Electricity: Circuits and their Components — Science STD 7 — Question

At a camp site there are tents of two shades-one made with black fabric and the other with white fabric. Which one will you prefer for resting on a hot summer afternoon? Give reason for your choice. Would you like to prefer the same tent during winter?

Write two common adaptive features of a polar bear which help in keeping it warm.

Unscramble the underlined word in the following sentences :
(i) The discharge of blood in adolescent girls which generally occurs every 28-30 days is nstmnoiaretu.
(ii) The hoarseness in the voice of adolescent boys is due to enlarged iceov xob.
(iii) Secondary sexual characteristics are natural signs that the body is preparing for adulthood and mark the onset of urtvpeb.
(iv) We should say NO to lahoclo and srugd as they are addictive.

What causes the seasons on Earth?

Look at the given reaction, Hydrochloric acid + Sodium hydroxide (base) → Sodium chloride (salt) + Water; Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from this solution? Suggest a method (if any).

You were blindfolded and asked to identify the drinks provided in two different glasses. You could identify drink A as lime juice and B as bitter gourd juice. How could you do it inspite of being blindfolded?

How does a fern reproduce?

Distinguish between a parasite and a saprotroph.

The image formed by a lens is always virtual, erect and smaller in size for an object kept at different positions in front of it. Identify the nature of the lens.

What is the difference between breathing and respiration?