Secondary School (English Medium) (5 to 8) इयत्ता ७ - CBSE Question Bank Solutions for Science

Which one of the following is not responsible for water shortage?

Why should oils and fats be not released in the drain? Explain.

The roots of a plant take up oxygen from the ______ trapped between the ______ particles.

Which gas present in the air is essential for aerobic respiration?

Observe the figure carefully and answer the following questions.

1. In which jar, will the amount of CO₂ be the highest and why?
2. In which jar, will the amount of CO₂ be the lowest and why?

A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.

Why did the dough rise?

A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.

Why did the dough smell sour?

A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.

Why was sugar added to the dough?

A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too.

What would have happened if the dough was kept in the refrigerator, soon after it was prepared?

Which of the following are not the liquid forms of water?

1. Snow
2. Lake water
3. River water
4. Water vapour
5. Ice

Choose the correct combination from the options below.

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of

Water cycle does not involve which of the following?

Which of the following inhibits the seepage of rainwater into ground?

State whether the following statement is True or False. If false, write the correct statement

Water vapour is the gaseous form of water

Some definitions are given below which can be corrected by changing one word. Correct them.

1. Aquifer is ground water stored between layers of hard rock above the water table.
2. The process of evaporation of water in the ground is called infiltration.
3. The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

Fill in the blanks in the given passage.

The rainwater and ______ from other sources such as rivers and ponds seeps through the ______ and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called ______.

Place the following statements in a proper order to form a meaningful paragraph.

1. Which in turn decreases the seepage of rain water into the ground.
2. This decreases the open areas like parks and playgrounds.
3. Increasing population create demand for construction of houses, shops, offices, roads and pavements.
4. This results in depletion of water table and creates scarcity of more water.

Paheli wrote a food chain in the following way:

frog → eagle → insects → grass → snake

The chain is not in the correct order. Help her to write the food chain correctly.

Clothes of ______ colours absorb more heat better than clothes of light colours.

Match the following: