Forests: Our Lifeline — Science STD 7 — Question

Fill in the Blank. A _________ near the bulb of a clinical thermometer prevents mercury level from falling of its own.

Fill in the blanks.Haemoglobin is present in ______ cells.

Does the bulb glow when the circuit is open?

State whether the following statements are True or False: A concave lens can be used to produce an enlarged and erect image.

State the use of water in plants.

Fill in the blanks using the words listed below.
water, front, intestinal, salts, pseudopodia, back, vacuole
Tongue is attached at the ___________ to the floor of the mouth cavity and is free at the ___________.

What happens when we wash the haldi stain on our uniform?

State whether the following statements are True or False. In case a statement is false, write the correct statement. Where underground sewerage systems and refuse disposal systems are not available, the high cost on-site sanitation system can be adopted.

List the substances which pollute the soil.

Give the basic unit of speed.