In winters, when we take our woolen pullover off, a crackling sound is heard. Explain.

Do we feel in winter night warmer when clouds cover the sky ?

Explain the following: (i) Would life be different, if the 'electron was positively charged and the proton was negatively charged? (ii) Does the choice of signs have any bearing on physical and chemical interactions? (iii) When a person chews a winter green life saver in a dark room, a faint flash of blue light is seen froin his mouth. How?

Which of the following statements regarding the ethical argument for conserving biodiversity is incorrect? (a) We owe to millions of plant, animal and microbes species with whom we share this planet (b) Every species has an intrinsic value only when it is of an economic value to us. (c) It is our moral duty to care for the well-being of all species i.e., our biological legacy. (d) All of these