(a) Mention one role and one deficiency symptom of the following elements in plant nutrition:
(i) Phosphorus (ii) Iron (iii) Chlorine
|
Role |
Deficiency symptom |
|
|
Phosphorus |
A constituent of cell membranes, nucleic acids and nucleotides, certain coenzymes and ATP, influences nitrogen metabolism used in phosphorylation of sugars in respiration. |
Stunted growth chlorosis, dead necrotic areas on leaf. |
|
Iron |
Constituent of electron carriers and certain enzymes Ferradoxin acts as a activator for enzymes. |
Interveinal chlorosis induces chloroplast disintegration. |
|
Chlorine |
Maintains electrical osmotic and anion cation balance across cell membrane, essential for 02 evolution in photosynthesis. |
Chlorosis wilting of leaves, stunted root growth and reduced fruiting. |
(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) 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) 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) 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) 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) Differentiate between apes and man with respect to the following characteristics: (i) Posture (ii) Cranium (iii) Brow ridges (iv) Locomotion
