The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because aquatic animals breathe from the oxygen dissolved... View Article
Atomic Size is the distance between the centre of an atom i.e from the nucleus to the outermost (valence) shell of that atom. Atomic size is... View Article
(i) Element E is Silicon. It will form only covalent bonds only. The outermost orbit of silicon has 4 electrons and needs 4 more electrons to... View Article
According to the reactivity series, both sodium and magnesium as well as aluminium are more reactive than carbon as these elements are placed... View Article
The V−I graph for a nichrome wire shows a straight line, which means the resistance of the wire remains constant when the current supply is... View Article
(i) During sunrise, the light rays coming from the Sun have to travel a greater distance in the earth’s atmosphere before reaching our eyes. In... View Article
When a narrow beam of monochromatic light passes through: Glass Slab: It deviates from the actual path but the direction of the incident ray and... View Article
It is a transparent glass plate in which both reflecting surfaces are rectangular in shape, and are parallel to each other. In the glass slab,... View Article
The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is... View Article
Pollination refers to the transfer of pollen grains from the anther of a flower to the stigma of the same or a different flower. Pollination is... View Article
In multi-cellular organisms, chemical communication is better than electrical impulses as a means of communication between cells because chemical... View Article
Adrenaline is a hormone released from the adrenal glands and its major action, together with noradrenaline, is to prepare the body for 'fight or... View Article
(i) 5%  solution of KMn04 is prepared by dissolving 5 grams of KMnO4 in 100 ml of water. (ii) Alkaline potassium permanganate is adding oxygen to... View Article
Washing Soda is prepared from sodium carbonate by recrystallization. Washing soda is synthesized through Solvay’s process. Solvay’s process... View Article
Methods that can be used to reduce our intake of pesticides through food to some extent - We can avoid the usage of chemical pesticides.... View Article
b) Tropic level The trophic level is the position an organism occupies in the food chain. The first trophic level known as the base of the... View Article
d) Consumer Humans are top of the food chain because they are usually omnivorous. As they eat (or consume) organisms or products obtained from... View Article
Factors that determine the size of a Population- Rate of Birth (natality) Rate of Death. (mortality) The fluctuations in the population... View Article
Hormonal methods includes pills, skin patches, vaginal rings and shots containing hormones estrogen and progestin or may contain only progestin... View Article
Reckless female foeticide is the abortion of female foetus using illegal methods. It results in abnormal Men: Women ratio. As the women number... View Article