Plz answer this its really urgent...plz plz

Plz answer this its really urgent...plz plz • Draw. labelloii diagram to show nitrogon cycle in List any four organisms involved in this cycle. 12• Name the type of colloids [n each 01 the following in Which the dispersed phase and the dispersion medium are respectively liquid and liquid, (i) liquid and gas. (iii) liquid and solid. Also, give one example of each, 13. Identify the followingorganisms. (i) Indicatovs of air pollution. (ii) Pmnts with hidden reproduction organs. (iii) Mutually benefitted relationship between two organisms. 14. Earthworm, leech, Ne are classified in one group. What are the important characteristics on the basis of which this grouping is done? 15. (i) What are the characteristics or sound 18. 19. 20. 21. 22. 23. 26. Allinone SCIENCE IAtomie t2u,C, Or What are the majoi Observations made Rutherford in his experimente Also write conclusion drawn from it. O) Stete Newton's third law ot motion give one example to illustrate the law. Give reasons for the following observations (a) When a boy jumps out Of boat, the boat move backwards: lb) The passengers sitting in bus back—wards when bus starts to suddenly. AIDS is a deadly syndrome. Do you agree? yes, give suitable explanation in support of your answer- Give reasons. (j) A liquid flows easily. (ii) Ice at OOC appears colder in the mouül than water at OOC. (jii) Doctors advise to put strips of wet cloth on the forehead of a person having high fever. (iv) We perspire more during summer, (v) A wooden table should be called a solid. 16. waves ? (ii) An echo is returned in 3 s. What is the distance 01 reflecting surface from the source, given that the speed of sound is 342 m/s? (Ans. 513m' How does the wound produced by a vibrating object in a medium reach your ear? (i) Show the distribution of electrons in an atom of element having symbol through a diagram. Also. find out the valency 01 the atom giving suitable reasons. 'Ans. 21 (ii) Find the formula of Compound formed when reacts with an element having electronic configuration as 2, 8, 1. (iii) According to the Dalton's atomic theory, list two observations that suggest atoms are indivisible. (i) Calculate the number of moles in 112g of Iron. (Ans. 2 moll (ii) Calculate the mass of 0.5 mole of sugar (ct2Huo„) (Ans. 171 kgl (iii) Define the term molecular mass. (jv) Determine the molecular mass of Zn SO, {Atomic mass of Zn .32u and —16u} [Ans. 161uJ (v) Calculate the number of molecules of carbon dioxide, C02 present in 4.4g of (i) What is reverberation? How is it reduc«i? (ii) If the velocity of sound in dir is 340 n's. calculate the frequency of wave whose wavelength is 1m. Will it be audible to Mention the shape of chloroplast in Spirogyra. Give one identifying feature of the group to whiéh Spirogyra belongs. On heating mdgnesium ribbon in the presence of air, identify the colour and physical state of the substance produced. 24. An object is dropped from a height h when will it have maximum (i) potential energy (ii) kinetic energy 25. 208.5g of barium chloride solution reacts with sodium sulphate solution and gives 233.5g of barium sulphate and 117g 01 sodium chloride. Calculate mass of the sodium sulphate used. Mention the phylum of the following animals. (i) Earthworm (ii) Cockroach What do you understand by the term adaptation? Give any two adaptations found In cockroaches.