Long Answer Type(a) Explain four measures to control population explosion.
(b) Write the causative agent and main symptoms of the following diseases
(i) Tuberculosis (ii) Tetanus
(iii) Hepatitis (iv) Malaria
(c) Write two differences between benign tumour and malignant tumour.
(a) Define:
(i) Vestigeal organs
(ii) Sympatric speciation
(iii) Mutagens
(iv) Biogeography
(b) Archaeopteryx is considered a connecting link between reptiles and birds. Justify the statement by giving two characteristics of each group.
(c) Give two differences between natural selection and artificial selection.
(i) Vestigeal organ: Vestigeal organs are those organs which are non functional in the possessor but were functional in their ancestor and in related animals.
(ii) Sympatric populations are those population which inhabit the same geographical area.
(iii) Mutagens: Any agent (physical or environmental) that can induce a genetic mutation or can increase the rate of mutation.
(iv) Biogeography: is the study of the geographic distribution of life-forms on earth.
(b) Archaopteryx is a connecting link between reptiles and birds Archeopteryx has reptile feature are the presence of teeth in Jaw, a long tail with free caudal vertebrae, a neak and keel-less sternum its avian character include presence of feathers on the body, fore limbs modified into wings and four toes in foot adapted for perching.
(c)
| Natural Selection | Artificial selection |
| Natural selection is also a process where traits are selected for, but that selection is based upon a trait that gives the organism a mating or survival advantage and this allows them to pass down the traits they possess. | Artificialselection is when mankind chooses certain traits in plants and animals and breeds to enhance that trait. |
|
|
Depends on the need of the person. |
a) Write four characteristics that have developed during human evolution.
(b) What are stem cells? Write two applications of stem cell in medical treatment.
(c) Mention three basic ways to conserve plant resources.
Switch
