1. The quantitative study of energy conversions and energy relationships in biological systems is called:
Answer: B. bioenergetics
Biology Class 11 Unit 4: Bioenergetics MCQs
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2. Photosynthesis is an energy conversion process in which energy-poor molecules are transformed into energy-rich molecules. The energy-poor molecules are:
Answer: B. carbon dioxide and water
3. In the overall photosynthesis equation, glucose is formed by the:
Answer: B. reduction of carbon dioxide
4. The ultimate source of energy for life on earth is:
Answer: C. sunlight
5. The full range of electromagnetic radiation is called the:
Answer: B. electromagnetic spectrum
6. The visible light range effective for photosynthesis is about:
Answer: B. 400 to 750 nm
7. A graph showing the effectiveness of different wavelengths of light for photosynthesis is the:
Answer: B. action spectrum
8. The most effective wavelengths for photosynthesis in the action spectrum are:
Answer: B. blue (430 nm) and red (670 nm)
9. Air contains about what percentage of carbon dioxide?
Answer: C. 0.03 to 0.04
10. When carbon dioxide concentration rises above 1 percent, the rate of photosynthesis:
Answer: C. slows down rapidly due to stomatal closing
11. Carbon dioxide is utilized in photosynthesis in the:
Answer: B. light independent reaction (Calvin cycle)
12. The splitting of water in the presence of light is called:
Answer: B. photolysis
13. Photolysis of water produces:
Answer: B. 2H plus, 2 electrons and half O2
14. The role of water in photosynthesis was first proposed by:
Answer: C. Van Niel (1931)
15. Van Niel's hypothesis was confirmed in 1940 using an isotope of:
Answer: B. oxygen-18
16. When water labelled with oxygen-18 was given to alga, the evolved oxygen was:
Answer: B. labelled (radioactive)
17. These experiments proved that the oxygen evolved in photosynthesis comes from:
Answer: C. water
18. Photosynthetic pigments in plants are embedded in:
Answer: C. thylakoid membranes
19. The two major groups of pigments in higher plants are:
Answer: B. chlorophylls and carotenoids
20. Chlorophylls absorb mainly:
Answer: B. violet, blue, orange and red
21. Chlorophyll-a is:
Answer: B. bluish green and found in all photosynthetic organisms except bacteria
22. Chlorophyll-b is:
Answer: B. yellowish green
23. The pigment of photosynthetic bacteria is:
Answer: C. bacteriochlorophyll
24. A chlorophyll molecule consists of:
Answer: B. a head and two tails
25. The head of chlorophyll is made up of:
Answer: B. four pyrrole rings around a central magnesium atom
26. The central atom in chlorophyll is:
Answer: C. magnesium
27. The difference between chlorophyll-a and chlorophyll-b is that chlorophyll-a has:
Answer: B. a methyl group (-CH3) on the second pyrrole ring
28. Chlorophyll-b has a:
Answer: B. aldehyde group (-CHO)
29. The head of chlorophyll is:
Answer: B. hydrophilic and light absorbing
30. The tails of chlorophyll are:
Answer: B. hydrophobic and embedded in the thylakoid membrane
31. The side chains in chlorophyll tails are:
Answer: B. phytol and methyl ester
32. Deficiency of chlorophyll in leaves is called:
Answer: B. chlorosis
33. Synthesis of chlorophyll requires sunlight, nitrogen, warm temperature and:
Answer: C. magnesium
34. Carotenoids are:
Answer: B. terpenoid lipids, yellow, orange, red or brown pigments
35. Carotenoids act as:
Answer: B. accessory pigments that protect chlorophyll-a from excess light
36. The two types of carotenoids are:
Answer: B. carotenes and xanthophylls
37. Carotenes are:
Answer: B. orange-red pigments found in all photosynthetic eukaryotes
38. Which pigment is responsible for the yellow colour of foliage in autumn?
Answer: C. Lutein (a xanthophyll)
39. The primary pigment which converts light energy into chemical energy is:
Answer: C. chlorophyll-a
40. Accessory pigments:
Answer: B. absorb light and transfer the energy to chlorophyll-a
41. A graph showing the relative absorption of different wavelengths by a pigment is an:
Answer: B. absorption spectrum
42. Chlorophyll a and b show more absorption in:
Answer: B. violet-blue and orange-red regions
43. An instrument used to determine the absorption spectrum of a pigment is the:
Answer: C. spectrophotometer
44. Clusters of photosynthetic pigment molecules in the thylakoid membrane are called:
Answer: B. photosystems
45. The peripheral part of a photosystem is called the:
Answer: B. antenna complex
46. The antenna complex contains:
Answer: B. accessory pigments such as chlorophyll-b and carotenoids
47. The central part of a photosystem is the:
Answer: A. reaction centre
48. The reaction centre contains only:
Answer: C. chlorophyll-a and associated proteins
49. The reaction centre of photosystem I is:
Answer: B. P700
50. The reaction centre of photosystem II is:
Answer: B. P680
About Biology Class 11 Unit 4 MCQs (Federal Board)
These 222 Biology MCQs cover Class 11 Unit 4: Bioenergetics of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 5 pages of 50. Use the Print button to save this chapter as a PDF.