The below image shows a thin lens of focal length 5 m.

(i) What is the kind of lens shown in the above figure?

(ii) If a real inverted image is to be formed by this lens at a distance of 7 m from the optical centre, then show with calculation where should the object be placed?

(iii) Draw a neatly labelled diagram of the image formation mentioned in (ii).

Raina while doing certain reactions observed that heating of substance 'X' with vinegar like smell with a substance 'Y' (which is used as an industrial solvent) in presence of conc. Sulphuric acid on a water bath gives a sweet-smelling liquid 'Z' having molecular formula C₄H₈O₂. When heated with caustic soda (NaOH), 'Z' gives back the sodium salt of and the compound 'Y'. Identify 'X', 'Y', and 'Z'. Illustrate the changes with the help of suitable chemical equations.

Given below are certain situations. Analyze and describe its possible impact on a person:

a) Testes of a male boy are not able to descend into scrotum during his embryonic development.

b) Vas deferens of a man is plugged.

c) Prostate and seminal vesicles are not functional.

d) Egg is not fertilised in a human female.

e) Placenta does not attach to the uterus optimally.

a) A doctor has advised Sameer to reduce sugar intake in his diet and do regular exercise after checking his blood test reports. Which disease do you think Sameer is suffering from? Name the hormone responsible for this disease and the organ producing the hormone.

b) Which hormone is present in the areas of rapid cell division in a plant and which hormone inhibits the growth?