The Invisible Living World Beyond Our Naked Eye Class 8 Short Question Answer

The Invisible Living World Beyond Our Naked Eye Class 8 Short Question Answer

The Invisible Living World Beyond Our Naked Eye Class 8 Short Question Answer

Question 1.

What is the role of nitrogen-rich fertilizer in wheat farming?

Answer:

Nitrogen-rich fertiliser provides essential nutrients to the wheat crops, promoting healthy growth and increasing yield.

Question 2.

Identify a microorganism that lives in the human gut.

Answer:

Bacteria, such as Escherichia coli (E. coli), live in the human gut and aid in digestion.

Question 3.

Which microorganism is responsible for making bread and cakes soft and fluffy?

Answer:

Yeast, specifically Saccharomyces cerevisiae, is responsible for the leavening process that makes bread and cakes soft and fluffy.

Question 4.

What happens to the sugar solution in flask A when yeast is added?

Answer:

The yeast ferments the sugar, producing carbon dioxide and alcohol, which can cause bubbling and increase the volume of the solution.

Question 5.

How do muscle cells in the stomach contribute to digestion?

Answer:

Muscle cells in the stomach contract and relax, helping to churn food and mix it with digestive juices.

Question 6.

What is Snehal trying to test by comparing the decomposition of waste in pits A and B ?

Answer:

Snehal is testing the effect of mixing organic waste with dried leaves on the decomposition process, as the presence of dried leaves may enhance microbial activity and speed up decomposition.

Question 7.

Why does curd become sour when left out for a day?

Answer:

Curd becomes sour due to the action of bacteria, particularly Lactobacillus, which ferment lactose in the milk and produce lactic acid, resulting in the sour taste.