6th Standard Science - Summative Assessment (Sept 2024) Solutions
Here are the detailed solutions for the Virudhunagar District, Standard 6 Science, Summative Assessment held in September 2024. This will help students to review their answers and understand the concepts better.
I. Choose the correct answer:
1) Which among the following is an oscillatory motion?
2) Seeds from water-melon can be removed by ______
3) Organ of absorption is ______
4) Which animal has the special organs of breathing called gills?
5) Bacteria are very small ______ micro organism.
II. Fill in the blanks:
6) SI unit of length is metre (m).
7) In solids the space between the particles less than in liquids / gases.
8) Primary organs of photosynthesis are leaves.
9) Amoeba moves with the help of pseudopodia (false feet).
10) Iodine deficiency leads to goitre.
III. Match it:
| Question | Correct Match |
|---|---|
| a) Nano | 10⁻⁹ |
| b) Bends readily | Rubber band |
| c) Can be streched easily | Plastic wire |
| d) Mountain | Himalayas |
| e) Stem | Branches |
IV. Analogy:
12) Sugar : Beam balance
Lime Juice : Measuring Jar / Measuring Cylinder
13) Kicking a ball : Contact force
Falling of leaves : Non-contact force (Gravitational force)
14) Iron sulphur mixture : Magnetic separation
Mustard seeds from Urad-dhal : Rolling
15) Solid : Definite shape
Liquid : Shape of vessel
16) Solid : Rigidity
Gas : Compressibility / Fluidity
V. State True or False. If false correct the statement:
17) Ten millimetre makes one centimetre.
True.
18) Air is not compressible.
False.
Correct statement: Air is highly compressible.
19) Plants can live without waterAmoeba is a unicellular organism and its move with Pseudopodia.
True.
(Assuming the statement is about Amoeba, as it is repeated in the next question. The OCR text seems to have merged two separate statements. The statement "Amoeba is a unicellular organism and its move with Pseudopodia" is True.)
20) Amoeba is a unicellular organism and its moves with pseudopodia.
True.
21) Iron helps in the formation of Haemoglobin.
True.
VI. Answer very briefly: (any ten only)
22) Define measurement.
Measurement is the comparison of an unknown quantity with some known quantity of the same kind. The known fixed quantity is called a unit.
23) Define mass.
Mass is the measure of the amount of matter contained in an object. Its SI unit is the kilogram (kg).
24) The distance between two places is 43.65 km. Convert it into metre and cm.
To metre: 1 km = 1000 m. So, 43.65 km = 43.65 × 1000 = 43,650 m.
To centimetre: 1 m = 100 cm. So, 43,650 m = 43,650 × 100 = 43,65,000 cm.
25) Define force.
A force is a push or a pull upon an object resulting from the object's interaction with another object. It can change the state of rest or motion of an object.
26) Name different types of motion.
Linear motion, Circular motion, Rotational motion, Oscillatory motion, Random motion, and Periodic motion.
27) Differentiate between rotational and curvilinear motion.
Rotational Motion: An object moves about a fixed axis without changing its position. Example: A spinning top.
Curvilinear Motion: An object moves along a curved path. Example: A stone thrown in the air.
28) Why do we separate mixture?
We separate mixtures to: (i) remove undesirable or harmful components, (ii) obtain useful components, and (iii) obtain a substance in a highly pure form.
29) Define sedimentation.
Sedimentation is the process in which heavier, insoluble solid particles in a liquid mixture settle down at the bottom of the container when left undisturbed.
30) Give the main difference between a pure substance and impure substance.
A pure substance consists of only one type of particle (atom or molecule) and has fixed physical properties. An impure substance (mixture) consists of two or more types of particles and does not have fixed properties.
31) Mention few desert plants.
Cactus, Date Palm, Acacia, Prickly Pear.
32) Define the term habitat.
A habitat is a natural home or environment of an animal, plant, or other organism. It provides the organism with food, water, shelter, and space.
33) Where can we see camels in India?
Camels in India are primarily found in the Thar Desert region of Rajasthan.
34) Name the locomotory organ of an Amoeba.
The locomotory organ of an Amoeba is the pseudopodia (false feet).
35) What are the body parts of snake?
A snake's body is typically divided into the head, trunk, and tail. They move using their flexible backbone and broad belly scales.
36) Which structure helps the birds to change its direction while flying in air?
The tail of the bird helps it to steer and change direction while flying.
37) Differentiate between Carbohydrate and Protein.
Carbohydrates: They are energy-giving foods. Sources include rice, wheat, and potatoes.
Proteins: They are body-building foods essential for growth and repair. Sources include pulses, eggs, and milk.
38) Define balanced diet.
A balanced diet is a diet that contains all the essential nutrients like carbohydrates, proteins, fats, vitamins, and minerals in adequate and correct proportions.
39) Why should fruits and vegetables washed after cutting?
Fruits and vegetables should be washed before cutting. Washing them after cutting can lead to the loss of water-soluble vitamins (like Vitamin C and B-complex) from their cut surfaces.
40) What is computer?
A computer is an electronic device that manipulates information, or data. It has the ability to store, retrieve, and process data according to a set of instructions.
VII. Answer in detail: (any three only)
41) Explain two methods that you can use to measure the length of a curved line.
Method 1: Using a String
1. Take a string and place it along the curved line, starting from one end.
2. Carefully trace the path of the curved line with the string until you reach the other end.
3. Mark the points on the string that correspond to the start and end of the line.
4. Straighten the string and measure the length between the two marks using a standard ruler. This length gives the length of the curved line.
Method 2: Using a Divider
1. Take a divider and open its two arms to a small, convenient fixed distance (e.g., 1 cm).
2. Place one tip of the divider at the starting point of the curved line and let the other tip fall on the line.
3. Without changing the distance, move the first tip to the position of the second tip and repeat this process along the entire line.
4. Count the number of steps. The length of the line is approximately (number of steps × distance between tips) + length of the remaining part (which can be measured with a ruler).
42) Classify different types of motions with example.
The different types of motion are:
- Linear Motion: Motion along a straight line. Example: A car moving on a straight road.
- Circular Motion: Motion of an object along a circular path. Example: The tip of the hands of a clock.
- Rotational Motion: The movement of an object about its own axis. Example: The rotation of the Earth on its axis.
- Oscillatory Motion: A to and fro motion of an object from its mean position. Example: The movement of a simple pendulum.
- Periodic Motion: Motion that repeats itself after a regular interval of time. Example: The revolution of the Moon around the Earth.
- Random Motion: Motion that is irregular and unpredictable. Example: The movement of a flying butterfly.
43) Make a list of the function of root and stem.
Functions of the Root:
- Anchorage: It fixes the plant firmly to the soil, providing support.
- Absorption: It absorbs water and essential minerals from the soil.
- Conduction: It transports the absorbed water and minerals up to the stem.
- Storage: In some plants like carrots and beetroots, roots store food.
- Support: It supports the branches, leaves, flowers, and fruits, holding them up to receive sunlight.
- Conduction: It transports water and minerals from the roots to the leaves, and transports food prepared by the leaves to all other parts of the plant.
- Food Storage: Stems of some plants like sugarcane and potato store food.
- Photosynthesis: Young, green stems contain chlorophyll and can perform photosynthesis.
44) Describe the various features which help Camel dwell well in the desert.
Camels have several adaptations to survive in the desert:
- Hump: They store fat in their hump, which can be metabolized for energy and water when food is scarce.
- Long Eyelashes and Closable Nostrils: These protect their eyes and nose from blowing sand.
- Thick Lips: Allow them to eat thorny desert plants without injury.
- Large, Padded Feet: Their wide, flat feet spread their weight and prevent them from sinking into the sand.
- Water Conservation: They can drink a large amount of water at once and conserve it efficiently. They excrete concentrated urine and dry dung to minimize water loss.
- Body Temperature Regulation: They can tolerate large fluctuations in their body temperature, which helps them conserve water by reducing sweating.
45) Tabulate the vitamins and their corresponding deficiency diseases.
| Vitamin | Deficiency Disease |
|---|---|
| Vitamin A | Night Blindness |
| Vitamin B1 | Beri-Beri |
| Vitamin C | Scurvy (bleeding gums) |
| Vitamin D | Rickets (weak bones in children) |
| Vitamin E | Sterility (Infertility) |
| Vitamin K | Haemorrhage (Failure of blood to clot) |