Agricultural Science English Paper 1 2015 Questions and Answers Part 1

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Section A

Question 1

D ⎫⎫

B⎫⎫

D⎫⎫

A ⎫⎫

A⎫⎫

D ⎫⎫

B⎫⎫

C ⎫⎫

A ⎫⎫

D ⎫⎫ (10 x 2) (20)

Both A and B ⎫⎫

B only ⎫⎫

A only ⎫⎫

None ⎫⎫

B only ⎫⎫ (5 x 2) (10)

Biological value/BV ⎫⎫

Zinc/Zn ⎫⎫

Plywood ⎫⎫

Oogenesis/ovigenesis ⎫⎫

Reproductive ⎫⎫ (5 x 2) (10)

Pearson ⎫

Maintenance ⎫

Rectum ⎫

Acrosome ⎫

Embryo transfer ⎫ (5 x 1) (5)

Total Section A: 45

Section B

Question 2

Animal Nutrition

Alimentary Canals of Two Farm Animals

Type of digestive systems represented by:

  • Ruminant⎫

  • Cattle/cows/sheep/goat/game⎫

  • Non-ruminant/monogastric animal⎫

  • Pig⎫

Letter and name where hydrochloric acid is secreted in diagram A:

  • D⎫

  • Abomasum/true stomach/milk stomach⎫

Planning Fodder Flow Feed Flow and Fodder Flow Production

Definition of fodder flow:

  • A strategic plan⎫

  • To ensure enough fodder⎫

  • To meet the requirements of all the animals⎫

  • Throughout the year⎫

  • In terms of quality and quantity⎫ (Any 2)

Aspects in planning for a fodder flow:

  • Economic viability: The farmer to take measures of ensuring that the fodder⎫ is cost effective/cheap⎫

  • Sustainability: Planning to ensure that the fodder⎫ is always available to livestock⎫

Digestibility Co-Efficiency

Calculation of digestibility co-efficiency:

⎫

⎫

⎫

or ⎫%⎫

Implication of the Answer in Question

The bulk of the feed (62,35%) ⎫is digested and absorbed by the heifer⎫

OR

The lesser percentage of the feed (37,65%) ⎫ was not digested hence not absorbed by the heifer⎫

A Table on the Nutritive Ratio (NR)

The ration most suitable for the following:

  • Fattening of old ewes – A⎫

  • Ewes in the last 4 weeks of pregnancy – B⎫

  • Young growing animals – B⎫

Reason for the ration in 2.4.1(a):

  • Ratio is wide⎫

  • Feed has higher lipid/carbohydrate/energy content⎫

  • Feed has lower protein content⎫

  • Ewes need more energy than protein ⎫ (Any 1)

Ration with high levels of:

  • Maize – A⎫

  • Fish meal – B⎫

The implication of the nutritive ratio of ration B:

  • Ration has higher protein content⎫

  • Recommended for growth, production and reproduction⎫

  • Ration has lower lipid/carbohydrate/energy content⎫ (Any 2)

Diagram on Mineral Supplements

Method of mineral supplement:

Mineral lick⎫

Two minerals that could be supplemented:

Calcium⎫

Sodium⎫

Phosphorus⎫

Nitrogen⎫ (Any 2)

The partial protein substitute:

Non-protein nitrogenous substance (NPN)/biuret/urea⎫

Role of growth regulators:

  • Hormones – will stimulate metabolic reactions⎫ that will lead in increased growth rate⎫

  • Antibiotics – will provide immunity⎫ thereby increasing resistance to diseases⎫

Question 3

Animal Production, Protection and Control

Animal Production Systems

Identification of animal production systems:

  • A: Extensive production system⎫

  • B: Intensive production system⎫

Comparison of the Two production systems:

  • Capital investment – Low capital/technology input in extensive production system ⎫ and large capital/technology input in intensive production system⎫

  • Area/space of land occupied – Low animal concentration in a large area in extensive production system⎫ and high animal concentration in a small area in intensive production system⎫

Two examples of intensive production system:

  • Cage⎫

  • Battery (layers/broilers) ⎫

  • Deep litter system ⎫ (Any 2)

Structures/Practices for Handling Animals

  • A single strand of movable electrical wire⎫

  • A rope with a halter to tie animals to a pole⎫

  • A separate crush⎫

  • Single strand of movable electric wire⎫

Scenario on Solar Radiation

Three measures to reduce heat stress under intensive conditions:

  • Spray/Fugger with water⎫

  • Insulation⎫

  • Fans/conditioners/ventilators⎫

  • Housing systems/orientation⎫ (Any 3)

Correlation between high environmental temperature and feed consumption:

  • The higher the temperature ⎫

  • the less the feed intake⎫

Data on Average Body Temperature and Pulse Rate in Dairy Cows

Line graph on the volume of stimulant and the growth response:

The Line graph

The Line Graph

Loading image•••

Line graph of growth stimulants against growth response Criteria/marking guidelines:

  • Correct heading⎫

  • Y-axis – correct labelling (growth response)⎫

  • X-axis – correct labelling (volume of growth stimulants)⎫

  • Correct units⎫

  • Accuracy/correct plotting⎫

  • Line graph⎫