Question
How water gets contaminated?
✓
Answer
Water gets contaminated and scarcity of clean water is due to the following reasons:
- People take baths and wash clothes in rivers and lakes.
- Many people bathe their animals in rivers and lakes.
- Increase in the population, industries and improper disposal of waste.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Explain why holes are made in hanging banners and hoardings.
In the diagram of a bisexual flower given as Figure $12.5,$ draw the missing part and label the parts marked $(a), (b)$ and $(c).$ Also label the missing part that you draw.
→Explain different types of pollination found in flowering plants.
Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction- upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.
Clues:
- The air tubes of insects.
- Skeletal structures surrounding chest cavity.
- Muscular floor of chest cavity.
- Tiny pores on the surface of leaf.
- Small openings on the sides of the body of an insect.
- The respiratory organs of human beings.
- The openings through which we inhale.
- An anaerobic organism.
- An organism with tracheal system.
Explain the differences between self-pollination and cross-pollination.
Complete .the table given below of the contaminant survey.
|
Types of sewage
|
Point of origin
|
Substances which contaminate
|
Any other remark
|
|
Sullage water.
|
Kitchen.
|
|
|
|
Foul waste.
|
Toilets.
|
|
|
|
Trade waste.
|
Industrial and commercial organisations.
|
|
Identify whether the given materials are good or poor conductors of heat.
| Material | Good or Poor conductor of heat |
Discuss the various associated glands of digestive system and their role in digestion.
Write how the following seeds are dispersed?
(I) Seeds with wings
(II) Small and light seeds
(iii) Seeds with spines/hooks
(I) Seeds with wings
(II) Small and light seeds
(iii) Seeds with spines/hooks
Draw a labelled diagram of insect's tracheal system.