(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) 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) Differentiate between apes and man with respect to the following characteristics: (i) Posture (ii) Cranium (iii) Brow ridges (iv) Locomotion
(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) 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.