Question

In the experimental set-up shown above in diagram (I) atmospheric air is being passed into lime water with a syringe while in diagram (II) air is being exhaled into lime water. The time taken for the lime water to turn milky in both the test tubes is different. Give reason.

Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.

In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :

Draw the structure of a human male reproductive system and label the following in it. (a) Scrotal sac (b) Urethral opening (c) seminal vesicle (d) Vas deferens