HOW DO ORGANISMS REPRODUCE.
                                        Class 10


1,Define reproduction.
2. Why reproduction is considered as important life processes.
3. Name the different types of reproduction?
4. what are the advantages of sexual reproduction.
5. Name the different modes of asexual reproduction. 

                                                                 Class-6  Electricity
    Answer these questions
 1. What is electricity? 
 2. What are the two kinds of charges ?
 3. Describe the construction of Dry cell. Why it is called so?
 4. What is electric circuit? What are its types explain with diagrams.
 5. What is a fused bulb? Why does it not glow when connected?
 6. Why are switch used in circuit? What kind 0f switches are used in homes? How does it works
 7. Explain the reason why
 a. One should not touch a running electrical appliance with wet hands.
 b. An electrical wire with frayed plastic wrapping should be discarded and replaced?
 c. People working with electricity wear rubber gloves?
 d. Silver is not used in wire even it is excellent conductor? 

ELECTRIC CURRENT AND ITS EFFECTS

Q1.Fill in the blanks :

1. A combination of two or more cells is called a _____________ .

2. The working of a an electric bulb, electric iron and the fuse is based on the __________________ effect of current.

3. The filament of an electric bulb is made of ______________ and has ______________ (high/low) melting point.

4. Instead of electric bulbs, it is advisable to use ______________ and __________________ , in order to reduce wastage.

5. __________ is a safety device which prevents fires and damage to electrical Appliances.

6. A current carrying coil wrapped around a piece of iron is called an __________.

7. ________________ performed experiments to prove the magnetic effect of current.

8. _________________ and _____________ are devices which have electromagnets in them.

class 8 worksheet 

 Reaching the Age of Adolscence.

Fill in the blanks :

1.The period of life, when the body undergoes changes, leading to reproductive maturity is called _____________________.

2.The age at which reproductive organs become functionally active is called ____________________________.

3.Increase in height occurs during _______________________.

4.____________________ are external characters which are directly not involved in the process of reproduction.

5.The changes which occur during adolescence are controlled by ________________________________.

6.The hormones are produced in special organ are called __________________________________.

7.Endocrine glands are also called _______________________ glands.

8.In frog metamorphosis is controlled by _____________________ hormone.

Answer the following :

1. Name the sex hormone in humans.

2. Name the disease caused due to deficiency of the hormone thyroxine.

3. Name the hormone produced by the adrenal gland.

4. Name the master gland.

5. What are the type of sex hormones produced by males ?

                             CLASS - IX Science (Natural resources)

                                           WORKSHEET-1

 1. Water vapours changes into water droplets by:-

 (a) condensation (b) evaporation (c) sublimation (d) none [1]

 2. Which of the following is a green house gas?

 (a) CO2 (b) O2 (c) ozone gas (d) both (a) and (b) [1]

 3. Layer of earth where life is possible is called

 (a) biosphere (b) lithosphere (c) hydrosphere (d) none [1]

 4. Main constituent of atmosphere of mars is:- (a) O2 (b) CO2 (c) ozone gas (d) none [1]

 5. What is smog? How is it formed? [1]

 6. Why water is so important in life? [2]

 7. How does living organism help in the erosion of rocks? [2]

 8. How is rain formed? [2]

 9. Discuss the oxygen cycle in atmosphere? [2]

 10. What is the difference between the atmospheres of the earth and atmosphere of Venus and Mars? [3]

 11. What is air pollution? How does it lead to acid rain? [3]

 12. Why is CO2 so important for life on earth? What are the two ways by which it is fixed on earth? [3]

                       CLASS - IX Science (Natural resources)

                                       WORKSHEET-2

 1. Which of the following is present abundantly in air?

 (a) Nitrogen (b) Oxygen (c) CO2 (d) Water [1]

 2. The regions of earth from outside to inside is:-

 (a) Core, mantle, and crust (b) Core, crust, and mantle (c) crust, mental, and core (d) mantle, core, and crust [1]

 3. Which layer is topmost layer from earth’s surface?

 (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Thermosphere [1]

 4. The process by which O2 gets converted to CO2 is:-

 (a) Photosynthesis (b) Breathing (c) Respiration (d) Both (a) and (b) [1]

 5. What is atmosphere? What are its different regions? [1]

 6. What are biogeochemical cycles? [2]

 7. Why is life possible on earth? [2]

 8. Why do terrestrial life forms require fresh water? [2]

 9. How does atmosphere control the climate? [2]

 10. Write in detail what happens when water gets polluted. [3]

 11. Discuss the nitrogen cycle in nature? [3]

 12. What is greenhouse effect? What would happen if the level of CO2 in air would increase? [3]

class 6