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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