Science Std IV Chapter 7

7. The Digestive System and Teeth

A. Fill in the blanks with correct answers.
1. The digestive process begins in the _______________. (stomach/mouth)
2. From the food pipe, the food comes into the _______________.
    (stomach/small intestine)
3. The waste called ________________ (saliva/faeces) is then expelled out through
    the _________________. ( anus/large intestine)

B. Give one word answer for the following:
1. The hard, white and shiny part of the tooth
2. The chisel-shaped teeth at the front of the mouth
3. The number of molars in each jaw of an adult.
4. The soft tissue that surrounds the base of a tooth.
5. Yellow coating formed by germs on teeth.
6. The process by which food is broken into simpler form

C. Answer the following questions.
1. Draw a well-labelled diagram of the digestive system.
2. What happens to the food in the stomach?
3. What is the function of the liver?
4. What happens to the food in the small and large intestines?
5. Why should we chew our food properly?
6. What are temporary and permanent teeth?
7. Explain the structure of a tooth with the help of a labelled diagram.
8. Write the number and function of each of the following kinds of teeth:
    (a) Molars  (b) Incisors  (c) Canines  (d) Premolars
9. Mention a few ways to protect teeth from decaying.
10. Define 'Temporary Teeth'.

D. Fill in the blanks.
1. Germs form a sticky yellow coating called _______________ on the teeth.
2. The liver pours its digestive juices into the _______________ intestine.
3. We should use __________________ to clean the gaps between the teeth.
4. Chewing helps in breaking down food into _______________ pieces and mixing
    it with the __________________.
5. The __________________ is large, sac-like organ.

E. State whether the following statements are true or false.
1. There are four types of permanent teeth.
2. Temporary teeth don't fall off easily.
3. Enamel is the hardest substance.
4. The small intestine is the smallest portion of the digestive system.
5. Saliva contains enzymes.

F. Tick the correct answer.
1. The undigested food passes into the
    (a) large intestine   (b) small intestine   (c) stomach   (d) anus
2. The visible part of a tooth is the
    (a) dentine   (b) pulp   (c) crown   (d) root
3. The flat and broad teeth used to crush, crack and chew the food are
    (a) incisors   (b) premolars   (c) canines   (d) molars
4. Food is first softened with a watery substance called
    (a) pulp   (b) enzyme   (c) plaque   (d) saliva
5. The soft centre of the tooth is called
    (a) gum   (b) dentine    (c) pulp   (d) root
6. The outer part of the tooth is called
    (a) crown  (b) root  (c) enamel  (d) dentine

G. Complete the following web charts.
1. 

2. 

H. Find nine words related to this chapter in the given grid. The words may read
     forward, backward and across.

Science Std. IV Chapter 2

2. Adaptations for Survival in Plants

A. Answer the following questions.
1. What is habitat?
2. Name the factors which influence the adaptations developed by plants.
3. What are the adaptations of plants that grow in plains?
4. How is a coconut tree adapted to grow in coastal areas?
5. What are adaptations?
6. Name the two categories into which plants have been divided on the basis of
    their habitat.
7. Give adaptations and examples of plants growing in:
    (a) Hills      (b) Deserts      (c) Marshy places
8. How is water lettuce adapted to grow in water?
9. What are underwater plants? How are they adapted to grow under water?
10. Name some plants that do not contain chlorophyll.
11. How is the leaf of a pitcher plant modified to capture insects?

B. Fill in the blanks.
1. Plants that grow on land are known as __________________ plants.
2. A plant adapts itself according to the climatic conditions of its _________________.
3. The trees growing in ___________________ have many branches.
4. Floating plants are ___________________ and ___________________ to
    facilitate floating.
5. In a __________________ plant, the leaf is modified into a pitcher-like structure.
6. Mushroom is a non-green plant that lacks ____________________.

C. Tick the correct answer.
1. Which of these is an example of underwater plants?
    (a) Lotus    (b) Water hyacinth    (c) Hydrilla
2. Which of these plants absorbs food from other sources?
    (a) Mould    (b) Water Lettuce    (c) Cactus
3. Which of these plants has leaves that are waxy and needle-like?
    (a) Coconut   (b) Neem    (c) Cedar
4. Which of these plants have long, hollow, light and flexible stem?
    (a) Underwater plants    (b) Fixed plants    (c) Floating plants.
5. Which of these grows in marshy areas?
    (a) Teak   (b) Cedar tree   (c) Rubber   (d) Mangrove tree
6. Hydrilla is an/a
    (a) underwater plant   (b) floating plant   (c) fixed plant   (d) insectivorous plant
7. Which of these is known as an insectivorous plant?
    (a) Water lily   (b) Pitcher plant   (c) Hydrilla    (d) Cactus

D. Complete the following web charts.

E. Find out the names of ten plants in the given grid. The names may read forward,
     backward and across.

F. Answer in one word or a few words.
1. Trees which shed their leaves in autumn
2. Plants that grow on land

G. Define
1. Insectivorous plants.

Science Std IV Chapter 9

Chapter 9

More about Clothes

A. Fill in the blanks.
1. Synthetic fibres do not absorb ________________ as they are _________________.
2. _______________ and _______________ wear white clothes.
3. Our clothes form a protective layer between _________________ and our body.
4. The traditional dress of _______________ consists of mundu and _______________.
5. A raincoat is made of ________________ material, thereby protecting us from rain.
6. Keeping mothballs or dried neem leaves in woollen clothes keep insects like
    _________________ and _________________ away.

B. Answer the following questions.
1. What is the need to wear clothes?
2. What are synthetic fibres? Give examples.
3. How is natural fibre different from synthetic fibre?
4. Write a note on 'clothes and culture'.
5. How can we take care of our clothes?
6. Why do people prefer wearing cotton clothes during summer?

C. Match the following.
          Column A                              Column B
1. Flax                                    (a) Jammu and Kashmir
2. Phiran                                 (b) Synthetic fibre
3. Rayon                                 (c) Korea
4. Hanbok                               (d) Plant fibre

D. State whether the following statements are true or false.
1. Synthetic fibres are obtained from nature.
2. Cloth is made from fibres.
3. Our clothes do not protect us from insect bites.
4. Clothes should be washed properly with a good quality detergent.
5. Kimono is the national dress of Korea.
6. Many fabrics when twisted together make yarn.
7. Flax and hemp are animal fibres.
8. Coloured clothes should be dried in shade.
9. Synthetic fibres are man-made fibres.
10. Natural fibres are water-proof fibres.

E. Tick the correct answer.
1. Which of these fibres is obtained from plants?
    (a) Lycra      (b) Silk         (c) Hemp
2. Which of these is the traditional dress of Korea?
    (a) Hanbok     (b) Kimono     (c) Phiran
3. Which of these does not absorb sweat?
    (a) Cotton      (b) Lycra     (c) Wool
4. Which of these clothes are very delicate?
    (a) Cotton clothes  (b) Nylon clothes   (c) Silk Clothes
5. Our clothes protect us from
    (a) dust     (b) insect bites    (c) dust and insect bites.
6. Which of these is the traditional dress of Jammu and Kashmir?
    (a) Kimono     (b) Sari    (c) Hanbok    (d) Phiran

F. Unscramble the given words.
1. EJTU     2. CALRY     3. OTCNOT     4. NAYRO    5. LOWOELN   6. MEHP

G. Complete the following web charts.
1. 

2. 

H. Define
1. Natural fibres     2. Synthetic fibres    3. Waterproof material

I. Give reason
1. People prefer wearing cotton clothes during summer.
2. We should not wear synthetic clothes while working in kitchen.

J. Answer in one word.

1. National dress of women of India.
2. Dress made up of waterproof material worn in rainy season.

I. Give two examples of each.
1. Types of fibres.

Science Std IV Chapter 5

5. More About Insects

A. Name the following
1. A useful insect
2. A social insect
3. A wingless insect
4. An insect having sucking type of mouth parts
5. Hard outer covering of an insect
6. Chemicals used to destroy harmful insects
7. The chest of an insect.
8. Thing we get from silkworm.
9. This helps an insect to detect vibration, odour and sound.
10. Diseases spread by insects.
11. Harmful insects.

B. Answer the following questions.
1. What is the function of exoskeleton?
2. What do insects have on their head?
3. What are the legs of insects adapted to?
4. Which part of the body contains the heart and other organ systems of an insect?
5. What is the purpose of living together in colonies?
6. What are the four stages in the life cycle of a butterfly? Explain with a diagram.
7. Give four uses of insects?
8. How can we get rid of harmful insects?
9. What is the function of thorax of an insect.
10. How do composite eyes save insects from their enemies?
11. Name any two insects eaten by humans.
12. Name any two diseases spread by insects.

C. Fill in the blanks.
1. The exoskeleton provides the necessary _________________ as well as
    _____________________ to the body of an insect.
2. Insects have ___________________ eyes that have thousands of 
    _____________________.
3. The series of changes through which an organism passes from birth to death is
    called its ___________________.
4. Some insects help in ____________________ of seeds of plants.
5. Insects do not have ____________________.
6. Insects breathe through small openings called ______________________.
7. The chest of an insect is called ____________________.
8. We get __________________ and ___________________ from beehive.

D. Tick the correct answer.
1. Which of these is without a backbone?
    (a) Parrot      (b) Mosquito     (c) Snake
2. Insects have _____________________ pairs of legs.
    (a) three         (b) two              (c) four
3. Which of these help(s) an insect to detect odour, vibrations and sounds?
    (a) Wings         (b) Composite eyes     (c) Antennae
4. The caterpillar spins a cocoon around itself and is called a
    (a) larva             (b) pupa           (c) butterfly
5. Which of these is made of beeswax?
    (a) Crayon          (b) Pencil        (c) Pen
6. Which of these is/are absent in insects?
    (a) Muscles      (b) Skeleton     (c) Nerves

E. State whether the following statements are true or false.
1. Flea is a wingless insect.
2. Insects do not have a nose.
3. Cockroaches have four stages of development.
4. Insects have three pairs of legs.
5. Butterflies and moths have chewing type of mouthpart.

F. Write a short note on 'colony of insects'.

G. Find out seven words related to this chapter in the given grid. The words may
     read forward, backward and across.

H. Complete the following web chart.




























I. Define
1. exoskeleton    2. spiracles    3.life cycle

J. Give reasons

1. Honeybee is a useful insect.
2. Some insects stay together in colonies.

Science Std IV Chapter 3

Chapter 3

Reproduction in plants

A. Fill in the blanks.
1. Animals that give birth to their young ones are called _______________.
2. ______________ look after their young ones properly.
3. The egg-laying animals include ______________, ______________, acquatic
    animals, _______________ and insects.
4. Amphibians like ________________ lay their eggs in large clusters called
    ________________ in water.
5. A larva is called a _________________ in case of a butterfly and a maggot in
    case of a _________________.
6. The process of change of a ________________ into an _________________
    is called metamorphosis.
7. Inside the yolk lies an ________________.
8. Frogs lays their eggs in large clusters called ________________ in water.

B. Answer the following questions.
1. What is the need for reproduction?
2. Define mammals.
3. What are warm-blooded animals?
4. Explain the structure of an egg with the help of a diagram.
5. What are the different stages of development in birds?
6. What are the various changes which the egg of a frog undergo before becoming
    an adult frog?
7. How many stages of development do insects have?
8. What is reproduction?
9. What are reptiles?
10. What are flippers?
11. What is an embryo?
12. What is an amphibian?

C. State whether the following statements are true or false.
1. The albumen is rich in fat and protects the yolk and the embryo.
2. Cockroaches have three stages of development.
3. Egg-laying animals have a highly developed brain.
4. All reptiles take proper care of their young ones.
5. An embryo lies inside the yolk.
6. Tortoise is a reptile.
7. Birds that lay their eggs are called mammals.
8. The yellow coloured middle part of the egg is called albumen.
9. An early tadpole breathes through gills.
10. Fish do not have a backbone.

D. Tick the correct answer.
1. Which of these lay eggs in large clusters called spawns in water?
    (a) reptiles    (b) amphibians    (c) birds
2. Which of these is a mammal?
    (a) eagle     (b) penguin    (c) bat
3. Which of these can maintain constant body temperature despite changing
    climatic conditions?
    (a) mammals    (b) reptiles    (c) amphibians
4. What is the other name for the larva of a housefly?
    (a) caterpillar    (b) pupa    (c) maggot
5. What is a baby fish called?
    (a) chick     (b) fry     (c) nymph
6. Which of these are present in albumen?
    (a) fats     (b) vitamins    (c) minerals   (d) proteins
7. An egg of a butterfly or housefly develops into a
    (a) nymph    (b) larva    (c) pupa     (d) spawn

E. Answer in one word or a few words.
1. Frogs lay their eggs in large clusters
2. A bird which doesn't lay eggs.
3. Animals that eat only other animals.
4. Animals that live both on land and in water.
5. The albumen is rich in this.
6. This provides nutrition to develop the embryo.
7. Exception in mammals.
8. Scavengers.
9. Egg laying reptiles.
10. Aquatic mammals.

F. Complete the following web chart.

G. Find the names of seven egg-laying animals in the given grid.

H. Give reasons
1. Mammals are called warm-blooded animals.
2. All the eggs of reptiles do not hatch.

I. Define
1. Reproduction   2. Mammals    3. Warm-blooded animals    4. Embryo
5. Spawns    6. Metamorphosis   7. Reptiles

Science Std IV Chapter1

Chapter1

Green Plants - The Food Producers

A. Fill in the blanks.
1. The process of making food by the plants using ______________________,
     __________________ and carbon dioxide in the presence of ___________________
     known as _____________________.
2. A plant uses some amount of the prepared food to carry out its ___________________
    while the rest of the food is stored in the form of ____________________ in fruit,
    leaves, stem or roots.
3. The main vein of a leaf is called the _____________, and the side veins transport
    ______________ from the stem to all parts of the leaf.
4. ______________ is the stored form of sugar.
5. Mushrooms and moulds are known as '_________________'  because they obtain
    nutrition from __________________ plants and animals.
6. _______________ traps the sunlight used for the preparation of food.
7. The food prepared by the leaf is called _________________.
8. Apart from food, ________________ is also given out by plants during photosynthesis.
9. Plants give _____________, ____________ and ______________ to human beings
    and animals.
10. Plants breathe through tiny openings called _________________.
11. Sugar is stored in the form of ___________________.

B. Answer the following questions.
1. What is chlorophyll?
2. What are the functions performed by a leaf?
3. Explain the process of photosynthesis with the help of a diagram
4. What happens to the food prepared by a leaf?
5. Write what happens in the following cases:
    (a) If you put a few drops of iodine solution on a potato slice
    (b) If you put a few drops of iodine solution on a fresh green leaf which has been
         bleached
6. Give examples of plants:
    (a) having variegated leaves  (b) lacking chlorophyll   (c) saprophytic
7. Write a short note on how plants and animals depend on each other.
8. What are saprophytic plants?

C. State whether the following statements are true or false.
1. The green colour of leaves is due to the presence of stomata.
2. The food prepared by the plants is called starch.
3. Stomata help plants in breathing.
4. A yellow leaf turns blue-black when a few drops of iodine solution are put on it.
5. Oxygen is also given out by plants during photosynthesis.
6. Plants breathe through chlorophyll.

7. Mushrooms and moulds are saprophytic plants.
8. The flat part of a leaf is called as midrib.

D. Tick the correct answer.
1. Which of these trap(s) the sunlight?
    (a) stomata  (b) chlorophyll   (c) both of these
2. Which of these cannot prepare food and obtain it from dead and decaying plants
    and animals?
    (a) mould    (b) cactus   (c) croton
3. A green leaf turns blue-black when a few drops of iodine solution are put on it
    showing the presence of
    (a) sugar    (b) chlorophyll    (c) starch
4. Which of these is known as the food factory of a plant?
    (a) Root    (b) Stem    (c) Leaf    (d) Flower
5. Which of these plants has variegated leaves?
    (a) croton    (b) mushroom   (c) cactus
6. Stored form of sugar is called
    (a) stomata   (b) chlorophyll  (c) starch   (d) phoptosynthesis

E. Complete the following web chart.

F. Unscramble the given words.
1. AMTOSTA     2. LROPHYLCOHL    3. STHESISTOPHOYN   4. CHARTS
5. LUDMOS    6. RHPYSAPICTO

G. Answer in one word or few words.
1. The process by which plants make their own food
2. Name four leaves that contain stored food which you eat.
3. Name the grain which we boil in excess water and use its strained water to starch our
    clothes.
4. Substance responsible for imparting green colour to leaves.
5. Part of the plant which absorbs water from the soil.
6. Solution used to prove presence of starch in food.

H. Identify the parts of the plant and give their main functions with the help of a
    neat labelled diagram.

I. Define
1. Chlorophyll    2. Stomata   3. Photosynthesis

J. Give reasons.
1. Plants like mushrooms and moulds depend on dead and decaying plants and animals.
2. Leaves are called food factory of green plants.
3. Plants help to purify air.

K. Write an experiment to show the presence of starch in the potato with the help
    of a neat labelled diagram.

Science worksheet chapter 16

Science worksheet chapter 16

A. State whether the following statements are true or false.
1. It is cooler on sunny days than on windy days.
2. Lack of rain over a period of time results in droughts.
3. Storms do not cause any damage.
4. Weather does not change from place to place.

B. Fill in the blanks with correct option
1. The change of seasons is the result of earth's __________________.
     (rotation/ revolution)
2. During summer, we need to drink plenty of water as we lose a lot of it while
    ___________________ (sweating/ excreting)
3. During winter ________________ (cold/hot) dry air blows.

C.Answer the following questions.
1. What is weather? Does it remain constant?
2. Why are mornings and evenings cooler as compared to the afternoons on sunny days?
3. What happens during a storm?
4. Why is lack of rain or too much of rain not good for us?
5. What are the major seasons of a year?
6. How many seasons is a year divided into?
7. Name the movement which leads to seasons.
8. What happens to trains and aeroplanes in winter due to fog? Why?

D. Match the following
                Column A                                 Column B
    1. Sunny days                            a. Clouds in the sky making the weather pleasant
    2. Rainy season                         b. Hottest time of the year
    3. Cloudy days                           c. Cloudless, warm and bright
    4. Windy days                            d. Dark sky
    5. Summer season                    e. Welcomed by farmers and children
    6. Rainy days                              f. Fast moving wind blows

E. Tick the correct answer
1. Too much rain causes
    a. drought    b. flood    c. thunderstorm
2. We wear sweaters, gloves, etc. during
    a. winter season    b. rainy season.     c. summer season.
3. Which of these changes every day?
    a. Season       b. Weather      c. Both of these
4. On cloudy days, clouds block the sunshine making the weather
    a. hot            b. pleasant           c. unpleasant
5. Which of these seasons is known as the monsoon season?
    a. Summer        b. Winter          c. Rainy
6. Which season witnesses the falling of dry leaves from trees?
    a. Winter         b. Summer      c. Autumn      d. Spring
7. Raincoats and umbrellas are used during
   a. winter season    b. summer season.   c. rainy season    d. spring season
8. On which day can a rainbow be formed in the sky?
   a. Sunny and windy    b. Cloudy and windy    c. Rainy and sunny

F. Complete the following web charts.
1.

 2.

G. Unscramble the following words to get the correct words.
1. NIDYW    2. MUSREM   3. ASESNO    4. HETWEAR

H. Define
1. Drought