The diagrams below illustrate parasites of farm animals
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) Name the part of the body of the host where the parasite labelled II is found.
(i) State four adaptive features of the parasite labelled II on its host.
(ii) List two intermediate hosts of the parasite labelled II.
d) State three effects of the parasite labelled I on its host.
e) State three effects of the parasite labelled I on its host.
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) Name the part of the body of the host where the parasite labelled II is found.
(i) State four adaptive features of the parasite labelled II on its host.
(ii) List two intermediate hosts of the parasite labelled II.
d) State three effects of the parasite labelled I on its host.
e) State three effects of the parasite labelled I on its host.
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Correct Answer: Option
Explanation:
(a)(i) Identification of the Parasites
I seed
II seed
(b) External features of the parasite labelled I (Louse)
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) Part of the body of the host where the parasite labelled II (Tapeworm) is found
Small Intestine
(d)(i) Adaptive features of the parasite labelled II (Tapeworm) on its host
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
(ii) Intermediate hosts of the parasite labelled II (Tapeworm)
Cattle
Pigs
(e) Effects of the parasite labelled I (Louse) on its host
The host becomes restless due to skin irritation
Loss of appetite
Loss of weight
Reduction in livestock production
Causes loss of hairs or feathers
Injuries caused may serve as source of secondary infection
It sucks blood of host leading to anaemia
It eventually leads to death
(a)(i) Identification of the Parasites
I seed
II seed
(b) External features of the parasite labelled I (Louse)
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) Part of the body of the host where the parasite labelled II (Tapeworm) is found
Small Intestine
(d)(i) Adaptive features of the parasite labelled II (Tapeworm) on its host
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
(ii) Intermediate hosts of the parasite labelled II (Tapeworm)
Cattle
Pigs
(e) Effects of the parasite labelled I (Louse) on its host
The host becomes restless due to skin irritation
Loss of appetite
Loss of weight
Reduction in livestock production
Causes loss of hairs or feathers
Injuries caused may serve as source of secondary infection
It sucks blood of host leading to anaemia
It eventually leads to death