Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Respiration in Plants — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
The energy currency of the cell is:
- A.DNA
- B.ATP
- C.Glucose
- D.Oxygen
2.
The aerobic respiration equation is essentially the reverse of:
- A.Transpiration
- B.Photosynthesis
- C.Osmosis
- D.Fermentation
3.
Glycolysis takes place in the:
- A.Mitochondria
- B.Cytoplasm
- C.Nucleus
- D.Chloroplast
4.
Glycolysis splits one glucose into two molecules of:
- A.Lactic acid
- B.Pyruvic acid
- C.Ethanol
- D.Acetyl-CoA
5.
Does glycolysis require oxygen?
- A.Yes, always
- B.No, it is anaerobic
- C.Only in plants
- D.Only at night
6.
Aerobic respiration occurs mainly in the:
- A.Cytoplasm
- B.Mitochondria
- C.Nucleus
- D.Vacuole
7.
The Krebs cycle is also known as the:
- A.Calvin cycle
- B.Citric acid cycle
- C.Nitrogen cycle
- D.Cell cycle
8.
In the electron transport chain, the final electron acceptor is:
- A.Carbon dioxide
- B.Oxygen
- C.Water
- D.Glucose
9.
Aerobic respiration of one glucose yields about:
- A.2 ATP
- B.4 ATP
- C.36-38 ATP
- D.100 ATP
10.
Fermentation takes place when:
- A.Oxygen is plentiful
- B.Oxygen is absent
- C.Light is present
- D.Water is absent
11.
In yeast, anaerobic respiration produces ethanol and:
- A.Lactic acid
- B.Carbon dioxide
- C.Oxygen
- D.Glucose
12.
In tired muscle cells without enough oxygen, pyruvate is converted to:
- A.Ethanol
- B.Lactic acid
- C.Glucose
- D.Starch
13.
The ratio of CO₂ released to O₂ used is the:
- A.Respiratory quotient
- B.Water potential
- C.Turgor pressure
- D.Photoperiod
14.
The RQ for carbohydrates is:
- A.0.7
- B.0.9
- C.1
- D.0
15.
A respiratory pathway that both breaks down and builds up molecules is:
- A.Catabolic only
- B.Anabolic only
- C.Amphibolic
- D.Inert
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
Glycolysis is considered the most ancient, universal pathway because it:
- A.Occurs in all organisms and needs no oxygen
- B.Needs sunlight
- C.Occurs only in mitochondria
- D.Requires chlorophyll
17.
A seed respiring fat as its fuel will have an RQ of:
- A.Less than 1 (about 0.7)
- B.Exactly 1
- C.Greater than 2
- D.Infinity
18.
During vigorous exercise, muscles switch to lactic-acid fermentation chiefly because:
- A.Oxygen supply cannot keep up with demand
- B.There is too much oxygen
- C.Glucose is absent
- D.Mitochondria disappear
19.
Aerobic respiration yields far more ATP than fermentation because in aerobic respiration glucose is:
- A.Completely oxidised to CO₂ and water
- B.Only partly broken down
- C.Not broken down at all
- D.Turned into starch
20.
Krebs-cycle intermediates can be withdrawn to make amino acids. This shows respiration is:
- A.Amphibolic
- B.Purely catabolic
- C.Purely anabolic
- D.Independent of metabolism
21.
An RQ of infinity (or very high) indicates that respiration is:
- A.Anaerobic (no oxygen consumed)
- B.Aerobic with carbohydrate
- C.Aerobic with fat
- D.Not happening
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) ATP
- (B) Photosynthesis
- (B) Cytoplasm
- (B) Pyruvic acid
- (B) No, it is anaerobic
- (B) Mitochondria
- (B) Citric acid cycle
- (B) Oxygen
- (C) 36-38 ATP
- (B) Oxygen is absent
- (B) Carbon dioxide
- (B) Lactic acid
- (A) Respiratory quotient
- (C) 1
- (C) Amphibolic
Section B — Challenge / Olympiad (2 marks each)
- (A) Occurs in all organisms and needs no oxygen
- (A) Less than 1 (about 0.7)
- (A) Oxygen supply cannot keep up with demand
- (A) Completely oxidised to CO₂ and water
- (A) Amphibolic
- (A) Anaerobic (no oxygen consumed)
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