Chapter No.7 Bioenergetics best solved MCQs

 21. The raw materials in photosynthesis are

(a) Water, Oxygen

(b) CO2, O2

(c) Water, CO2✅

(d) Glucose, Water

22. The water from the soil enters into the root hairs by the process of

(a) Photosynthesis

(b) Osmosis✅

(c) Diffusion

(d) Respiration

23. The air enters the leaf through

(a) Pits

(b) Stomata✅

(c) Mesophyll

(d) Xylem vessels

24. The light reactions of photosynthesis take place on the__________ of chloroplasts.

(a) Stroma

(b) Thylakoid membrane✅

(c) Lumen

(d) Sacs

25. The reactions which do not require light during photosynthesis are called reactions.

(a) Chemical

(b) Redox

(c) Dark✅

(d) Light

26. Electrons are passed to ETC to produce:

(a) AMP

(b) ATP✅

(c) ADP

(d) NAD+

27. The 6-carbon compounds during the dark reactions of photosynthesis split into_____ carbon compound.

(a) 5

(b) 3✅

(c) 7

(d) 4

28. How many percent of the light falling on the leaf surface is absorbed;

(a) 5%

(b) 6%

(c) 7%

(d) 1%✅

29. Exchange of water vapours and gases occurs in leaf through:

(a) Stomata✅

(b) Epidermis

(c) Xylem

(d) Phloem

30. Any environmental factor, the absence or deficiency of which can decrease rate of a metabolic relations known as;

(a) Unlimited factor

(d) Limiting factor✅

(c) Both

(d) None

31. Vessels, which transport water and salts to the plant are the components of:-

(a) Xylem✅

(b) Phloem

(c) Vascular tissues

(d) All

32. Photosynthesis takes place in:

(a) Chloroplasts✅

(b) Cytoplasm

(c) mitochondria

(d) All

33. Final products of anaerobic respiration is:

(a) Lactic acid

(b) Ethanol

(c) CO2

(d) All✅

34. Glycolysis occurs in:

(a) Cytoplasm✅

(b) Stroma

(c) Nucleus

(d) All

35. Fungi Aspergillus is used for making:

(a) Yogurt

(b) Cheese

(c) Soy Sauce✅

(d) Baking

36. Pyruvic acid is a Carbon compound.

(a) 5

(b) 4

(c) 3✅

(d) 2

37. In which of the following metabolic process, oxidation as well as reduction of molecules occur?

(a) Photosynthesis

(b) Respiration

(c) Both✅

(d) None of these

38. Chlorophyllous pigment absorbs maximum light in wavelengths of:

(a) Green and blue

(b) Green and red

(b) Green only

(d) Red and blue✅

39. ATP was discovered by:

(a) Schwann

(b) J.Purkinji

(c) Darwin

(d) Karl Lohmann✅

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Chapter No.7 Bioenergetics solved MCQs

1. In which of the following steps of respiration, CO₂ is produced?

(a) Glycolysis

(b) Krebs cycle✅

(c) electron transport

(d) All of these

2. Oxygen takes part in aerobic respiration in

(a) Glycolysis

(b) link step between Glycolysis and krebs cycle

(c) Krebs cycle✅

(d) electron transport chain

3. When a plant was kept in darkness for many days, its leaves turned yellow. Why?

(a) Leaves could not get oxygen and so there was no photosynthesis

(b) Leaves could not get light and so there was no respiration

(c) Leaves could not get oxygen and so there was no respiration

(d) Leaves could not get light and so there was no photosynthesis.✅

4. From which bonds of ATP molecule, energy is taken?

(a) P-P bonds✅

(b) C-H bonds

(c) C-N bonds

(d) C-O bonds

5. In which component of the leaf cells, chlorophyll is present?

(a) stroma

(b) Thylakoids✅

(c) Plasma membrane

(d) Cytoplasm

6. Which of these can enter into krebs cycle?

(a) Glucose

(b) Pyruvic acid

(c) citric acid

(d) Acetyl CoA✅

7. When we work hard we suffer from muscle fatigue because muscle cells

(a) Carry out aerobic respiration at faster rate and so are tired

(b) Carry out anaerobic respiration and so accumulate more CO2

(c) Carry out anaerobic respiration and so accumulate lactic acid✅

(d) Carry out aerobic respiration at faster rate and so accumulate lactic acid

8. How many molecules of CO2 are produced when krebs cycle operates once?

(a) 01

(b) 02✅

(c) 03

(d) 06

9. The potential energy is stored in chemical bonds and is released as_________ energy when these bonds break.

(a) Heat

(b) Light

(c) Kinetic✅

(d) Solar

10. Fungi and ________ bacteria get the prepared food.

(a) Motile

(b) Non-motile

(c) Photosynthetic

(d) Non-photosynthetic✅

11._________ reactions are the direct source of energy.

(a) Oxidation✅

(b) Redox

(c) Reduction

(d) None

12. Redox reactions involve exchange of _____________.

(a) Electrons✅

(b) Protons

(c) Neutrons

(d) Atoms

13. In living organisms, redox reactions involve the loss and gain of atom.

(a) Oxygen

(b) Carbon

(c) Nitrogen

(d) Hydrogen✅

14. The major energy currency of all cells is:

(a) ADP

(b) ATP✅

(c) AMP

(d) P-bonds

15. Ribose is a carbon sugar.

(a) Two

(b) Three

(c) five✅

(b) ten

16. There are P-bonds in an ATP molecule.

(a) Two✅

(b) Nine

(c) Six

(d) four

17. The breaking of one phosphate bond releases kcal/mole of ATP.

(a) 7.9

(b) 7.5

(c) 7.1

(d) 7.3✅

18. Photosynthesis is a /an process.

(a) Metabolic

(b) Catabolic

(c) Anabolic✅

(d) Chemical

19.____________ is an inorganic compound of carbon which have poor energy value.  

(a) Glucose

(b) CO2✅

(c) ATP

(d) NADPH

20.___________is a co-enzyme.

(a) NAD+✅

(b) NADH

(c) AMP

(d) None

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