NSC Agricultural Sciences Animal Reproduction: The diagram below illustrates pa

Question

The diagram below illustrates parts of the reproductive system of a male farm animal.

4.1.1 Identify B and C.

4.1.2 Indicate the hormone secreted by A.

4.1.3 Name the condition that occurs when A remains in the body cavities.

4.1.4 Explain the role of B in regulating the temperature of A.

4.2 In livestock production the semen of superior animals is collected, diluted and preserved for future use.

4.2.1 Name TWO methods that can be used to collect semen.

4.2.2 Give TWO requirements for the collection of semen.

4.2.3 State TWO functions of semen diluents.

4.2.4 State the temperature required for storing semen in liquid nitrogen for a longer period of time.

4.3 The diagram below shows a process taking place during the reproduction cycle of a cow.

4.3.1 Identify the process illustrated in the diagram above.

4.3.2 Name the type of cell division responsible for the formation of the following:

(a) Cells labelled A

(b) Cells labelled B

4.3.3 State the purpose of the cell division in QUESTION 4.3.2(a).

4.3.4 Name the organ where EACH of the following cells can be found:

(a) Spermatogonium

(b) Oogonium

4.4 The table below shows the percentage (%) of butter fat and crude fibre in the milk of dairy cows during weeks 5–45 of lactation.

4.4.1 Draw a combined bar graph representing the butter fat and crude fibre percentages for weeks 5–25 of lactation.

4.4.2 Deduce, from the table above, the trend of crude fibre from weeks 25 to 45.

4.5 The illustration below shows the developing embryo in the uterus of a cow.

4.5.1 Write down only the letter (A to F) of the part in the picture above that matches each of the following descriptions:

(a) The part that brings the blood of the cow and the foetus in close contact without mixing it.

(b) The membrane that collects the urine from the foetus.

(c) The membrane surrounding the foetus closest to the uterus of the cow.

4.5.2 State TWO functions of part D.

4.6 The milk produced by the cow during the first three days after parturition differs from the normal milk.

4.6.1 Name the milk that is produced during the first three days after parturition.

4.6.2 Give TWO reasons why it is important that a newborn calf receives the milk named in QUESTION 4.6.1.

4.6.3 Give the term that refers to the period when milk production is at its highest point.

The diagram below illustrates parts of the reproductive system of a male farm animal - NSC Agricultural Sciences - Question 4 - 2022 - Paper 1

Worked Solution & Example Answer:The diagram below illustrates parts of the reproductive system of a male farm animal - NSC Agricultural Sciences - Question 4 - 2022 - Paper 1

Identify B and C.

Indicate the hormone secreted by A.

Name the condition that occurs when A remains in the body cavities.

Explain the role of B in regulating the temperature of A.

Name TWO methods that can be used to collect semen.

Give TWO requirements for the collection of semen.

State TWO functions of semen diluents.

State the temperature required for storing semen in liquid nitrogen for a longer period of time.

Identify the process illustrated in the diagram above.

Name the type of cell division responsible for the formation of the following:

State the purpose of the cell division in QUESTION 4.3.2(a).

Name the organ where EACH of the following cells can be found:

Draw a combined bar graph representing the butter fat and crude fibre percentages for weeks 5–25 of lactation.

Deduce, from the table above, the trend of crude fibre from weeks 25 to 45.

Write down only the letter (A to F) of the part in the picture above that matches each of the following descriptions:

State TWO functions of part D.

Name the milk that is produced during the first three days after parturition.

Give TWO reasons why it is important that a newborn calf receives the milk named in QUESTION 4.6.1.

Give the term that refers to the period when milk production is at its highest point.

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