Correct Answer: C. need and ability

Explanation

Communism is a political and economic system that seeks to create a classless society in which the major means of production, such as mines and factories, are owned and controlled by the public. it is a system of government in which all property is owned by the community and each person contributes and receives according to their ability and needs.

Correct Answer: A. introduced by a member of Parliament

Correct Answer: C. m = 0, n = 1

Explanation

Features: Sun, cloud, plant, animal ground / earth / soil and river/ water/ body/ sea/ lake/ stream/ ocean.

Processes with corresponding arrows:Precipitation / condensation in clouds; - Evaporation of water from water body, river, sea

Evaporation of water from soil or ground; Excretion by animal; Drinking by animals; Perspiration and respiration by animals; Absorption of water by roots; Transpiration by plants; Erosion or run-off water from soil; Respiration in plants; Decay in plants.

(b) Importance of water in living organisms are:

General:

(i) Life started in water

(ii) Some organisms still live in water.

(iii) All organisms contain at least 50% of water

(iv) Biochemical reactions occur in aqueous medium organisms, e.g.; gaseous exchange, digestion and absorption.

(v) It serves as food.

(vi) It increases for the growth of organisms.

(ii) Transport Medium: (Blood plasma / tissue fluid/ lymph:

(i) for excretory products; - hormones

(ii) for end products of digestion.

(iii) dispersal of larval stages of aquatic amphibians

(iv) transfer of gauntest of mosses, ferns and some animals

(v) dispersal of some seeds.

Solvent:

(I) Removal of excretory products, ammonia and urea.

(ii) Component of secretions, digestive juices, tears and venom in snakes.

Lubricant:

(i) mucus for external at movement in snails and earthworms

(ii) for internal movement in the gut and vagina

(iii) Perivisceral fluid in the fe viscera.

Support:

(i) Amniotic fluid in mammals

(ii) vitreous/ aqueous humour of the mammalian eye, tutor pressure m in the herbaceous plants

(iii) erection of penis

(iv) hemocoel in earthworms.

Miscellaneous:

(i) temperature control through sweating, panting and transpiration

(ii) endolymph and perilymph in the mammalian ear.

Correct Answer: C. acted

Correct Answer: D) nuclear, chemical, phase

Correct Answer: A. normal goods

Explanation

In economics, normal goods are any goods for which demand increases when income increases, and falls when income decreases but price remains constant, i.e. with a positive income elasticity of demand.

Correct Answer: D. emergence of important trading routes

Correct Answer: C. you

Explanation

(a) Ways ways By Which Diseases Spread On A Crop Farm: (i) rain splash (ii) use of contaminated tools and equipment. (iii) use of infected planting materials. (iv) wind blowing pathogens to other crops. (v) animals, especially predators during feeding. (vi) insect vectors (vii) visitors (viii) weeds harbour pathogens (ix) through irrigation water.

(b)(i) Symptoms of Onion Twister: (i) Twisting and curling of the leaves and the pseudostem. (ii) The twisted leaves later change from the normal darkgreen colour to yellowish green. (iii) The neck of the affected onion plant becomes abnormally long. (iv) the bulbs are narrow and elongated. (v) The bulbs rot quickly when stored. Control Measures of Onion Twister: (i) Early Planting (ii) Removal and destruction of infected plants. (ill) By spraying fungicides. (iv) Practising good farm sanitation.

(b)(ii) Symptons of Root-Knot Disease of Tomato: (i) Formation of galls or knots on the roots of infected plants. (ii) Stunted plants. (iii) The leaves turn yellow. (iv) Production of many secondary roots. (v) Death of plants. Control Measures of Root-Knot Disease of Tomato: (I) Planting resistant varieties of tomatoes. (ii) Soil treatment with nematicides. (iii) Soil sterilisation/ burning of crop residue and weeds. (iv) Practising crop rotation. (v) Removal of crop residues from the field. (vi) Weed control.