NSC Agricultural Sciences Animal Reproduction: 4.1 Match EACH of the statements

Question

4.1 Match EACH of the statements with the organs listed below. Write down ONLY the letters (A–G) next to the question numbers (4.1.1 to 4.1.4).

4.1.1 A cylindrical structure responsible for implantation
4.1.2 A single tightly coiled tube that stores spermatozoa until maturity
4.1.3 The structure where the egg cell and the sperm cell unite to form a zygote
4.1.4 An elastic tube for copulation that receives semen during mating

A Fallopian tube
B Scrotum
C Uterus
D Epididymis
E Vagina
F Testis
G Ovary

4.2 Name the hormone that plays a role in EACH of the situations represented by QUESTIONS 4.2.1 to 4.2.4 below.

4.2.1 Stimulates the growth, development and functioning of the Graafian follicles
4.2.2 Develops the secondary sex organs and onset of behavioural oestrus
4.2.3 Initiates the secretion of FSH and suppresses development of follicles preventing cows from coming into heat
4.2.4 Regulates the growth and development of the dominant follicle and maturation of the oocytes.

4.3 Sterility and infertility in farm animals are caused by several factors.

Name the condition stated below which leads to sterility in farm animals:

4.3.1 Underdeveloped testis or ovaries
4.3.2 Testis stay attached to the body cavity and do not move down to the scrotum

4.4 The table below represents the duration (in days) of the different stages of the oestrus cycle in different farm animals.

STAGES OF OESTRUS CYCLE   CATTLE (DAYS)  SHEEP (DAYS)  PIGS (DAYS)  GOATS (DAYS)  HORSES (DAYS)
Pro-oestrus                        4                       2                          3                  2                     3
Met-oestrus                     4                      10                         13                11                   12
Di-oestrus                        14                     10                          12               12                   10

4.5 Beef farmers have a common practice of administering hormones to a group of cows making them come to heat at approximately the same time.

4.5.1 Name the process referred to in the statement above.

4.5.2 Indicate TWO methods used when performing the process named in QUESTION 4.5.1 above.

4.5.3 State TWO disadvantages of the process named in QUESTION 4.5.1 above.

4.6 A reproductive technique where semen is collected from superior bulls and placed into the reproductive tract of cows in oestrus is practiced on farms.

4.6.1 Identify the reproductive technique in the statement above.

4.6.2 Indicate TWO methods of collecting semen.

4.6.3 State ONE advantage of the reproductive technique identified in QUESTION 4.6.1 above.

4.7 The diagrams below illustrate multiple births in farm animals.

4.7.1 Identify the types of twins illustrated in DIAGRAMS A and C.

4.7.2 Indicate the DIAGRAM (A and C) that represents the twins with the following characteristic:
(a) Are of the same sex
(b) Physical appearance differ

4.7.3 Give the term that refers to the female in DIAGRAM B.

4.7.4 State the condition of the female in DIAGRAM B that will affect breeding negatively.

4.8 The diagrams below represent particular stages of parturition in a cow.

4.8.1 Identify the stages of parturition illustrated in DIAGRAMS A and B.

4.8.2 Indicate the stage of parturition that follows the stage in DIAGRAM A.

4.8.3 State ONE behavioural sign displayed by a cow when approaching the stage represented in DIAGRAM A.

4.1 Match EACH of the statements with the organs listed below - NSC Agricultural Sciences - Question 4 - 2024 - Paper 1

Worked Solution & Example Answer:4.1 Match EACH of the statements with the organs listed below - NSC Agricultural Sciences - Question 4 - 2024 - Paper 1

4.1.1 A cylindrical structure responsible for implantation

4.1.2 A single tightly coiled tube that stores spermatozoa until maturity

4.1.3 The structure where the egg cell and the sperm cell unite to form a zygote

4.1.4 An elastic tube for copulation that receives semen during mating

4.2.1 Stimulates the growth, development and functioning of the Graafian follicles

4.2.2 Develops the secondary sex organs and onset of behavioural oestrus

4.2.3 Initiates the secretion of FSH and suppresses development of follicles preventing cows from coming into heat

4.2.4 Regulates the growth and development of the dominant follicle and maturation of the oocytes

4.3.1 Name the condition stated below which leads to sterility in farm animals:

4.3.2 Testis stay attached to the body cavity and do not move down to the scrotum

4.4 Combined bar graph to represent the duration of the pro-oestrus and di-oestrus in different farm animals