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Chapter: 05. Respiration In Plants

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CLASS VII: BIOLOGY

CHAPTER: RESPIRATION IN PLANTS

PRACTICE EXAM PAPER

Time Allowed: 1.5 Hours ​Maximum Marks: 50
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SECTION A: MULTIPLE CHOICE QUESTIONS (5 Marks)

Choose the correct option for each of the following questions:
In aerobic respiration, the complete oxidation of glucose takes place inside which cell organelle? (a) Chloroplast (b) Cytoplasm © Mitochondria (d) Ribosome
What are the end-products of anaerobic respiration in yeast cells? (a) Lactic acid and energy (b) Ethyl alcohol, carbon dioxide, and energy © Carbon dioxide, water, and energy (d) Glucose and oxygen
Why is ATP known as the “energy currency” of the cell? (a) It is used to build cell walls. (b) It is the immediate source of energy for the cell. © It is only produced during the daytime. (d) It acts as a physical barrier for gas exchange.
Which of the following is a physical or mechanical process that does not release energy? (a) Photosynthesis (b) Cellular respiration © Fermentation (d) Breathing
During the daytime, plants do not take in oxygen from the atmosphere for respiration because: (a) They stop respiring during the day. (b) Stomata remain completely closed during the day. © A part of the oxygen produced during photosynthesis is utilized for respiration. (d) They only use carbon dioxide for all life activities.
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SECTION B: FILL IN THE BLANKS (5 Marks)

Fill in the blanks with the most appropriate words. Use the exact text clues where applicable.
The breakdown of glucose in the deficiency of oxygen in muscle cells is called lactic acid _ _ _ _ _ _ _ _ _ _ _ _ _ _.
In old woody stems, _ _ _ _ _ _ _ _ _ _ _ _ _ _ develop below the bark to ensure gaseous exchange.
Photosynthesis is an endergonic process, whereas respiration is an _ _ _ _ _ _ _ _ _ _ _ _ _ _ process because energy is released.
Energy released during the oxidation of food is trapped and stored in the cells as _ _ _ _ _ _ _ _ _ _ _ _ _ _ molecules.
Root hairs extend into the air spaces present between the _ _ _ _ _ _ _ _ _ _ _ _ _ _ particles to take up oxygen.
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SECTION C: TRUE OR FALSE (5 Marks)

State whether the following statements are True or False. If false, rewrite the correct statement.
Anaerobic respiration is completed in the cell cytoplasm, and mitochondria do not take part in it.
Plants carry out photosynthesis only during the day and respiration only at night.
No energy is released during the physical process of breathing.
Yeast yields ethyl alcohol because it respires aerobically.
Transport of gases inside a plant takes place entirely by diffusion.
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SECTION D: EXPLANATION OF TERMS (8 Marks)

Define or explain the following terms in one or two sentences:
Fermentation
Aerobes
Exergonic reaction
Cellular respiration
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SECTION E: DIFFERENTIATE CONCEPTS (6 Marks)

Differentiate between the following pairs based on the criteria in brackets:
Breathing and Cellular Respiration (Based on: Nature of process and Energy release)
Aerobic Respiration and Anaerobic Respiration (Based on: Requirement of oxygen and End-products in plant cells)
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SECTION F: DIAGRAM-BASED QUESTION (6 Marks)

An experimental setup to demonstrate the production of carbon dioxide during respiration in germinating seeds.
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Based on the diagram above, answer the following questions:
What change will you observe in the test tube containing limewater when water is slowly poured into the bottle?
Why are germinating (sprouted) seeds used in this experiment instead of green, leafy plants?
Why is the wide-mouthed bottle wrapped with black paper?
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SECTION G: OBSERVATION-BASED & EVERYDAY USE QUESTIONS (6 Marks)

Answer the following questions based on practical scientific reasoning:
Why are we advised not to sleep under a tree at night? Explain based on the concentration of atmospheric gases.
Yeast is widely used in the commercial production of wine and beer. Explain the biological process behind this application.
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SECTION H: SHORT & LONG ANSWER QUESTIONS (9 Marks)

Write the word equations representing: (a) Aerobic respiration (b) Anaerobic respiration in plants
How do different parts of a plant (leaves, stems, and roots) independently obtain oxygen from their surroundings?
“Photosynthesis and respiration are two opposite processes.” Justify this statement by listing three differences between them.
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