gases.

Once an insect hatches from the egg it is usually able to survive on its own, but it is small, wingless, and sexually immature. Its primary role in life is to eat and grow. If it survives, it will periodically outgrow and replace its exoskeleton (a process known as moulting). • In many species, there are other physical changes that also occur as the insect gets older (e.g., growth of wings and development of external genitalia)

Five classes of Uniramia are recognized: 1. Class Diplopoda (millipedes) 2. Class Chilopoda (centipedes) 3. Class Symphyla (sympylids) 4. Class Pauropoda (pauropods) 5. Class Insecta (insects) Centipedes, millipedes, symphylids and pauropods are collectively called myriapodous arthropods (Myriapods). All have long trunks with many segments and appendages, most of which are walking legs.

Insect Hormones • A hormone is a chemical signal sent from cells in one part of an organism to cells in another part (or parts) of the same individual. They are often regarded as chemical messengers. • Typically produced in very small quantities, but cause profound changes in their target cells • Their effect may be stimulatory or inhibitory • In some cases, a single hormone may have multiple targets and cause different effects in each target • Examples of processes controlled by hormones include moulting, metamorphosis, oocyte development (vitellogenesis), colour change and diurnal rhythms of activity