Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice solid waste management environmental management biology

Which of the following steps are used to treat industrial wastes and reduce pollution?
(i) The recycling and the reusing of the wastes.
(ii) The discharging of the wastes into the sea.
(iii) The treating and neutralising harmful chemicals in the wastes.

  1. Only (i) and (iii)

  2. Only (i) and (ii)

  3. Only (ii) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water pollution is a major threat to the environment. The release of industrial pollutants contributes to water pollution. The recycling and the reusing of the wastes and by treating and neutralising harmful chemicals in the wastes can reduce the pollution.

So, the correct answer is option A.

Multiple choice solid waste management environmental management biology

Industrial waste must be __________.

  1. Reused

  2. Recycled

  3. Coloured

  4. Disposal directly
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Waste generated from industries is called as industrial waste. Most of the industrial waste is recycled. This helps in proper management of waste.

Multiple choice solid waste management environmental management biology

____________ increases soil fertility.

  1. Vermicompost

  2. Calcium chloride
  3. $NaH _2PO _4$

  4. Sodium atrophine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soil fertility can be improved by used fertilizers. Excessive use of chemical fertilizers decreases the soil fertility. Fertilizers like organic manure, vermicompost etc. helps in increasing the soil fertility.

Multiple choice solid waste management environmental management biology

Sand culture is a component of

  1. Soil-less cultivation

  2. Green house effect

  3. Photorespiration

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydroponics is the method of growing plants without soil. The gravel or sand is used in soilless culture system to provide plant support and retain mineral nutrient and water. 
Thus, the correct answer is option (A). 

Multiple choice solid waste management environmental management biology

The most convenient reusable wastes are

  1. Old newspapers

  2. Broken glass

  3. Flyash

  4. Medical instruments
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The most convenient reusable wastes are old newspapers because you can get them anywhere and they are not a hazard to the environment. So, the correct answer is "Old newspapers".

Multiple choice solid waste management environmental management biology

Flyash is the gaseous waste of cement industry

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cement manufacturing mainly solid waste include clinker production and spoil rocks, which are removed from the raw materials during the raw meal preparation. Kiln dust and fly ash from power plant also included in solid waste. Another waste is generated from plant maintenance like used oil and metal scrap. So, the correct answer is "True".

Multiple choice solid waste management environmental management biology

Some of the electronic wastes may contain valuable metals such as gold and copper

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The old, dilapidated mobile phone you replaced with a snazzy, up-to-date version was disposed of properly at the company’s collection centre. You think it has been discarded in an environmentally friendly way. But often that does not happen. Worse, it can contribute to the losses the country makes on account of electronic waste, or e-waste. Mobile phones have precious metals such as gold, silver and palladium; special metals such as cobalt, indium and antimony; and metals such as copper and tin. So, the correct answer is "True".

Multiple choice solid waste management environmental management biology

Which of the following cannot be added in a composting pit to prepare compost?

  1. Fruit and vegetable peels and paper cups

  2. Earthworms and redworms

  3. Pea plants, dried leaves and sunflower plants

  4. Flowers of plastic and a glass vase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When garbage such as leftover food, fruit and vegetable peels, paper and animals waste is collected in heaps, decomposers such as bacteria, insects such as earthworms and fungi act on it and break it down as these components are organic in nature. This product which is formed by this action of decomposers is called compost. This process is called composting and the compost can be used to increase the plant yield. Thus the correct answer is option A.

Multiple choice solid waste management environmental management biology

What measures should be taken by users to reduce solid waste?

  1. Reuse plastic bag

  2. Reuse boxes

  3. Reuse containers

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Reducing solid waste involves the '3Rs' (Reduce, Reuse, Recycle). Reusing plastic bags, boxes, and containers are all effective ways to minimize the amount of waste generated.