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SS3: AGRICULTURAL SCIENCE - 1ST TERM

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  1. Crop Improvement | Week 1
    9 Topics
    |
    1 Quiz
  2. Animal Improvement | Week 2
    6 Topics
    |
    1 Quiz
  3. Animal Health Management I - Introduction | Week 3
    7 Topics
    |
    1 Quiz
  4. Animal Health Management II | Week 4
    5 Topics
    |
    1 Quiz
  5. Animal Health Management III | Week 5
    7 Topics
    |
    1 Quiz
  6. Aquaculture | Week 6
    11 Topics
    |
    1 Quiz
  7. Apiculture or Bee-keeping | Week 7
    10 Topics
    |
    1 Quiz



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Content:

  • Theory Questions & Answers
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Evaluation Questions – Animal Health Management III:

1. The diagrams below illustrate parasites of farm animals.

theory agric

Study them and answer the questions that follow.

(a) Identify the parasites labelled I and II

(b) Mention three external features of the parasite labelled I

(c)
(i) Name the part of the body of the host where the parasite labelled II is found.
(ii) State four adaptive features of the parasite labelled II on its host. 
(iii) List two intermediate hosts of the parasite labelled II

(d) State three effects of the parasite labelled I on its host.

2. (a) What is zoonotic disease?

 

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Evaluation – Animal Health III

1. The diagrams below illustrate parasites of farm animals.

Study them and answer the questions that follow.

(a) Identify the parasites labelled I and II.

Answer:

I – Louse
II – Tapeworm

 

(b) Mention three external features of the parasite labelled I

I ⇒ Louse

Answer:

  • Head
  • Thorax
  • Three pairs/six legs with sharp claws
  • Segmented abdomen
  • A pair of Antennae
  • A pair of compound eyes
  • Mouthparts of biting and sucking

 

(c)

(i) Name the part of the body of the host where the parasite labelled II is found.

II ⇒ Tapeworm

Answer: Small Intestine

(ii) State four adaptive features of the parasite labelled II on its host.

Answer:

II ⇒ Tapeworm

  • Possesses four suckers with which it attaches itself to the walls of the intestine of its host.
  • Possesses two rows of hooks with which it fixes itself into the intestine for a firm grip.
  • The whole body is covered with cuticle which prevents it from being digested by the digestive enzymes of its host
  • Has the ability to absorb products of digestion with its entire body since it has no digestive system of its own.
  • Its excessive length increases surface area for absorption
  • Produces many proglottides full of eggs.
  • Rostellum forms part of appendages for attachment
  • Bodies are covered with hard cuticle covering, through which they absorb food.

(iii) List two intermediate hosts of the parasite labelled II.

Answer:

II ⇒ Tapeworm

  • Cattle
  • Pigs

(d) State three effects of the parasite labelled I on its host.

Answer:

  • They cause discomfort and irritation to farm animals.
    • Irritation results in scratching and restlessness;
    • this creates wounds which become sources of secondary infection.
  • They suck blood from animals leading to anaemia.
  • They reduce the production or yield of animals.
  • They transmit diseases.
  • They reduce feed and water intake.

 

2.  (a) What is zoonotic disease?

Answer:

Zoonotic diseases are infectious diseases that are transmitted from animals to humans.

 

(b) Name three zoonotic diseases.

Answer:

  • Covid-19
  • Bird flu
  • Malaria
  • Ebola

 

(c) Differentiate between ectoparasites and endoparasites.

Answer:

Ecto-parasites are those found living on the external parts of the body, especially the skin.

Endo-parasites are those organisms which live inside the tissue of animals from where they obtain food.

 

(d) State three damage done by ticks and how it could be controlled.

Answer:

  • Damage to animal skins
  • Anaemia especially in sheep
  • Death of host may occur
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