Do all cells use oxygen to produce energy ?
Name one substance which is produced in anaerobic respiration by an organism but not in aerobic respiration.
Name one organism which can live without oxygen.
Yeast can live without oxygen.
In which type of respiration, aerobic or anaerobic, more energy is released ?
Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.
Which part of roots is involved in the exchange of respiratory gases ?
Name the process by which plant parts like roots, stems, and leaves get oxygen required for respiration.
Name the pores in a leaf through which respiratory exchange of gases takes place.
Name the areas in a woody stem through which respiratory exchange of gases takes place.
What is the name of the extensions of the epidermal cells of a root which help in respiration ?
Out of photosynthesis and respiration in plants, which process occurs :
(a) all the time ?
(b) only at daytime ?
Name the organs of breathing in fish.
Name an animal which absorbs oxygen through its moist skin.
Name an animal which depends on simple diffusion of gases for breathing.
Name two animals which breathe through gills.
Prawns and mussels.
The trachea divides into two tubes at its lower end. What is the name of these tubes ?
Where does the blood absorb oxygen in the human body ?
Name the red pigment which carries oxygen in blood.
Which gases are exchanged in your lungs ?
Oxygen and carbon dioxide.
Where in the lungs does gas exchange take place ?
What is the name of tiny air-sacs at the end of smallest bronchioles in the lungs ?
What is the other name of wind-pipe ?
What organs are attached to the two bronchi ?
In the lungs :
(a) what substance is taken into the body ?
(b) what substance is removed from the body ?
(b) Carbon dioxide.
State whether the following statements are true or false :
(a) During respiration, the plants take C02 and release 02.
(b) Energy can be produced in cells without oxygen.
(c) Fish and earthworm exchange gases during respiration in the same way.
Fill in the following blanks with suitable words :
(a) The organs of respiration in man are the…………..
(b) The actual exchange of gases takes place in the………… of the lungs.
(c) ………………in the lungs provide a very large surface area for gaseous exchange.
(d) Yeast undergoes……….. respiration whereas Amoeba undergoes………….. respiration.
(e) Gills are the breathing organs in…………..
(d) Anaerobic, aerobic.
Explain why, a land plant may die if its roots remain water logged for a long time.
A land plant may die if its roots remain water logged for a long time because too much water expels all the air from in-between the soil particles. Due to this, oxygen is not available to the roots for aerobic respiration. Under these conditions the roots will respire anaerobically producing alcohol which may kill the plant.
What are the differences between aerobic and anaerobic respiration ? Name some organisms that use anaerobic mode of respiration.
(i) Aerobic respiration takes place in the presence of oxygen.
(ii) Complete breakdown of food occurs in aerobic respiration.
(iii) The end products in aerobic respiratin are carbon dioxide and water.
(iv) Aerobic respiration produces a considerable amount of energy.
(i) Anaerobic respiration takes place in the absence of oxygen.
(ii) Partial break down of food occurs in anaerobic respiration.
(iii) The end products in anaerobic respiration are ethanol and carbon dioxide (in yeast) and lactic and (in animal muscles).
(iv) Much less energy is produced in anaerobic respiration.
(b) Yeast and some bacteria.
Name the final product/products obtained in the anaerobic respiration, if it takes place :
(a) in a plant (like yeast).
(b) in an animal tissue (like muscles).
(a) Ethanol and carbon dioxide.(b) Lactic acid.
What type of respiration takes place in human muscles during vigorous physical exercise ? Give reason for your answer.
Anaerobic respiration takes place in human muscles during vigorous physical exercise because oxygen gets used up faster in the muscle cells than can be supplied by the blood.
Name the type of respiration in which the end products are :
(a) C2H,OH and C02
(b) C02 and H20
(c) Lactic acid
Give one example of each case where such a respiration can occur.
(a) Anaerobic respiration in yeast.
(b) Aerobic respiration in humans.
(c) Anaerobic respiration in muscle tissue of animals.
Define breathing. State the differences between breathing and respiration.
The mechanism by which an organism obtains oxygen from the air and releases carbon dioxide is called breathing.Difference between breathing and respiration:-
(i) Breathing is a simple process.
(ii) Breathing involves taking in oxygen from the air and releasing carbon dioxide into the air.
(iii) Breathing is a physical process.
(i) Respiration is a complex process.
(ii) Respiration includes breathing as well as the oxidation of food in the cells of the organism to release energy.
(iii) Respiration is a bio-chemical process.
What are the different ways in which glucose is oxidised to provide energy in various organisms ? Give one example of each.
There are two ways in which glucose is oxidized to provide energy in various organisms:
(i) Anaerobic respiration ? The respiration which takes place without oxygen is called anaerobic respiration.Example: Yeast and some bacteria break down glucose into ethanol and carbon dioxide.
(ii) Aerobic respiration ? The respiration which uses oxygen is called aerobic respiration.Example: Plants and animals break down glucose completely into carbon dioxide and water to release energy.