Important questions on Biology for science students

27. Explain why, a land plant may die if its roots remain waterlogged for a long time.

28. What are the differences between aerobic and anaerobic respiration? Name some organisms that use anaerobic mode of respiration.

29. 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).

30. What type of respiration takes place in human muscles during vigorous physical exercise? Give reason for your answer.

31. Name the type of respiration in which the end products are:

(a) C₂H₅OH and C0₂

(b) C0₂ and H₂0

(c) Lactic acid

Give one example of each case where such a respiration can occur.

32. Define breathing. State the differences between breathing and respiration.

33. What are the different ways in which glucose is oxidised to provide energy in various organisms? Give one example of each.

34. Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.

35. Explain why, it is dangerous to inhale air containing carbon monoxide.

36. Describe the process of respiration in Amoeba. State whether it is anaerobic respiration or aerobic respiration.

37. State the three common features of all the respiratory organs like skin, gills and lungs.

38. Describe the process of respiration in fish.

39. What would be the consequences of deficiency of haemoglobin in our bodies?

40. Describe the process of respiration in the following parts of a plant:

(a) Root (b) Stem (c) Leaves

41. (a) What is meant by aquatic animals and terrestrial animals?

(b) From where do the aquatic animals and terrestrial animals obtain oxygen for breathing and respiration?

42. Why do fishes die when taken out of water?

43. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

44. Name the energy currency in the living organisms. When and where is it produced?

45. Explain why, plants have low energy needs as compared to animals.

46. Explain how, it would benefit deep sea divers if humans also had gills.

Answers:

31. (a) Anaerobic respiration in yeast (b) Aerobic respiration (c) Anaerobic respiration in muscle tissue of animals 44. ATP 46. The deep sea divers could remain under sea water even without carrying oxygen cylinders for breathing (because they could then extract dissolved oxygen from water for breathing purpose just like fish).