ACADEMIC SESSION SUBJECT: SCIENCE CLASS: VIII WORKSHEET Chapter-18 POLLUTION OF AIR AND WATER

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1 ACADEMIC SESSION SUBJECT: SCIENCE CLASS: VIII WORKSHEET Chapter-18 POLLUTION OF AIR AND WATER Q1. What do CFCs stand for? Name some devices where CFCs are used. Why CFCs are considered as pollutants? Q2. Why is it advised that industries should switch over to cleaner fuels such as CNG and LPG in the Taj Mahal Zone in Agra? Q3. It is said, CO2 contributes to global warming. Explain. Q4.We should plant trees and nurture the ones already present in the neighbourhood. Why? Q5. Explain the traditional way of purifying water to make it fit for drinking. Q6. Name the following- 1. Pollutant which was used in refrigerators and air conditioner. 2. This layer protects us from harmful ultraviolet rays. 3. Produced on incomplete combustion of fuels. 4. It is essential for combustion. 5. Disease which is caused by drinking contaminated water. 6. This chemical protect our crops & is washed into water bodies from the field. 7. Two sources which cause air pollution due to suspended particulate matter. 8. Two gases which are mainly responsible for acid rain. 9. Two water pollutants which are toxic for plants and animals. 10. One element present in exhaust of automobiles. 11. Year When Ganga action plan was launched. 12. Radiation is absorbed by CO Rays which are harmful for us. Q7. The quality of air at various locations is monitored regularly by government and other agencies? In what way can you use these data? Q8. Combustion of fossil fuels generates a lot of air pollution. Can you suggest any two alternative sources of energy which do not cause any pollution? Q9. Explain Greenhouse effect. Q10.What is the full form of SPM? What does it consist of? Q11. Explain Eutrophication and Biological magnification Q12. How can we reduce, reuse and recycle waste water? Q13. Define Pollution, potable water, acid rain Q14. What are the various sources of air pollutants? Q15. What is smog? Why is it harmful? Q16. What is meant by Marble Cancer? Q17. What is greenhouse effect? Name four greenhouse gases. Q18. Why does the increased level of nutrients in the water affect the survival of aquatic organisms?

2 ACADEMIC SESSION SUBJECT: SCIENCE CLASS: VIII REVISION WORKSHEET CHAPTERS: Chapter-9 Reproduction In Animals Chapter-10 Reaching the Age Of Adolescence 1. Fill in the blanks: a) The fusion of a sperm and egg cell leads to the formation of a single cell with a single nucleus is called. b) The female reproductive organ in which the embryo gets embedded is the. c) fertilization is more common among lower animals. d) The ductless glands are also called. e) Sperms are produced in the. f) Fertilization takes place in in human beings.. g) One of the most conspicuous changes that occur during puberty is the sudden increase in. h) The sign of puberty in girls is the onset of. i) After fertilization; the fixes itself on the wall of uterus. j) are produced by the female reproductive organs called ovaries. 2. Mark the statements true (T) or false (F). Correct the false statements. a) In mosquito, the life cycle is as follows: Egg Pupa Larva - Mosquito b) The method of reproduction that involves only one parent is sexual reproduction. c) Each sperm is a single cell. d) Frog and fish reproduce by internal fertilization. e) The fertilized egg is known as zygote. f) A tadpole develops into an adult frog by process of metamorphosis. g) Oviparous organisms give birth to young ones. h) During puberty, the sweat and sebaceous glands become more active. i) Sweat glands, salivary glands release hormones through ducts. j) Pituitary gland produces growth hormone. 3. Tick the correct answers: a) A fertilized egg is called: i) zygote ii) embryo iii) foetus iv) sperm b) Asexual reproduction involves: i) One individual ii) two individuals iii) More than two individuals iv) no individual c) A tadpole develops into an adult frog by the process of: i) Fertilization ii) Metamorphosis

3 iii) Embedding iv) Budding d) Which of the following is related to sexual reproduction? i) Vegetative propagation ii) Multiple fission iii) Fertilization iv) Binary fission e) Internal fertilization occurs: i) In female body ii) outside female body iii) In male body iv) outside male body f) The number of nuclei present in a zygote is: i) One ii) Two iii) None iv) Many g) The process leading to fusion of gametes in plants and animals is called: i) Growth ii) development iii) Fertilization iv) fusion h) In which female reproductive organ does the embryo get embedded? i) Oviduct ii) Uterus iii) Ovaries iv) Vagina i) Choose the odd one out: cockroach, frog, hydra, bird i) frog ii) cockroach iii) hydra iv) bird j) Choose the odd one out: amoeba, frog, hydra, yeast i) Amoeba ii) frog iii) hydra iv) yeast 4. Match the columns A and columns B: I. Match the terms given in column A to the words given in column B- a) puberty i. testosterone b) male hormone ii. growth hormone c) pituitary gland iii. oestrogen d) testes iv. menstruation e) female hormone v. sperm f) dog vi. external fertilization g) frog vii. asexual reproduction h) caterpillar viii. internal fertilization i) budding ix. sexual reproduction j) zygote x. metamorphosis xi. binary fission 5. Very short answers: (1 3 words ) a) Name the stage of embryo when all body parts can be identified. b) Name the method of asexual reproduction in hydra and amoeba. c) Name the organ that produces insulin. d) Name the hormones that impact metamorphosis in butterfly. e) Provide the term used to describe the developing baby from eight weeks after fertilization, till birth. f) The voice cracks in adolescent boys because of enlargement of this gland. g) Name the chemical substances used to regulate metabolism of the body.

4 6. Define: Embryo, foetus,fertilization, secondary sexual characteristics, hormones, puberty 7. Answer in a few sentences : a) How is sex determined in a human baby? b) Describe menstrual cycle. c) Describe the role of insulin. d) What happens in the female body if the ovum is not fertilized by a sperm? e) Differentiate between sexual and asexual reproduction. f) Discuss how a zygote develops into an individual in humans. g) Explain the life cycle of a frog, with the help of a labeled diagram. h) Differentiate between internal and external fertilization. i) How can you prove that binary fission is a mode of asexual reproduction? j) Draw human female reproductive system. k) Explain the role of adrenaline. l) Differentiate between oviparous and viviparous organisms. m) Differentiate between zygote and foetus. n) Explain the role of thyroxine. 8. Hots Questions: a) Can the process of a child changing into an adult be called metamorphosis? b) Frogs and fishes lay hundreds of eggs at a time. However their population is very little as compared to the number of eggs they lay. Why? c) Can a woman with a blocked fallopian tube give birth to a child? Why? d) In many animal species several young ones may be produced together but usually one baby is born in case of human beings. Why?

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Contact us: Class X Chapter 8 How do Organisms Reproduce Science Question 1: What is the importance of DNA copying in reproduction? DNA (Deoxyribonucleic acid) is the genetic material found in the chromosomes, which