The diagrams below illustrate the reproductive systems of cattle - NSC Agricultural Sciences - Question 4 - 2021 - Paper 1
Question 4
The diagrams below illustrate the reproductive systems of cattle.
DIAGRAM A DIAGRAM B
4.1.1 Identify the diagram (A or B) above that repr... show full transcript
Worked Solution & Example Answer:The diagrams below illustrate the reproductive systems of cattle - NSC Agricultural Sciences - Question 4 - 2021 - Paper 1
Step 1
Identify the diagram (A or B) above that represents the reproductive system of a cow.
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Answer
The correct diagram representing the reproductive system of a cow is Diagram A.
Step 2
Give ONE visible reason in the diagram for the answer to QUESTION 4.1.1.
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Answer
One visible reason is the presence of an ovary in Diagram A.
Step 3
Name parts C and G.
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Part C is the Cervix, and part G is the Cowper's/bulbo-urethral glands.
Step 4
Give a function of EACH of the following: Part B.
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Part B functions as the site where the zygote is implanted and develops.
Step 5
Give a function of EACH of the following: The fluid secreted by part F.
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The fluid secreted by part F provides nutrients to the sperm cells, protects them against pH changes, helps maintain their health, and improves the mobility of the spermatozoa.
Step 6
Identify the letter representing the part where gametes are formed in diagram B.
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The letter representing the part where gametes are formed in Diagram B is E.
Step 7
Rearrange the stages of mating above in their chronological order.
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Answer
A bull shows interest in a cow.
A bull stands on his rear legs and rests on the rear end of the cow.
A bull gains intromission into the vagina.
Semen is released into the vagina.
Step 8
State the stage NOT indicated above.
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The stage not indicated above is Dismounting.
Step 9
Name the hormone that regulates the mating behaviour in bulls.
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The hormone that regulates mating behaviour in bulls is Testosterone.
Step 10
Identify the letter (A or B) representing the following hormones: Oestrogen.
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The letter representing Oestrogen is A.
Step 11
Identify the letter (A or B) representing the following hormones: Progesterone.
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The letter representing Progesterone is B.
Step 12
Name the stage in the oestrus cycle: Between day 2 and day 6.
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The stage in the oestrus cycle between day 2 and day 6 is Pro-oestrus.
Step 13
Name the stage in the oestrus cycle: At day 14.
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The stage in the oestrus cycle at day 14 is Oestrus.
Step 14
The cow fell pregnant on day 16. Refer to the hormonal levels to justify this statement.
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On day 16, the Oestrogen level dropped while the Progesterone level increased and was maintained, indicating hormonal conditions necessary for pregnancy.
Step 15
Name the stage in a normal reproductive cycle of a cow 282 days after insemination.
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The stage in a normal reproductive cycle of a cow 282 days after insemination is Parturition/calving.
Step 16
Draw a bar graph showing the milk yield of the two groups of lactating cows.
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To draw the bar graph, ensure to label the x-axis as 'Weeks' and the y-axis as 'Milk Yield (litres)'. Each group's yield should be represented accurately.
Step 17
Compare the milk yield in both groups over the weeks.
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Group 1 initially increased in milk yield, peaked, and then decreased. Group 2 showed a gradual increase followed by stabilization.
Step 18
State the function of the apparatus in PICTURE A and the equipment in PICTURE B during AI.
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The apparatus in PICTURE A is used for depositing semen into the reproductive tracts of a cow. The equipment in PICTURE B is for the storage of semen.
Step 19
Name the reproductive part where the apparatus in PICTURE A is placed during AI.
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The apparatus in PICTURE A is placed in the Cervix/uterus during AI.
Step 20
Name TWO basic requirements when the equipment in PICTURE B is used.
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Semen should be stored at 5 °C for short periods.
Semen should be stored for longer periods in liquid nitrogen at -196 °C.
Step 21
State TWO challenges of using the equipment in PICTURE B.
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Expensive maintenance costs.
Challenges in handling and maintenance of the equipment.
