Arrange the following statements in correct sequence.
1.Plants manufacture food by a process called photosynthesis.
2.Plants require energy for their growth.
3.Plants take carbon-di-oxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
4.Plants take in oxygen and release carbon-di-oxide just as animals.
5.Such oxygen is available to animals and human beings for breathing.
6.During this process, oxygen is released by plants.

Assertion (A): Photosynthesis balances the oxygen and carbon cycle in nature. Reason (R): Plants play a vital and important role in maintaining balance between oxygen and carbon dioxide. Plants takes CO_(2) from atmosphere in the process of photosy

Study the following statements regarding acid rain and select the incorrect ones. (i) Acid rain refers to the rainfall and other forms of precipitation with a pH of less than 5. (ii) Oxides of sulphur and nitrogen are released from automobile exhausts, industries , power plants, etc. (iii) These oxides of sulphur and nitrogen, may react with water in the air and form sulphuric acid (H_(2)SO_(4)) and nitric acid (HNO_(3)) . (iv) Acid rain has harmful effects on animals and human beings but no characteristic impact on plants.

(a) Match the following {:("1. Big Bang theory","- (a) study of regions and practical use of plants"),("2. Petrifaction","- (b) organisms buried and cause depression"),("3. Archaeopterys","- (c) other name for astrobiology"),("4. Ethnobotany","- (d) preserve hard and soft parts"),("5. Mold","- (e) origin of universe"),("6. Exobiologi","- (f) fossil bird"):} (b) Match the following {:("1. Oparin and haldane"," (a) use and disuse theory"),("2. Ernest Haeckel","- (b) Mutation theory"),("3. Leonardo da vinci","- (c) Father of Indian paleobotany"),("4. Jean Baptiste Lamarck","- (d) Life from chemical reaction"),("5. Darwin","- (e) Father of paleontology"),("6. De vries","- (f) Radioactive carbon"),("7. Birbal sahani","- (g) Ethnobotany"),("8. W.F. Libby","- (h) Origin of species"),("9. J.W. Harshberger","- (i) Biogenetic law"):}