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Test: Hydroponics: Growing Plants without Soil - Class 8 MCQ


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10 Questions MCQ Test - Test: Hydroponics: Growing Plants without Soil

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Test: Hydroponics: Growing Plants without Soil - Question 1

The word Hydroponics is derived from Greek. What does it mean?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 1

Hydro = water, Ponos = labour or work. Hydroponics means “water work,” referring to growing plants in nutrient-rich water without soil.

Test: Hydroponics: Growing Plants without Soil - Question 2

Which major problem does hydroponics help solve?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 2

Hydroponics is promoted because about 33% of India’s land is degraded. It avoids dependence on soil and helps overcome nutrient loss, deforestation, and over-irrigation issues.

Test: Hydroponics: Growing Plants without Soil - Question 3

Which of the following is NOT a hydroponic method?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 3

Crop rotation is a traditional soil-based farming technique. Wick, DWC, and NFT are the three hydroponic systems explained in the chapter.

Test: Hydroponics: Growing Plants without Soil - Question 4

In the Wick system of hydroponics, water is supplied to plants by:

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 4

In the Wick method, a cotton wick pulls nutrient water upwards to the plant medium using capillary action. It requires no electricity.

Test: Hydroponics: Growing Plants without Soil - Question 5

What is the role of an aerator in Deep Water Culture (DWC)?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 5

In DWC, plant roots are submerged in water. An aerator supplies oxygen, keeping roots healthy (white). Without oxygen, roots turn brown.

Test: Hydroponics: Growing Plants without Soil - Question 6

What is the ideal pH range of water for hydroponics?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 6

Plants grow best when hydroponic water is slightly acidic to neutral, between pH 6.0 and 7.0.

Test: Hydroponics: Growing Plants without Soil - Question 7

Which safe weak acids can be added to reduce pH in hydroponic water?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 7

Weak acids like citric acid and vinegar are safe for adjusting pH. Strong acids (sulfuric, nitric, phosphoric) are unsafe for students.

Test: Hydroponics: Growing Plants without Soil - Question 8

Why is compost tea required in hydroponics?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 8

Since hydroponics does not use soil, compost tea (liquid manure) supplies nutrients and beneficial microbes that normal compost would provide.

Test: Hydroponics: Growing Plants without Soil - Question 9

Which of the following is an advantage of hydroponics?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 9

Hydroponics supports vertical (multistorey) farming in urban areas, producing more crops in less space with efficient water reuse.

Test: Hydroponics: Growing Plants without Soil - Question 10

What does the Nutrient Film Technique (NFT) use for plant growth?

Detailed Solution for Test: Hydroponics: Growing Plants without Soil - Question 10

In NFT, roots are placed in a thin flowing film of nutrient-rich water inside PVC pipes. The flowing water supplies both nutrients and oxygen.

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