Correct Answer: C. pituitary

Correct Answer: D. it provides means for the variation of chromosome number from generation to generation

Correct Answer: A. import restriction

Correct Answer: C. Hebron

Correct Answer: B. it was meant to train assistants to Europeans

Correct Answer: D. political culture

Correct Answer: D) chromatography

Explanation

A brand of ink containing cobalt (II) and copper (II) ions can be separated into its various components usingchromatography, which is the correct option in this question.

Chromatography is a technique used to separate mixtures based on the differences in the movement of their components through a stationary phase. In the case of ink, the components are often dyes or pigments, which can be separated using paper or thin-layer chromatography.

Let's briefly discuss why the other options are not suitable for separating the components of the ink:

Fractional crystallization: This technique is used to separate components of a mixture based on their solubility. It involves dissolving the mixture in a solvent and then cooling it to form crystals of different components. However, this method is not suitable for separating components of the ink, as both cobalt (II) and copper (II) ions are likely to have similar solubilities in a solvent.

Fractional distillation: This method is used to separate components of a mixture based on their boiling points. It is commonly used for separating components of liquid mixtures, like petroleum. Since ink is a mixture of solid components in a liquid medium, fractional distillation is not an appropriate method for separating its components.

Sublimation: Sublimation is a process in which a solid directly transforms into a gas without going through the liquid phase. This method is used to separate components of a mixture that have different sublimation temperatures. However, sublimation is not suitable for separating ink components, as both cobalt (II) and copper (II) ions do not undergo sublimation.

In conclusion,chromatography is the most appropriate technique for separating the components of an ink containing cobalt (II) and copper (II) ions, as it relies on the differences in their movement through a stationary phase, allowing the separation of the components based on their interactions with the stationary phase and mobile phase.

Correct Answer: D. Observation

Explanation

(a) Five management methods adopted in the forest areas to ensure a continuous timber supply are:

(i) Forest Regulations : These are laws made by the government to conserve or preserve forest trees. No person can cut down timber without government permission.

(ii) Selective exploration: Forest trees can be cut down while allowing others to reach maturity before they too are cut

(iii) Afforestation: This is the planting of new trees to replace the ones that have been cut.

(iv) Fire prevention: This prevents annual bush burning and where possible, establishes fire breaks.

(v) Taungya system : This system allows the farmer to plant his crops after which they will plant economic trees on the same piece of land.

(b) Six benefits derived from forestry and range are:

(i) Supply of food such as fruits, seeds. bush meat, etc.

(ii) Supply of fuel (fire wood). (iii) Provision of timber for furniture and buildings.

(iv) Provision of employment to some people. (v) Forest is a source of medicinal herbs.

(vi) Provision of pulpwood for paper making.

Correct Answer: C. The West African Currency Board