(a) What is Land Tenure System (b) Define Weed (c) Discuss Groundnut rosette disease under the following sub-headings. (i) Causal organism (ii) Mode of tran...

(a) Land tenure system

Land tenure system is the system of customs and laws by which land is owned, acquired, held, controlled and used by individuals or a community. It defines the rights a person or group has over a piece of land.

(b) Weed

A weed is any plant growing where it is not wanted, that is, a plant growing out of place and competing with cultivated crops for nutrients, water, light and space.

(c) Groundnut rosette disease

• (i) Causal organism: Groundnut rosette virus (a virus complex).
• (ii) Mode of transmission: Transmitted by the aphid vector Aphis craccivora.
• (iii) Symptoms: Stunted growth; yellowing (chlorosis) and mottling of leaves; curling and reduction in leaf size giving a bushy, rosette appearance; few or no pods; drastic reduction in yield.
• (iv) Control: Plant resistant varieties; early planting; close spacing; control the aphid vector with insecticides; rogue out and destroy infected plants; practise crop rotation.

(d) Characteristics of the factors of production

(i) Land

• It is a free gift of nature.
• It is fixed in supply and immobile.
• It is heterogeneous, varying in quality and fertility.
• It is subject to the law of diminishing returns; its reward is rent.

(ii) Capital

• It is a man-made factor of production.
• It is mobile and its quantity can be increased or decreased.
• It depreciates or wears out with use.
• It is used to produce other goods; its reward is interest.