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Economic importance of the housefly and how it is controlled.    The housefly is a vector which helps in spreading about […]

Transport of oxygen in mammalian body. Oxygen in alveoli diffuses into capillaries of lungs; In capillaries it enters Red Blood

Oxygen concentration:  high oxygen results in high rate of respiration /  low oxygen leads to low respiration hence little energy.

Digestion of Beef in the Mouth The food is mechanically broken down by chewing and grinding It is moistened by

A leaf id adapted to Photosynthesis in the following ways: Leaves contain numerous chloroplasts which help in photosynthesis; Leaves have

MARKING SCHEME BIOLOGY F2 1.Chloroplast ; (1mk) b) B: (1mk) c) A – Grana; contain chlorophyll, which traps light energy

1. They are felt needs 2. They cannot be postponed. 3. They must be satisfied before secondary wants 4. Lack