(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Biology

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 appears first on the bread-the mycelia or the spores?

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.

Given alongside is an incomplete table of vitamins, their rich sources and the related deficiency diseases. Fill in the blanks [(i)-(viii)] with only one suitable word for each. 

What are the respiratory substrates? Give two examples.

Where does glycolysis take place in the living cell?

Write True or False against the following statement:

Combustion is a biological process.

Write True or False against the following statement:

Protein is the first choice as a respiratory substrate.

Write True or False against the following statement:

The respiration is faster than combustion.

Moist germinated seeds were placed in a thermos flask A, and germinating seeds, which were boiled and then soaked in 5 percent formalin, were placed in thermos flask B. Thermometers were inserted in the flask and the mouth of each flask plugged with moist cotton wool. The two flasks were fixed upside down as shown in the fig. 10.9. The temperature on both thermometers was noted. After about 48 hours, the temperature in flask A was found to be much higher than that in flask B.

(a) State the object of using the apparatus.

(b) Explain, why a rise in temperature occurs in flask A.

(c) If 5 percent formalin was not used after boiling the seeds, the temperature of flask B would have risen considerably. Explain.

What is classification of living organism?

How is the classification of living organisms important?

Explain briefly:
Yeast is used in bakeries and breweries.

Write short notes on:
Economic importance of yeast

Give two examples of bryophyta

Give two examples of pteridophyta

Give the name of the
fungus that gives penicillin