Practicing with SCERT Class 6 Basic Science Notes and Kerala Syllabus 6th Standard Basic Science Annual Exam Question Paper 2021-22 English Medium will help students prepare effectively for their upcoming exams.
Class 6 Basic Science Annual Exam Question Paper 2021-22 English Medium
Activity 1
Observe the pictures given below
a) Identify the unicellular organisms and write their names
b) Which device is used to observe micro organisms?
(c) Examine the picture and write down any three findings?
Answer:
a) Amoeba Euglena
b) Microscope
c) We can see animal cell and plant cell in this picture.
i) A Plant cell have cell wall. An animal cell doesnot have cell wall.
ii) Both plant and animal cell have nucleus which is the centre of the cell.
iii) A plant cell have chloroplast. An animal cell does not have chloroplast.
Activity 2
a) What are the forms of energy produced when a filament bulb glows?
b) We know that energy loss happen when a filament bulb glow. Write a situation where this energy is used properly.
c) LED bulb saves energy. Do you agree with this statement? Why?
Answer:
a) Heat energy and Light energy
b) We can use this energy properly in incubators.
c) Yes, I agree with this statement.
In LED Bulb 95% of energy transformed in to light, and 5 % of energy loses in the form of heat energy. It needs less power compared to other bulbs. There force LED bulbs need less energy.
Activity 3
Examine the table given below.
| Features of flowers | Pollinating agents |
| Colour, Smell, honey, Small flowers are seen as inflorescence | Insects, animals, |
| Large number of pollen-grains, pollengrains are lighter in weigh | Wind |
| Stigma is sticky. pollen grains have water waxy coating | Water |
a) Write down three findings comparing features of flowers and pollinating agents.
b) What are the features of bougainvillae and mussaenda flowers that help to attract pollinating agents.
Answer:
a) The cluster of flowers looks like big flowers which attracts pollinating agents.
When the pollengrains are lighter in weight, this makes the pollination easy by wind.
Water is a pollinating agent, when stigma is sticky and pollen grains have waxy coating this helps in pollination by water.
b) The leaves surrounding bougainvillae and mussaenda flower changes colour and gives the appearence of a flower to the pollinating agents like insects for pollination. The advantage is, it increses the chances of pollination and helps the propagation of plant.
Activity 4
Observe the cartoon
How big is the pumpkin fruit! Does the pedicel has the capacity to hold this.
a) What changes occur to the pedicel when the pumpkin flower change into a fruit?
b) What changes occur to various parts of a flower when it become a fruit?
Answer:
a) When the pumkin flower change into a fruit, the pedicel becomes strong enough to support the fruit.
b) Pedicel – becomes stronger to support the fruit.
Thalamus – Becomes stronger, because ovary changes in to fruit.
Calyx – In some flowers it falls off. but in some flowers it be comes stronger.
Corolla – Falls off
Ovary – becomes fruit
Ovule – becomes seeds
Activity 5
Following is a routine food chart of a child.
| Morning | Noon | Night |
| Chips, Cakes Noodles, Soft Drinks | Rice, Pickle Pappad | Porotta, Chicken Fry |
Examine the food chart
a) What are the two possible health problems that the child will face?
b) Prepare a proper food chart to help this child to lead a healthy life.
Answer:
a) Cholesterol, Kwashiorker
b)
| Morning | Noon | Night |
| Idiyappam Egg Curry Milk |
Rice
Sambar Avial Fish fry |
Chappathy
Mixed vegetable curr Apple |
Activity 6
Observe the picture
a) What is the difference between the movement of gaint wheel and the movement of the child on the wheel when it works?
b) How is vibration differ from oscillation? Explain with examples.
Answer:
a) Movement of giant wheel – Rotation Movement of child on the weel – Circular motion
b) Oscillation is the to and fro motion of a body about a mean position.
The motion of the pendulum of a clock is to and fro motion. This is an example of oscillation.
But fast oscillations are called vibrations. When the tuning fork is hit with a rubber hammer the tines begin to vibrate. This is an example for vibration.
Activity 7
The Observation result of an iodine test in various food items is given below.
(a) Analyse the table. Write down your findings.
(b) How can you identify the presence of protein in these food items.
Answer:
a) Rice and boiled potato contain high amount carbohydrate. So it gives dark blue colour when iodine is added.
(ii) Tomato contains small amount of carbohydrate so it gives light blue colour when iodine is added.
Egg and milk does not contain carbohydrates so it doesnot gives positive iodine test.
b) The test to check the presence of protien in food items.
Required materials : copper sulphate, water, sodium hydroxide, dropper, beaker, test tube, the food item.
Procedure: Add some water to the food item which we want to check: Take this upto a quarter of a test tube. Add 8-10 drops of 1% concentrated sodium dydroxide to it. stir it and add 2 drops of 1% concentrated. Copper Sulphate solu-tion to it.
Observation: Violet colour indicates the presence of protien.
Activity 8
Read the news paper report.
| RAT INFESTATION IS INCREASING Vayalnattukara : The number of rats increases extensively in paddy fields. Extensive crop damage is reported in this region. This is attributed to the destruction of the rat snakes that feed on rats. |
The extinction of one species cause problems in ecosystem.
a) If the number of frogs in a area decreases, how will it affect the paddy crop? What other changes happen in the ecosystem due to this?
b) Prepare a poster that convey the message of the importance of protecting our environment.
Answer:
a) If the number of frogs in an area decrease, the number of insects and grasshoppers which destroys the paddy, crop increases. This affect the paddy crops production. If the number of frogs decreases, the number of snakes which eats the frogs also decreses. In the same way insects, mosquitos, grasshoppers which are the food for frog also increases. It adversely affect the ecosystem. Due to the increase in number of mosquitos the diseases like degue, malaria also increases. This will affect the entire ecosystem.
b) Trees are gifts
Protect the trees,
Conserve the environment
Activity 9
Observe the pictures.
Iron powder sticks on magnets
(a) Which figure is correct?
(b) Give reasons
(c) A table prepared by a group of students after conducting an experiment to find out the magnetic power of different magnets is given below.
Analyse the table, Write down your inferences.
Answer:
b) Magnetic force is stronger at the ends of magnet. These end portions of a magnet are the poles of the magnet. Therefore iron dust is more attracted by the poles.
c) The magnetic strength is stronger at the regions near the poles. As the distance from the pole increases the magnetic strength weakens. The region around a magnet where the force of the magnet is felt is the magnetic field.
Activity 10
Observe the table of celestial bodies prepared by a child.
| Star | Planet | Satellite |
| Thiruvathira | Moon | Saturn |
| Cyrius | Jupiter | Sun |
| Titan | Mercury | Ganimid |
a) Correct the mistakes if any.
Observe the images of constellation
b) Identify the constellations and write down their names.
Answer:
| Star | Planet | Satellite |
| Thiruvathira | Saturn | Ganimid |
| Sun | Jupiter | Moon |
| Cyrius | Mercury | Titan |
B. Picture – 1 – Saptharishis
Picture – 2 – Orion
Activity 11
Substances and the molecules present in them are given in the table.
| Substances | Molecules Present |
| Atmospheric air | Nitrogen, Oxygen, Carbondioxide, Water vapou |
| Brass | Zin, Copper |
| Oxygen | Oxygen |
| Gold Ornament | Gold Copper |
| Sugar | Sugar |
| Gold | Gold |
a) Find out the pure substances from the table and write down them
b) What is difference between gold and gold ornament? Explain.
Answer:
a) Pure substances – Oxygen, Sugar, gold
b) Pure gold is 24 carrot gold. It is very soft and cannot be used for making gold ornaments. 22 carrot gold is used for making gold ornaments. 22 carrot gold is an alloy of 22 parts of pure gold and 2 parts of either copper or silver. It is hard. Therefore this 22 carrot gold is used for making gold ornaments.
Activity 12
Examine the activities given below
i. The Hand is rotated
ii. Knee bends while sitting
iii. Looking either sides by moving neck.
a) Write down the name of joints that helps to perform the above activities.
b) What are the precautions taken to a person with fracture before taking to the hospital.
Answer:
a) i) Ball and socket joint
ii) Hinge, joint
iii) Pivot joint
b)
- Tying splints will be helpful.
- Apply ice pack or ice cubes wrapped on clean on the affected area.
- Help the patient to sit comfortable position.
- Encourage the patient to rest.
- Do not move the broken parts.