HOW DO ORGANISM REPRODUCE CLASS 10

HOW DO ORGANISM REPRODUCE

 CLASS 10

1. Bread mould will grow quickly on a moist piece of bread or a dry piece of bread? Explain your answer.

2. How does binary fission differ from multiple fission?

3. Name the unicellular and multi cellular organisms which reproduce by budding?

4. What is the importance of DNA copying in reproduction?

5. What is the importance of variation?
6. Name the different methods of asexual reproduction in the organism.
a. Paramecium and kala azar
b. Moss and ferns plants.
c. Bacteria and plasmodium.
d. spirogyra.

REPRODUCTION IN ANIMALS CLASS 8

CLASS 8

REPRODUCTION IN ANIMALS

Q1. Answer the following :

i. Female Gamete in humans.

ii.Organism with largest egg.

iii.Part where development of the baby takes place.

iv.Name the first successfully cloned sheep.

v.Type of fertilization in hens.

vi.Example of viviparous organism.

vii.Example of an organism with internal fertilization and external growth of baby.

viii.Example of an organism with external fertilization –

Q2. Fill ups:

i. In humans __________ is the male reproductive organ and

 _____________ is the female reproductive organ.

ii. _____________ is the male gamete produced by _____________.

iii. Fertilized egg is also called _____________.

iv. The female reproductive organs include______________, ________________ and _____________.

v. The male reproductive organs include _______________, _____________ and _________________.

vi. ______________ and ___________ lays hundreds of 

eggs at a time.

vii. _____________ reproduces by budding.

viii. All living organisms ______________ to produce young 

ones like them.

ix. Organisms reproduce by two ways ______________ and _________________.

x. Tadpole is the developing stage of the _____________.

xi. The cell formed after fertilization is called _________________.

xii. Frogs undergo ____________________ to become 

adults from tadpoles.

xiii. ___________________________ is essential for the continuation of species.

xiv. ___________________________ reproduction is 

characterised by the fusion of two cells called gametes.

xv. The cells involved in sexual reproduction are called _______________.

3. Name the following :

1. Fusion of male and female cell

2. Male reproductive cell

3. Female reproductive cell

4. Cell formed by fusion of male and female gamete

5. Connection between Embryo and Uterine wall

6. A sack protecting the embryo

7. Hormone produced by testis

8. Hormone produced by Ovary which is responsible for 

secondary sexual characters

4. Give reasons for the following:- 

(a) Gender of the resulting offspring is determined by the

 male parent in humans. 

(b) Sex hormones regulate secondary sexual characters. 

(c) Platypus & Echidna lay eggs but are not oviparous animals. 

MAGNETS AND THEIR EFFECTS CLASS 6

FUN WITH MAGNETS

Question 1
State True or False
(a) Magnetism of a magnet is lost by hammering and heating
(b) Magnetite is a natural magnet
(c) A cylindrical magnet has only one pole
(d) Poles always exists in pair
(e) Like poles repel each other
(f) Opposite poles of a magnet attract each other
g) Wood is a non-magnetic Material
h) Plastic is a magnetic Material
i) If a bar magnet is cut into four pieces along its length, then 4 N and 4 S will be formed
Question 2:
Fill in the blanks
1) _________is a device used by pilots and navigators used to find the direction
2) Nickel is a ________ Material
3) Magnets are named after _______________
4) silver is a _____________ Material
5) _______________ is the surest test of Magnetism
6) ____________ type of magnet is used in cranes to lift heavy containers from ships.

3. Name the following :-

1. Name the substances from which artificial magnets are made.

2. Name two poles of a magnet.

3. Name the method to magnetize a piece of iron.

4. Define :-

(1) Magnetic compass

5. Distinguish between

(1) Magnetic & non magnetic substances

(2) Natural & artificial magnet.

6. Answer the following:

        i. A natural magnet.

       ii. Any one pole of a magnet.

       iii. A magnetic material.

       iv. A non magnetic material.

        v. A device used by sailors to find out directions –

       vi. Any one shape of an artificial magnet.

      vii. Place where natural magnets were discovered.

     viii.Total number of poles in a cylindrical magnet.

      ix. Magnet that retain magnetism for short period of time

7. Few iron nails and screws got mixed with the wooden shavings while a carpenter was working with them. How can you help him in getting the nails and screws back from the scrap without wasting his time in searching with his hands?

class 8 sound worksheet

Lesson 13- Sound

 I. Fill in the blanks. 
1. To and fro or back and forth motion of an object is called ___________. 
2. In humans the sound is produced by the ________ or the ___________. 
3. ________ are stretched across the voice box or larynx. 
4. The vocal cords in men are about ______ mm long. 
5. Noise becomes physically painful at _____ dB. 
6. Frequency determines the ________ of a sound. 
7. ________ on the roadside and elsewhere can reduce noise pollution. 
8. _________ and _______ are two important properties of sound. 9. ________ senses the vibrations of sound. 

10. Time taken by an object to complete one oscillation is called _______________.

11. Loudness is determined by the _______________________of vibration.

12. The unit of frequency is ________________________.

13. Unwanted sound is called ______________________.

14. Shrillness of a sound is determined by the __________________________.

15. The number of oscillation in one second is called ____________________.

16. The hearing range of human ear is _____________

17. Sound cannot travel in __________________.

18. Sound can travel in _____________________.

19. The pitch of sound depends on __________________.

II. Name the following 
1. An instrument used for investigating and tracking many medical problems. 
2. Name the major causes of noise pollution. 
3. Name the sources in home which may lead to noise. 
4. Give examples of objects which produce sounds of low frequency or low pitched.
 5. Give examples of objects which produce sound of high frequency or high pitched.

III.choose the correct answer :

1. Ear drum is a part of ____________________ [ sound producing organ or hearing organ]

2. The voice box is also called _________________ [ Larynx / mouth]

3. Large amplitude of sound vibrations will produce __________________________ [ Loud sound / slow sound]

4. Voice of which of following is likely to have minimum frequency _____________________________ [ Baby girl / A woman]

5. The unit of loudness is ________________ ( decibel / Hertz)

IV.Answer the following :

1. Name the sound producing organ in human.

2. How does sound travel from one place to another ?

3. How is sound produced ?

4. What do you mean by musical sound ?

5. How does the amplitude affect the loudness of vibration? 
6. The sound from a mosquito is produced when it vibrates its wing at an average rate of 500 vibrations per second. What is its time period?

class 10 worksheet on control and coordination

Control and coordination

1. What is the stimulus in:

a) Phototropism

b) Geotropism

c) Chemotropism

d) Hydrotropism

e) Thigmotropism

2.Which plant hormone is responsible for the wilting and falling of leaves?

3. Differentiate between gigantism & dwarfism

4. Name one hormone secreted by:

a) Testis

b) Pancreas

c) Thyroid

d) Ovary

5. What is meant by receptors and effectors ?

6. How does our body maintain blood sugar level?

7. Name the hormone synthesized at the shoot tips. How does it help the plant to respond to light?

8. a) Name the hormone which is injected to a diabetic person?

 b) Why should we use iodised salt in our diet?

 c) If iodine is insufficient in one’s diet, what might be the deficiency disease and its symptoms?

9.Identify the glands and mention hormones produced .

a. .Gland which prepares our body to function at maximum          efficiency during anger or danger.
b. Gland that helps in growth of bones and muscles.
c.  Gland that helps in growth of secondary sexual               characters  in males.

class 9 worksheet on improvement in food resources.

IMPROVEMENT IN FOOD RESOURCES.

1.Define hybridization and its types.

2. Enumerate two differences between mixed cropping and intercropping.

3.Give two advantages of using manure over fertilizer.

4.State any four factors for which crop variety improvement is done.

5.Define the term photoperiod. State its significance.

6. Plants get carbon, oxygen and hydrogen from_____________________ and ____________________.

7.Fill in the blanks :

 (a) Kharif crops are cultivated from _________________________to __________________________.

 (b) Rabi crops are cultivated from _____________________to______________________________. 

(c) Paddy, maize, green gram, soyabean, cotton, pigeon pea, ground nut and black gram are ________________crops. 

(d) Wheat, gram, pea, mustard, linseed, barley, potato, tomato, cumin, oat and fenugreek are _______________ crops.

e. Soil ........................... plays an important role in plant growth.

f. ........................... available in soil leads to germination of seeds.

g. Water acts as a ........................... for absorption of water.

h. ........................... is the association of fungi with root.

i. ........................... produces ........................... in leguminous plants.

j. Indian soils are usually ........................... in inorganic matter as well as in ...........................

k. Repeated use of sodium nitrate fertilizer increase the ........................... of the soil.

l. The chemical used to destroyed weeds are known as ...........................

m. Rust is a disease of wheat crop caused by ...........................

n. 2,4-D, and MCPA both are example of ...........................

8. Which farming doesn't use chemicals such as fertilisers, herbicides and pesticides?

A) Inorganic farmingB) Organic farmingC) IntercroppingD) None of these

9. How many nutrients are essential to plants?

A) 12B) 16C) 18D) 20

class 7 worksheet on physical and chemical changes

PHYSICAL AND CHANGES.

 1. Classify the following changes as physical or chemical change:

        i. Rusting of iron

        ii. Burning of crackers

        iii Digestion of food

        iv. Melting of ice

        v. Chopping of vegetables

        vi. Respiration

        vii Growing of a seed into a plant

        viii Dissolving sugar in water

Q2) Define rusting. What are the conditions necessary for rusting?

Q3) What is rust? What is its chemical formula?

Q4) Define galvanisation. Why are the iron pipes in our homes galvanized?

Q5) Why does rusting take place faster near the coastal areas?

Q6) Explain two methods by which rusting of iron can be prevented.

 Q7. State True or False –

1. Melting of wax is a chemical change.
2. A physical change involves formation of new products.
3. A chemical change is irreversible.
4. Burning of paper is a chemical change.
5. Chemical change cannot be reversed by simple physical methods

8.   Name the metals involved in making stainless steel.

2    9.Write down the equation representing the process of rusting.

3   10.Identify the following as physical (P) or chemical (C) changes

4.    a. NaCl (Table Salt) dissolves in water. ______

5.   b Milk sours. _____

6.   c. Ag (Silver) tarnishes. ______

7.   d. Salt dissolves in water. _____

8.   e. An apple is cut. ______

9.   f. Wood rots. _____

1    g. Heat changes H2O to steam. ______

1    h. Pancakes cook. _____

1    i. Baking soda reacts to vinger. ______

      j. Grass grows. ____

1    k Fe (Iron) rusts. ______

1    l. A tire is inflated. _____

     m. Alcohol evaporates . ______

1    n. Food spoilage. _____

1    o. Ice melts. ______

       p. Paper towel absorbs water. 

PLANT WORLD

PLANT WORLD

CLASS 6

1. Give 2 examples of each __

a. Harbs .................... , ......................

b. Shrubs .................... , ......................

c. Trees .................... , ......................

2. What are the main difference between a taproot and fibrous root?

 Fill up the blanks

i) The underground part of the plant is called _______________.

ii) The female reproductive part of the plant is _______________.

iii) The part of plant that conduct water and mineral is called __________.

iv) _________ and ___________ are parts of stamen.

v) ________ is the most attractive part of the flower

vi. The design made by the veins in a leaf is called the ______
vii. The process of leafs absorbing Water and carbon dioxide from the air to produce is called _________
viii. Plants having reticulate venation has __________ roots
ix.  The food prepared by leaves is stored as _________
x. mango plant is a ________
xi. ____ and _____ are parts of stamen
xii. The region of attachment of the leaf with the stem is called the _______
xiii.  Water comes out of leaf in form of vapour by a process   called _________

RESPIRATION IN ORGANISMS

RESPIRATION IN ORGANISM

CLASS 7

Q1 Name the following:-

       a) Inside the cells the breaking of food into water and carbon di oxide

       b) Cockroach breathe by these structures

       c) In fishes these are the breathing structures.

       d) The products formed as a result of glucose breakdown

       e) The type of respiration taking place in our muscles.

        f) A large muscular sheet that forms the floor of the chest cavity

Q2 Fill in the blanks:-

       i)I f the food is broken with the help of oxygen , it is called as ------------.

       ii) In earthworm exchange of gases takes place through----------

       iii) A cell is the smallest ------- and ----------- unit.

       iv) during breathing ----------- and ------------ take place alternately.

       v) Leaves have tiny pores called ----------.

Q3 Why do all organisms respire?

Q4 What is the difference between aerobic and anaerobic respiration .Write equations for both.

Q5 Why are yeasts used to make wine and bear?

Q6 Why do we get muscle cramps after heavy exercise?

Q7 Draw and label a neat diagram of human respiratory system.

Q8 What would happen if a potted plant is over watered

Q9. How is respiration different from breathing?

10. Fill in the blanks:

1. Breathing is a part of _________________.

2. Breathing involves the movement of the ___________ and ______________.

3. The food has ____________ which is released during respiration.

4. The accumulation of ___________ causes muscle cramps.

5. Yeast can survive in absence of oxygen, they are called ___________.

6. The taking in of air rich in oxygen into the body is called ____________.

7. _____________is the food which is broken down in respiration to release energy.

11 . Write true or false:

1. Cellular respiration takes place in all the cells of living organisms.

2. All living organisms respire to get energy from food.

3. Our muscle cells do anaerobic respiration only when there is temporary deficiency of oxygen.

4. Breathing involves the movement of the diaphragm and the rib cage.

5. Whales and dolphins have gills for breathing.

6. Gills are projections of the skin.

7. The percentage of carbon dioxide is higher in inhaled air in comparision to exhaled air.

8. We often feel hungry after a physical exercise.

9. Increased physical activity reduces the rate of breathing.

10. Elephants, snakes and birds have lungs for breathing