Question 1

Question 1Describe the different types of respiration that takes place in plants.

Accepted Answer

Depending upon the presence or absence of oxygen, respiration is of two types — aerobic respiration and anaerobic respiration.Aerobic respiration — When the oxidation of food (glucose) takes place in the presence of oxygen, it is called aerobic respiration. In this process, glucose is completely oxidized to form carbon dioxide and water. It takes place in mostly higher animals and plants. In aerobic respiration, 38 ATP molecules are released from oxidation of one glucose molecule.Glucose + Oxygen ⟶ Carbon dioxide + Water + Energy (38 ATP)Anaerobic respiration — When the oxidation of food (glucose) takes place in the absence of oxygen, it is called anaerobic respiration. In this process, glucose is not completely oxidized to form carbon dioxide and water. Rather, it is oxidized to produce ethyl alcohol or lactic acid and 2 ATP molecules.Glucose (in absence of oxygen) ⟶ Carbon dioxide + Ethyl alcohol + Energy (2 ATP)

Question 2

Question 2How does exchange of gases take place through the stomata?

Accepted Answer

Each stoma has two bean-shaped cells called guard cells. The inner walls of the guard cells are thicker than the outer walls. When the guard cells are full of water, they swell and bulge outwards, opening the stomata. When the stomata is open, the exchange of gases takes place by the process of diffusion. Oxygen and water vapour leave the plant through the stomata while carbon dioxide enters through them.When the guard cells lose water, they lose their turgidity closing the stomata. When the stomata is closed, no exchange of gases takes place through it.

Question 3

Question 3How does respiration occur in the stems and roots?

Accepted Answer

The old and mature roots and hard woody stems of certain trees are covered by bark. The bark contains very tiny openings called lenticels. The lenticels enable the oxygen to reach the intercellular spaces of interior tissues and carbon dioxide to be released into the atmosphere. At the base of the lenticels are loosely arranged cells that allow the diffuse gases to pass through them.Respiration also takes place through the roots of plants. Air is present in the spaces between the soil particles. The oxygen in this air is absorbed by root hairs present on the roots. From root hairs, it is supplied to all the parts of the roots. Carbon dioxide released during respiration is diffused out of the roots through the same root hairs.

Question 4

Question 4Write the differences between respiration in plants and animals.

Accepted Answer

Sl.No.Respiration in AnimalsRespiration in Plants.1.Animals take in oxygen through lungs.Plants take in oxygen through stomata, lenticels and the general surface of the roots.2.Carbon dioxide is released as by-product in the process and is not taken back.Carbon dioxide is released as a by-product in the process and is reabsorbed for photosynthesis.3.The food and oxygen used for respiration are taken from outside.The food and oxygen used for respiration are produced by the plants themselves.4.The rate of respiration is very fast.The rate of respiration is slow.

Question 5

Question 5What are pneumatophores?

Accepted Answer

Pneumatophores are the specialized roots of plants growing in salty and marshy area, that grow out of the surface of water. They have many pores on their surface to respire.

Source: This question is from Respiration in Plants, Biology &mdash; Class 7, ICSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Respiration in Plants: Question, Pneumatophores, Respiration in Plants, Biology. These are fundamental topics in Biology that students are expected to master as part of the ICSE Class 7 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your ICSE examinations. These topics are frequently tested in both objective and subjective sections of Biology papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberUse precise scientific terminology as defined in the textbook.
Draw and label diagrams neatly for full marks.
Understand the difference between structure and function.
Learn processes step-by-step in the correct sequence.
Related Questions from Respiration in PlantsQ1: Question 1 Describe the different types of respiration that takes place in plants.
Q2: Question 2 How does exchange of gases take place through the stomata?
Q3: Question 3 How does respiration occur in the stems and roots?
Q4: Question 4 Write the differences between respiration in plants and animals.
Q6: Question 1 ............... is a process that takes place in plants throughout the day. It is of...
Practice more questions from Respiration in Plants &mdash; Biology, Class 7 ICSE

Question 6

Question 1............... is a process that takes place in plants throughout the day. It is of ............... types. They are ............... respiration and ...............respiration. In ............... respiration, complete ............... of glucose takes place in the presence of ............... to release ..............., ............... and ............... ATP molecules. In ............... respiration, incomplete ............... takes place in the ............... of oxygen to release ..............., ............... and ...............ATP molecules.

Accepted Answer

Respiration is a process that takes place in plants throughout the day. It is of two types. They are aerobic respiration and anaerobic respiration. In aerobic respiration, complete oxidation of glucose takes place in the presence of oxygen to release carbon dioxide, water and 38 ATP molecules. In anaerobic respiration, incomplete oxidation takes place in the absence of oxygen to release ethyl alcohol, carbon dioxide and two ATP molecules.

Respiration in Plants

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