a) Colour blindness is more common in men than in women Women have the sex chromosomes XX, while men have the chromosomes XY. The gene for normal colour vision is found on the X-chromosome. If a woman has one X-chromosome with the gene and one without it, she will not be colour blind. On the other hand, a man with an Xchromosome that is missing the gene has no 'backup'. He will definitely be colour blind. Colour blind women have both X-chromosomes missing the colour vision gene. This is less probable mathematically than having just one X-chromosome missing the gene.
b) Light coloured clothes are generally worn in summer
c) A person is hurt more when he falls on hard ground than on soft Force of friction is greater on a hard ground as compared to a soft ground. This force of friction becomes the cause of person being hurt and as it is greater on a hard ground hence the person falling on a hard ground is hurt more.
d) Deforestation causes more floods Trees and Forests act as natural barriers in the way of flowing water. When these trees are cut the natural barriers ultimately vanish and more floods are caused