Economic Importance of Bacteria Structured Answer Biology Class-9 ICSE Selina Publishers Solutions Chapter-9 Part A. Step By Step ICSE Selina Concise Solutions of Chapter-9 Economic Importance of Bacteria with Exercise-9A including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.
Economic Importance of Bacteria Exe-9A Structured Answer Biology Class-9 ICSE Concise Selina Publishers
| Board | ICSE |
| Publications | Selina Publication |
| Subject | Biology |
| Class | 9th |
| Chapter-9 | Economic Importance of Bacteria and Fungi |
| Book Name | Concise |
| Topics | Solution of E. Structured/Application/Skill Answer Type |
| Academic Session | 2023-2024 |
E. Structured/Application/Skill Answer Type
Economic Importance of Bacteria Class-9 Biology Concise Solutions
Page 95
Question 1.
Draw a diagram showing the Nitrogen cycle and answer the following questions.
(a) Define the terms:
- Nitrification
- Denitrification
(b) Distinguish between biological nitrogen fixation and industrial nitrogen fixation.
(c) Name the kind of relationship that exists between Rhizobium and leguminous plants.
Answer:
(a) Below diagram shows the Nitrogen cycle:
- Nitrification — The conversion of atmospheric nitrogen to nitrates is called nitrification.
- Denitrification — The conversion of nitrates into atmospheric nitrogen is called Denitrification.
(b) Difference between biological nitrogen fixation and industrial nitrogen fixation are:
| S. No. |
Biological Nitrogen Fixation |
Industrial Nitrogen Fixation |
|---|---|---|
| 1. | Biological nitrogen fixation is carried out primarily by bacteria known as nitrogen-fixing bacteria. | Industrial nitrogen fixation involves a series of controlled chemical reactions. |
| 2. | Biological nitrogen fixation occurs in natural ecosystems such as soil, aquatic environments and symbiotic associations with plants. | Industrial nitrogen fixation occurs in controlled industrial settings, such as chemical plants or fertilizer production facilities. |
| 3. | Nitrogen-fixing bacteria possess the enzyme nitrogenase, which converts atmospheric nitrogen (N2) into ammonia (NH3) through a series of biochemical reactions. | The Haber-Bosch process uses high pressure and temperature, along with a catalyst, to convert atmospheric nitrogen (N2) and hydrogen (H2) into ammonia (NH3). |
(c) Symbiotic relationship.
Question 2.
Would there be any bacteria in an aquarium ?
(a) A balanced aquarium contains certain animals as well as some plants. How many kinds of animals can you make out in the aquarium shown here. Name any two such animals.
(b) Do you think there would be some bacteria in it? If so in which part of the aquarium would they be occurring in abundance and what for?
Answer:
(a) Fishes and snails are present in the aquarium shown here.
(b) Yes, aquariums contain bacteria. A balanced aquarium contains some nitrifying bacteria like Nitrosomonas and Nitrobacter which converts the ammoniacal waste released by fish to nitrates. The filter media and various solid surfaces in the aquarium, such as gravel, rocks, plants, and decorations, harbor these bacteria in abundance.
— : End of Economic Importance of Bacteria Part (A) E. Structured Answer Class-9 ICSE Biology Solutions :–
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