Question 4
The diagram below illustrates a cross-section of an organ in farm animals. Study it and answer the questions that follow.
(a) Name the parts labelled I, II, III and IV. (4 marks)
(b) (i) Name the product which could be secreted from the illustrated organ. (1 mark)
(ii) Outline two steps involved in collecting the product mentioned in 4 (b)(i). (2 marks)
(c) Complete the table below on the number of the illustrated organ which can be found in four named farm animals.
Farm animal |
Number of organ |
………………………………. |
……………………………… |
………………………………. |
……………………………… |
………………………………. |
……………………………… |
……………………………….. |
………………………………. |
(8 marks)
Observation
(a) Many candidates could only mention the teat as part of the udder but were unable to identify
the alveoli, gland cistern and teat cistern.
(b) Many candidates were unable to outline the steps involved in collecting milk as well as state
the number of teats in rabbits and pigs
The expected answers include:
4.
(a) Naming of parts
I - Alveoli
II - Gland cistern/milk cistern
III - Teat cavity/cistern
IV - Teat
(b) (i) Product secreted from the illustrated organ
- Milk
(ii) Steps involved in collecting the product secreted from the
illustrated organ
- The teat should be cleaned before milking
- Dry the teats
- Protect or lubricate the hand
- Strip each teat 3-4 times
- Place a bucket underneath the udder
- Wrap a hand around the teats
- Squeeze down to push out the milk
- Continue milking until the quarter of the udder is deflated
- Clean the udder
(d) Number of udder in farm animals
- Pig : 12 - 16
- Rabbit : 8 – 10
- Cow : 4
- Sheep : 2
- Goat : 2