Fisheries Level 3 semester 1 all question
Hajee Mohammad Danesh Science and Technology University, Dinajpur
11. Se. Fisheries (Hons.) Level 3 Semester I (January-June 2018)
Course Title: Fish Physiology
Course Code FBG-301 Credit hours: 3.0
Full Marks: 90
Duration: 3 hrs
The figures in the right margin indicate full marks. Draw labelled diagram/s whenever necessary. Split of answering of a question is not acceptable.
Section - A
5x9-45
Answer any five of the following questions
1+2-3.0
4.0
a) Define thermal regulation. Why do animals heed thermal regulation?
b) Classify animals based on thermal regulation. c) Differentiate between vasoconstriction and vasodilation.
2.0
6.0
a) Describe the digestion mechanisms of different classes of food. b) Why is stomach wall not digested by HCI?
3.0
1+5-6.0
3. a) Define blood. Mention the functions of blood.
b) What do you know about pacemaker celis?
3.0
1+3-4.0 5.0
4. a) Define excretion. What are the importance of excretion? (b) Classify animals based on their excretory end products.
3.0
a) Why do fishes need an osmoregulatory mechanism?
b) How osmoregulation differs between freshwater and marine fishes?
6.0
4.0 5.0
6 a) Classify fishes based on their reproductive modes.
b) Illustrate the stages of spermatogenesis.
4.5×2-9.0
7.
Write notes on the following
7-a) Fish kidney b) Light organs in fish
36.
CS
CamScanner
Section - B
5x9-45
6.0 3.0
Answer any five of the following questions
a) Describe the mechanisms of temperature regulation in fish. b) What do you know about endothermic fishes?
5.0 .4.0
2)
Why do herbivore fishes have longer intestine than carnivore fishes? b) Describe digestive glands with their functions.
3.0
6.0
3. a) Classify the phases of metabolism. b) Describe different levels of metabolism in fish.
2.0
3.0
4a) What is circulatory system? b) Differentiate between closed and open circulatory system.
c) Describe the factors that affect cardiovascular system.
4.0
4.0
5. a) Explain fish gill as an efficient respiratory organ.
Describe necessory respiratory organs in fishes.
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