Correct Answer: C. spiny leaves

Explanation

(a) Non-governmental agricultural organisations in West Africa

- West African Rice DevelopmentAgency/Association (WARDA)

- International Institute for Tropical Agriculture (IITA)

- International Livestock Centre for Africa (ILCA)

- International Livestock Research In-structed (ILRI)

-International Fund forAgricultural Development (IFAD)

- International Crop Research Institute for semi-Arid Tropics (ICRISAT)

- Hunger project

- Adventist ReliefAgency (ADRA)

- Catholic Relief Services (CRS)

- World Vision International

- International Centre for Research in Agroforestry (ICRAF)

(b) Ways in which agriculture and industry are interrelated

- Agriculture provides food, clothing and shelter for those who work in the industry

-Agriculture provides raw materials for industries

- Agriculture provides market for industrial prod-ucts/goods such as tools, machinery

- Agriculture promotes industrial labour

- Industries add value to agricultural produce by procesing, storing, packaging and transporting them to final consumers

- Agro-chemical industries produce fertilizers, pesticides, herbicides, fungicides, drugs and feed additives which boost agricultural production

- Seed industries provide agriculture with viable and high yielding seeds

(c) Functions of parts of a disc plough

(i) disc: It cuts into the soil and turns it over

(ii) beam: Disc standards are connected to it/ Holds disc in position/provides additional greater depth

(iii) furrow wheel: stabilises the disc plough/keeps furrows wall clean (iv) disc scraper: removes soil from the disc

(v) hitch: point of attachment to the tractor

(d) Disadvantages of animal power - Animals are susceptoble to diseases and death

- power output is low

- animals can get fatigued

- animal power is not suitable for large scale production

- the use of animal power is restricted to certain climatic zones e.g tse-tse fly free zones

- animals cannot perform optimally at certain times of the day especially during hot weather

- poor handling of animals may cause poor per-formance/animals may refuse to work when poorly handled

- animal power cannot be used to perform certain farm operations such as harvesting and processing of farm produce as they may eat up the farm produce

Correct Answer: C) a moving iron ammeter

Correct Answer: C. member

Correct Answer: (a) 1991

Correct Answer: D) Light

Explanation

(a)(i)The atom has small / tiny positively charged centre / nucleus with electrons surrounding the space around the centre nucleus.

(ii) Atomic number of an element is the number of protons / electrons in an atom of the element while mass number is the sum of the protons and neutrons in the atom of the element.

(iii) Chlorine atom is made up of a mixtire of isotopes and the relative atomic 'mass of chlorine is the average of the isotopic masses.

(b)(i) Is the minimum energy required to remove one mole of an electron from c mole of gaseous atom to form one mete gaseous ion. Nucleus with

— High melting / boiling point Protons Ability to conduct electricity in the molten state or in solution

— Solid at room temperature

— Soluble in water or polar solvents / insoluble in non-polar solvents.

(iii) — Atoms of the elements in each pair have the same number of electrons

(c)(i) It is a family of organic compounds their outermost shell therefore similar chemical properties. where successive members ditter by

— CH\(_2\) molar mass of 14

— with similar chemical properties

— which conform to the same general formula

— which show gradation of physical properties whict, have the same general method of preparation, e.g, alkanes, alkenes, alkanols.

(ii) It is a process in which a covalent bond is broken in such a way that the electron pair is completely transfered to one of the atoms resulting in the formation of ions e.g. H — CI —> H\(^+\) + Cl\(^-\) / HCI --> H\(^+\) + Cl\(^-\)

(d)(i) — Methyl orange / methyl red / phenolphthalein

(ii) — Methyl orange orange / methyl red

(iii) — Phenolphthalein.

(e) E — NH\(_4\)Cl

F — NaOH, KOH or Ca(OH)\(_2\), LiOH, CsOH, Ba(OH)\(_2\), Mg(OH)\(_2\)

G — NH\(_3\)

Correct Answer: C. a reducing agent

Correct Answer: B. 10

Explanation

\(a = 2\frac{1}{2}, nth = a + (n-1)d \Rightarrow 25 = 2\frac{1}{2} + (n-1)2\frac{1}{2}\\

25 = \frac{5}{2}+(n-1)\frac{5}{2} \Rightarrow 22\frac{1}{2} = \frac{5n-5}{2}\Rightarrow \frac{45}{2} = \frac{5n-5}{2}\\

45 = 5n - 5 \Rightarrow 5n = 50 \Rightarrow n = 10\)

Correct Answer: D. Lack of adequate water