Consider the following statements regarding "Vermi-cakes": 1. They are a byproduct of vermi-processing toilets. 2. They are hazardous waste that must be incinerated. 3. They are a resource needed for soil. Which of the statements given above is/are correct?

The correct option is (c). Explanation Vermi-processing toilets are a form of sustainable sanitation where human excreta is treated using earthworms. This biological process decomposes organic waste into stable, nutrient-rich material. Statement-wise Analysis - Statement 1 is Correct: Vermi-cakes are the end product (byproduct) of the digestion of human excreta by earthworms in vermi-processing toilets. The worms consume the organic matter and convert it into compost. - Statement 2 is Incorrect: Vermi-cakes are not hazardous waste. The vermi-processing method stabilizes the waste and significantly reduces pathogens, making the end product safe to handle. Incineration is not required. - Statement 3 is Correct: Vermi-cakes are rich in nutrients and organic matter. They act as high-quality manure or fertilizer, making them a valuable resource for improving soil fertility. Key Takeaway: Vermi-processing toilets utilize earthworms to convert human waste into safe, nutrient-rich manure (vermi-cakes), thereby recycling waste into a resource for soil.

Consider the following statements regarding "Vermi-cakes": 1. They… - NCERT Class 7 Environment & Ecology MCQ

NCERT Class 7 Environment & Ecology — Chapter 2: Wastewater story

mcqmedium

Consider the following statements regarding "Vermi-cakes":

They are a byproduct of vermi-processing toilets.
They are hazardous waste that must be incinerated.
They are a resource needed for soil.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 7 · Page 162

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

Vermi-processing toilets are a form of sustainable sanitation where human excreta is treated using earthworms. This biological process decomposes organic waste into stable, nutrient-rich material.

Statement-wise Analysis

Statement 1 is Correct: Vermi-cakes are the end product (byproduct) of the digestion of human excreta by earthworms in vermi-processing toilets. The worms consume the organic matter and convert it into compost.
Statement 2 is Incorrect: Vermi-cakes are not hazardous waste. The vermi-processing method stabilizes the waste and significantly reduces pathogens, making the end product safe to handle. Incineration is not required.
Statement 3 is Correct: Vermi-cakes are rich in nutrients and organic matter. They act as high-quality manure or fertilizer, making them a valuable resource for improving soil fertility.

Key Takeaway:
Vermi-processing toilets utilize earthworms to convert human waste into safe, nutrient-rich manure (vermi-cakes), thereby recycling waste into a resource for soil.

Your note

More from Chapter 2: Wastewater story

With reference to the "Grit and Sand Removal Tank", consider the following statements: 1. It is a treatment step that typically follows the bar screens. 2. It relies on the principle of significantly increasing water speed to prevent sand from settling. Which of the statements given above is/are correct?

medium

What is the primary environmental consequence of discharging untreated sewage into river systems?

easy

With reference to the "Swachh Bharat" mission, consider the following statements: 1. It was initiated in the year 2016. 2. It focuses on proper sewage disposal and providing toilets for everyone. 3. It strictly prohibits the use of vermi-processing toilets. Which of the statements given above is/are correct?

easy

Considering low-cost sanitation systems based on biological processing, the principal by-product of vermi-processing toilets is:

medium

Consider the following statements about the "Clarified Water" in a treatment plant: 1. It is the water obtained immediately after passing through bar screens. 2. It is water from which solids have settled and floatable impurities have been skimmed off. 3. It may still contain suspended impurities and requires further treatment. Which of the statements given above is/are correct?

medium

Keep practising Chapter 2: Wastewater story

Work through every question from this NCERT chapter.

Browse all NCERT Class 7 Environment & Ecology chapters