Selina solutions for Concise Biology [English] Class 9 ICSE chapter 9 - Economic Importance of Bacteria and Fungi [Latest edition]

Bacteria are no more classified as plants primarily because:

A particular species of which one of the following, is the source bacterium of the antibiotic, discovered next to penicillin, for the treatment of tuberculosis?

Which bacteria are rod shaped?

Which bacteria fixes nitrogen in the soil?

Name the three common types of bacteria.

Match the items in Column A with those in Column B.

Would you consider the bacteria and yeast as plants? Give reason.

In what form bacteria may be present in the air?

Why is spore formation in bacteria not considered as a form of reproduction?

In what respect do you consider bacteria as simple organisms?

State the differences between decay and putrefaction.

State the differences between pasteurization and sterilization.

Why is it generally advised that every living room in the house should get direct sunlight at least for a short time?

Would there be any bacteria in an aquarium?

Both bacteria and yeast reproduce by asexual method, but how does this method differ in them?

Describe the role of micro-organisms in industrial production.

How do bacteria obtain their nourishment?

Describe any two uses of bacteria in the industry.

What are antibiotics? Give ‘two’ examples

Is tinned and sealed food always safe to eat? Give reasons in support of your answer.

Study the diagram given below and then answer the questions that follow:

Briefly describe how nitrogen of the atmosphere is converted to nitrates by leguminous plants.

Study the diagram given below and then answer the questions that follow:

Name the bacterium that converts

(i) ammonium compounds to nitrites

(ii) nitrites to nitrates

Study the diagram given below and then answer the questions that follow:

State how the nitrates in the soil get converted to nitrogen of the atmosphere.

Study the diagram given below and then answer the questions that follow:

Role of plants and animals in the formation of ammonium compounds.

Production of ethanol (C₂H₅OH) occurs in one of the life processes of: 

Which one of the following characteristics is found in all fungi but not in all bacteria?

Bacteria are referred to as prokaryotes because

Yeast is used in the production of

Tick (✓) mark the correct statement/statements.

(a) All mushrooms are poisonous.

(b) All toadstools are poisonous.

(c) Some toadstools are poisonous.

(d) Some mushrooms are edible. 

Where can you find the mould Rhizopus most easily found?

Why is it generally advised that every living room in the house should get direct sunlight at least for a short time?

Describe the role of certain fungi in industrial production.

Differentiate between: Saprophyte and parasite

Differentiate Between: Aerobic and anaerobic respiration with regard to products

State the differences between decay and putrefaction.

What are antibiotics? Give ‘two’ examples

Is tinned and sealed food always safe to eat? Give reasons in support of your answer.

Would there be any bacteria in an aquarium?

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:

How did the mould get inside the bell-jar?

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:

What would happen if the bread was not covered by the bell-jar?

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation: 

What would happen if moist bread was placed in a refrigerator?

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:

What happens first on the bread-the mycelia or the spores?

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:

How does bread mould obtain nourishment? What type of nourishment is it- epiphytic, autotrophic, parasitic symbiotic, or saprophytic?

Write in proper sequence the five major steps in the cultivation of the common edible mushrooms.

Comment on the following:

Denitrifying bacteria are a blessing as well as a curse to farmers.

Comment on the following: 

Yeast is used in bakeries and breweries.