(a) Persons suffering from G6PD deficiency are resistant to malaria. Explain.
(b) Define:
(i) Genetic Erosion (ii) Bioinsecticides (iii) Antigen (iv) Psychosis
(c) Define Biofortification.
(a) Deficiency of Glucose 6– phosphate dehydragenase causes deformities in RBC, which is an essential metabolite for the survival of the malaria causing parasite leading to the death of malarial parasite.
(b) (i) Genetic Erosion— It is loss of genes from the gene pool of an organism.
(ii) Bioinsecticides—Are plant or animal materials that have been found useful in controlling harmful insects.
(iii) Antigen — Any protein or a polysaccharide that triggers the production of antibodies.
(iv) Psychosis — It is a type of mental illness in which patients loose touch with reality.
(c) Biofortification is an additional instrument in the fight to reduce micronutrient malnutrition one that uses food as a mechanism to improve human health. By producing stable foods whose edible portions are more dense in bioavailable minerals and vitamins, scientists provide farmers with crop varieties that reduce nutritionally related health problems of people.
(a) What are tropic hormones ? Describe the feedback control of tropic hormones with an example.
(b) Explain the conduction of nerve impulse through a nerve fibre.
(c) Draw a labelled diagram of the T.S. of bone.
(a) State four characteristics of the Cromagnon man.
(b) Explain the basic postulates of Darwinism.
(c) Archaeopteryx is a connecting link between reptiles and birds. Justify the statement by giving two characteristics of each group.
(a) Mention one role and one deficiency symptom of the following elements in plant nutrition:
(i) Phosphorus (ii) Iron (iii) Chlorine
(a) Give four differences between root apex and shoot apex.
(b) Explain the development of the different types of endosperms in angiosperms.
(c) Explain briefly: (i) Capillary water (ii) Osmosis (iii) Aeroponics
(a) List the activities of Community Health Services.
(b) Give three early diagnostic symptoms of cancer.
(c) Define: (i) Carrying capacity (ii) Implant (iii) Carcinoma
(a) Differentiate between apes and man with respect to the following characteristics: (i) Posture (ii) Cranium (iii) Brow ridges (iv) Locomotion
