Correct Answer: A. ability to endure low light intensity

Explanation

(a) Difference between subsistence agriculture and commercial agriculture

Subsistence Agriculture

• Production is mainly for family consumption
• Less capital is required
• Uses family labour/unskilled labour
• Use of local breeds of animals
• Use of local crop varieties
• Hardly use agro-chemicals/Cultural methods are used to control pests and diseases
• Records are rarely kept Use of primitive/local tools
• Poor housing facilities for rearing animals
• Peasant farmers are involved
• Doer not require improved processing facilities
• Does not involve any marketing Uses crude storage facilities
• Yield per unit area is low
• Food crops are produced
• Small area of land is cultivated
• Use of inorganic fertilizers is limited

Commercial Agriculture

• Production is mainly for sale
• Huge amount of capital is required
• Skilled/hired labour is employed
• Use of exotic/improved breeds of animals
• Use of improved crop varieties
• Mostly use agro-chemicals
• Records are kept Mechanized/use of machines
• Modern housing facilities for rearing animals
• Farmers involved may be rich
• Requires improved processing facilities
• Requires organised market Uses modern storage facilities
• Yield per unit area is high
• Cash crops are produced
• Large area of land may be cultivated
• Frequent use of inorganic fertilizers

(b) Advantages and Disadvantages of sources of farm power

(i) Wind :

Advantages

- Running cost is low

- Wind is safe to use

-Wind is a renewable source of energy

- Wind power is environmentally friendly

Disadvantages

-Wind energy converters work only during windy period and as such lie idle during less windy months/ Excessive variation in wind regimes can adversely affect the cost effectiveness of wind energy

-Too weak a wind force cannot be used for any work Success in exploitation of wind energy highly depends

on the specific site

- Wind mills occupy a large portion of land

- Requires high technical expertise

- Initial cost may be high

(ii) Internal Combustion Engine:

Advantages

- It is versatile/can be used for many farm operations

- Efficient source of power

-Not weather dependent

Disadvantages

-A high capital investment is required

- It requires specialized skills in its operation and maintenance

- In developing countries, there is inadequate spare parts for machines

-It contributes to the degradation of the environment/ It Exhaust gases pollute the environment

-Use is subject to to vagaries of fuel shortage

(iii) Electricity

Advantages:

-A very efficient source of farm Power

-it is versatile, with many valued uses

- It is a clean source of power •

-A large amount of energy can be supplied

- It is a fairly reliable source of farm Power

Disadvantages

-High capital outlay to set up

- Very dangerous to operate

- In developing countries, supply cannot be guaranteed at all time

-Needs technical know-how '

-Maintenance cost is high

Explanation

a.

Median position = \(\frac{∑F + 1}{2}\) (since ∑F is odd so we added 1)

\(\frac{27 + 1}{2} = \frac{28}{2}\) = 14th position.

counting down the frequency column, the median position occurs at 4. Therefore, the median height is 5m.

b

i. mean(x?) = \(\frac{Σfx}{Σf}\)

= \(\frac{144}{27}\)

∴ x? = 5.3m ( to 1 d.p)

ii.

Standard deviation = \(\sqrt{vaiance} = \sqrt{\frac{Σfx^2}{Σf} - (\frac{Σfx}{Σf})^2}\)

S D = \(\sqrt{\frac{834}{27} - (\frac{144}{27})^2}\)

S.D = \(\sqrt{30.888 - (5.333)^2}\)

= \(\sqrt{30.888 - 28.441}\) = \(\sqrt{2.447}\) = 1.5738 ≈ 1.6 ( to 1 d.p)

Correct Answer: C. public limited company

Explanation

A state-owned enterprise (SOE) is a business enterprise where the government or state has significant control through full, majority, or significant minority ownership. Defining characteristics of SOEs are their distinct legal form and operation in commercial affairs and activities. When a state owned stocks are traded in the stock exchange, they become a public limited company.

Correct Answer: D. lago

Correct Answer: C. old fashioned

Correct Answer: B. June 21

Correct Answer: C. i = 80k, ii = N4.80k

Correct Answer: D. planting resistant varieties

Correct Answer: D. resource allocation

Explanation

The fundamental economic problem is the issue of scarcity and how best to produce and distribute these scare resources. Scarcity means there is a finite supply of goods and raw materials. Finite resources means they are limited and can run out