💬 Discord
Login

Respiration in Plants Practice Questions

Class 11 · Biology · 2012 free MCQs with instant results and detailed explanations.

2012
Total
609
Easy
1023
Medium
380
Hard

Start Practicing Respiration in Plants

Take a timed quiz or customize your practice session

Quick Quiz (10 Qs) → Mock Test (25 Qs) ⚙ Customize

Topics in Respiration in Plants

Respiratory Quotient 361
Fermentation 572
Aerobic Respiration 553
Glycolysis 526

Sample Questions from Respiration in Plants

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the primary purpose of glycolysis in cellular respiration?
A. To convert glucose into pyruvate
B. To produce oxygen
C. To synthesize ATP only in mitochondria
D. To store glucose as starch
Show Answer & Explanation
Correct Answer: A
Glycolysis is the process where glucose is broken down into pyruvate, releasing energy that is captured in the form of ATP.
Q2
Easy
What is the primary purpose of glycolysis in cellular respiration?
A. Produce ATP
B. Beak down fatty acids
C. Synthesize glucose
D. Store energy
Show Answer & Explanation
Correct Answer: A
Glycolysis converts glucose into pyruvate, producing ATP as a key energy source.
Q3
Easy
Which molecule is split into two molecules of pyruvate during glycolysis?
A. Glucose
B. Fructose
C. Galactose
D. Ribose
Show Answer & Explanation
Correct Answer: A
Glycolysis begins with the breakdown of one glucose molecule into two pyruvate molecules.
Q4
Medium
Which of the following is the end product of glycolysis?
A. Pyruvate
B. Acetyl-CoA
C. Lactate
D. Glucose
Show Answer & Explanation
Correct Answer: A
Glycolysis breaks down glucose into two molecules of pyruvate, which is the primary product.
Q5
Medium
Which enzyme catalyzes the conversion of glucose to glucose-6-phosphate in glycolysis?
A. Hexokinase
B. Phosphofructokinase
C. Enolase
D. Pyruvate kinase
Show Answer & Explanation
Correct Answer: A
Hexokinase catalyzes the phosphorylation of glucose to glucose-6-phosphate, the first step in glycolysis.
Q6
Medium
In which cellular location does glycolysis occur?
A. Mitochondria
B. Cytoplasm
C. Nucleus
D. Endoplasmic Reticulum
Show Answer & Explanation
Correct Answer: B
Glycolysis occurs in the cytoplasm of the cell, where it breaks down glucose into pyruvate.
Q7
Medium
What is the initial substrate for glycolysis?
A. Fructose
B. Glucose
C. Galactose
D. Sucrose
Show Answer & Explanation
Correct Answer: B
Glycolysis begins with glucose as its substrate, which is subsequently converted into pyruvate.
Q8
Hard
How many ATP molecules are produced net during the glycolytic breakdown of one molecule of glucose?
A. 2
B. 4
C. 6
D. 8
Show Answer & Explanation
Correct Answer: A
Glycolysis produces 4 ATP molecules but uses 2 ATP in the initial steps, resulting in a net gain of 2 ATP.
Q9
Hard
Which of the following compounds is not an energy carrier in the glycolytic pathway?
A. ATP
B. NADH
C. FADH2
D. Acetyl-CoA
Show Answer & Explanation
Correct Answer: D
Acetyl-CoA is a key molecule in the Krebs cycle, not specifically an energy carrier in glycolysis.
Q10
Hard
What is the primary purpose of the energy investment phase in glycolysis?
A. To produce ATP
B. To phosphorylate glucose
C. To generate NADH
D. To cleave glucose
Show Answer & Explanation
Correct Answer: B
The energy investment phase uses ATP to phosphorylate glucose, which is crucial for its subsequent breakdown.

Showing 10 of 2012 questions. Start a quiz to practice all questions with scoring and timer.

Practice All 2012 Questions →

More Biology Chapters

1 The Living World
2228 Qs →
2 Biological Classification
2303 Qs →
3 Plant Kingdom
2178 Qs →
4 Animal Kingdom
2291 Qs →
5 Morphology of Flowering Plants
2153 Qs →
6 Anatomy of Flowering Plants
2242 Qs →
7 Structural Organisation in Animals
2278 Qs →
8 Cell: The Unit of Life
2370 Qs →

Other Class 11 Subjects

📐 Mathematics → ⚡ Physics → ⚗️ Chemistry →

Respiration in Plants — Class 11 Biology Practice Questions Online

This page contains 2012 practice MCQs for the chapter Respiration in Plants in Class 11 Biology. The questions are organized by difficulty — 609 easy, 1023 medium, 380 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.