Test: Pollution And Calamities - 1 - Class 5 MCQ

Effects of Cutting Too Many Trees and Clearing Forests:

• Soil erosion: Trees help hold soil together. Without them, soil gets washed away by rain and wind, making land less fertile for farming.
• Animal extinction: Animals lose their homes when forests are destroyed. This can cause them to die or become extinct.
• Global warming: Trees absorb harmful gases like carbon dioxide. Without trees, more of this gas stays in the air, causing the Earth to get hotter.
• Loss of medicinal plants: Many medicines come from plants in forests. If forests are destroyed, we may lose important plants that help cure diseases.

Effects of Noise Pollution:

• Headache: Loud noises can cause headaches, especially if the noise is continuous and bothersome.
• Deafness: Being around very loud sounds for a long time can damage our ears and cause hearing loss.
• Lack of sleep: Noise can make it hard to sleep, causing tiredness and health problems.
• Stress and anxiety: Constant noise can make people feel stressed and anxious.
• Impaired thinking: Too much noise can make it hard to focus, remember things, or solve problems.
• Communication problems: It’s difficult to talk or hear others in a noisy environment, leading to misunderstandings.

Ways to Reduce Pollution (For Harish's Brother):

• Separate waste: Put wet waste (like food scraps) in one bin and dry waste (like paper and plastic) in another bin.
• Recycle: Recycle items like paper, plastic, and glass so they can be used again, reducing waste.
• Composting:Turn food waste into compost, which can help plants grow.
• Use biodegradable products: Use products that break down easily in nature, like biodegradable bags and plates.
• Join community programs: Take part in local programs for recycling and waste management to keep the community clean.
• Teach others: Share eco-friendly ideas with friends and family to help protect the environment.

Polyester is a synthetic material and does not break down easily, so it should be in the "Non-biodegradable" category.

The Richter scale measures how strong an earthquake is. Bigger numbers mean stronger earthquakes.

Without rain, the water level underground goes down because water keeps evaporating, and there isn’t enough to refill it.

• Scarcity of rainfall: Less rain means less water.
• Severe hot days: Heat makes water evaporate faster.
• Dry windy conditions: Wind can dry out the soil, making things worse.

Rainwater harvesting means collecting rainwater and storing it to use later. This helps save water during times of shortage.

Seismologists are scientists who study earthquakes and how they happen.

This is the most likely to represent a city near an unpolluted river. The combination of many plants and animals (indicating biodiversity), low bacterial count (indicating less pollution), and high oxygen level (indicating a healthy aquatic ecosystem) aligns with the conditions of an unpolluted river environment.