Our Environment

A city experiences unusually heavy rainfall over several days. Which of the following consequences is LEAST likely to occur immediately?

1. Rivers and lakes overflow
2. Air becomes more humid
3. Increase in evaporation
4. Sudden increase in transpiration

Answer: (d) Sudden increase in transpiration

Which combination of materials and design would create the MOST efficient and sustainable rainwater harvesting system on a school rooftop?

1. Sloped tin roof + filter + underground tank + overflow channel
2. Flat concrete roof + bucket + plastic pipe to garden
3. Bamboo roof + open drain + sunlight purifier
4. Solar panels on roof + heater + swimming pool tank

Answer: (a) Sloped tin roof + filter + underground tank + overflow channel

A farmer waters his land but notices plants still look unhealthy. Soil analysis shows no air pockets. Which process is most affected?

1. Photosynthesis
2. Transpiration
3. Root respiration
4. Pollination

Answer: (c) Root respiration

Match Column A with Column B: Column A (Layer) Column B (Function) A Troposphere 1 Weather and temperature changes occur B Stratosphere 2 Meteor showers observed C Mesosphere 3 The ozone layer and increasing temperature D Thermosphere 4 Satellites orbit

1. A-1, B-3, C-2, D-4
2. A-1, B-2, C-4, D-3
3. A-2, B-1, C-3, D-4
4. A-3, B-4, C-2, D-1

Answer: (a) A-1, B-3, C-2, D-4

In a city where untreated sewage is released into a nearby river, which stage of the water cycle is most likely to transmit harmful substances further?

1. Evaporation
2. Precipitation
3. Condensation
4. Surface runoff

Answer: (d) Surface runoff

Choose the correct answer from the clues given. It encourages product redesign It reduces need for landfills It gives economic value to waste It involves sorting waste at source Which waste management strategy matches all the above?

1. Incineration
2. Composting
3. Recycling
4. Sanitary Landfilling

Answer: (c) Recycling

A village wants to prevent health issues caused by flies and foul smell from its waste dump. The dump includes kitchen leftovers, cow dung, and plant twigs. What is the best sustainable solution they can adopt?

1. Burn the waste once a week
2. Cover the dump with soil and leave the land as such
3. Use it to make compost using compost pits
4. Spray insecticides daily on the waste

Answer: (c) Use it to make compost using compost pits

Refer to the Venn diagram showing three pollutants: p: Pollutants that cause respiratory diseases q: Pollutants released by vehicles r: Pollutants that contribute to greenhouse effect Which of the following pollutants most likely belongs to all?

1. Carbon monoxide
2. Nitrogen dioxide
3. Sulphur dioxide
4. Particulate matter

Answer: (b) Nitrogen dioxide

You are organizing a large school festival and expect hundreds of students and parents to attend. To reduce waste, you are asked to suggest the most eco-friendly approach for managing food leftovers and disposable plates. What would be the most appropriate combined solution?

1. Use paper plates and dump all food waste in a landfill
2. Use reusable steel plates and set up a composting bin for leftovers
3. Use plastic plates and collect food waste for recycling
4. Use disposable plastic plates and set up a vermicomposting pit

Answer: (b) Use reusable steel plates and set up a composting bin for leftovers

A school conducted a 3-day Waste Audit during its annual science week. The students collected, classified, and measured the waste generated in different areas of the school. Based on the waste audit table below, which of the following statements shows the most accurate understanding of the waste types, their sources, classification, and appropriate management? Area Observed Waste Types Weight (kg) Suggested Disposal Canteen Fruit peels, plastic straws, leftover food 12 Composting bin Science Lab Broken glass, used paper towels, expired chemicals 5 Separate waste bins Playground Torn shoes, paper wrappers, ice cream sticks 7 Landfill Staff Room Tea bags, aluminum foil, plastic water bottles 6 Recycling station

1. Canteen waste is mostly biodegradable and should be incinerated to reduce its volume.
2. Waste from the science lab should be composted along with canteen waste to save time.
3. Playground waste is primarily non-biodegradable and should be minimized by reuse strategies.
4. Staff room waste cannot be recycled because it comes from a non-commercial source.

Answer: (c) Playground waste is primarily non-biodegradable and should be minimized by reuse strategies.