1st Year Biology Chapter 13 Notes
Important Complete 1st Year Biology Chapter 13 Notes written by Professor Mr. Adnan Haider Suib. These notes are very helpful in the preparation of Gaseous Exchange of First Year Biology for the students of the intermediate and these are according to the paper patterns of all Punjab boards.
Summary and Contents:
Topics which are discussed in the notes are given below:
- Our comprehensive 1st Year Biology Chapter 13 Notes will ensure you're fully prepared for your exams.
- 1. Only left aortic arch is present in: (a) Crow (b) Mammals (c) Cockroach (d) Birds
- 2. The volume of air taken inside the lungs and expelled during exercise is about … liters. (a) 3.5 (b) 2.5 (c) 1.5 (d) 4.5
- 3. During breathing no state of air remains in the lungs of: (a) Birds (b) Mammals (c) Amphibian (d) Reptiles
- 4. Which is correct order of parts of air passage ways in man:
(a) Nasal cavity , Nostrils , Pharynx , Larynx (b) Nasal cavity , Pharynx , Nostrils , Larynx
(c) Nostrils , Nasal cavity , Pharynx , Larynx (d) Nostrils , Pharynx , Larynx , Nasal cavity
- 5. Blood is not involved in transport of gas in: (a) Man (b) Insects (c) Frog (d) Fish
- 6. Tiny thin walled ducts called parabronchi are present in the lungs of: (a) Reptiles (b) Amphibians (c) Mammals (d) Birds
- 7. Lungs of birds have thin walled ducts called: (a) Bronchi (b) Parabronchi (c) Trachea (d) Alveoli
- 8. Syrin is organ of voice in: (a) Birds (b) Mammals (c) Reptiles (d) Amphilbian
- 9: Parabronchii are present in: (a) Mammals (b) Reptiles (c) Birds (d) Fishes
- 10. In earthworm exchange of gases mainly takes place through: (a) Ostia (b) Lungs (c) Skin (d) Gills
- 11. …have most efficient respiratory system. (a) Mammals (b) Birds (c) Amphibians (d) Fish
- 12. The left systemic arch disappears in: (a) Fishes (b) Reptiles (c) Birds (d) Amphibians
- 13. The number of air sacs in most birds are: (a) 08 (b) 09 (c) 07 (d) 06
- 14. Respiratory organs in fish are: (a) Fins (b) Skin (c) Gills (d) Lungs
- 15. The amount of Carbon dioxide present in air is about: (a) 0.01 to 0.02 % (b) 0.04 to 4 % (c) 0.03 to 0.04 % (d) 0.05 to 0.07 %
- 16. Which one is an insect? (a) Hag fish (b) Cuttle fish (c) Silver fish (d) Star fish
- Q1: Haemoglobin is a complex molecule which contains 9512 atoms and ……….. amino acids.
- Q2: There are about ……….. stomata per square centimeter of leaf surface of tobacco plant.
- Q3: When the smaller bronchi attain the diameter of_............ mm or less they are called
bronchioles
- define photo respiration.
Ans: Respiratory activity which occurs in plants during daytime is called photorespiration.
Photorespiraiton is a light dependent process during which oxygen is absorbed and
carbon dioxide is released. This oxygen is derived from the early reaction of
photosynthesis. The pathway in which RuBP (Ribulose Biphosphala) is converted into
serine is called photorespiration.
- How much CO2 is present in venous and arterial blood?
Ans: Arterial blood contains 50 ml of carbon dioxide per 100 ml of blood whereas venous
blood has 54 ml of carbon dioxide per 100 ml of blood.
- How the rate of carbon dioxide fixation is lowered?
Ans: The photorespiration is a process in which ribulose biphosphala carboxylas/ oxygenase
fixes oxygen instead of carbon dioxide which results in lowering the overall rate of
carbon dioxide fixation and plant growth.
- differentiate between inspiration and expiration.
Ans: Inspiration:
Inspiration is the intake of air inside the lungs.
During inspiration the space inside the chest cavity is raised.
Muscles of ribs contract and elevate the rib upwards and forwards.
The muscles of diaphragm contract and become less dome-like.
Pressure from the lungs is removed and they expand and vacuum is created due
to which air rushes inside the lungs.