Living Science 2020 2021 Solutions for Class 6 Science Chapter 18 Half Yearly Test Paper are provided here with simple step-by-step explanations. These solutions for Half Yearly Test Paper are extremely popular among Class 6 students for Science Half Yearly Test Paper Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Living Science 2020 2021 Book of Class 6 Science Chapter 18 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Living Science 2020 2021 Solutions. All Living Science 2020 2021 Solutions for class Class 6 Science are prepared by experts and are 100% accurate.
Page No 107:
Question 1:
Some animals depend on other living animals for food. What are they known as?
Answer:
Animals which depend upon other living animals for food are called parasites.
Page No 107:
Question 2:
Name one plant that stores food in its leaves.
Answer:
Spinach stores food in its leaves.
Page No 107:
Question 3:
Which nutrient does our body need to make new cells?
Answer:
Our body require proteins to make new cells.
Page No 107:
Question 4:
Deficiency of which nutrient causes anaemia?
Answer:
Anaemia is caused due to the deficiency of iron.
Page No 107:
Question 5:
Which fibres dry faster−synthetic or natural?
Answer:
Synthetic fibres cannot retain water and they dry faster.
Page No 107:
Question 6:
Which natural fibre is fluffy and retains a lot of air?
Answer:
Wool is fluffy and retains a lot of air.
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Question 7:
The objects in a collection have exactly the same properties. Is it possible to classify them into different groups?
Answer:
One set of properties may be the same. However, some other properties may be different. For example, a frog is classified as an animal and so is a snake, but a pitcher plant is classified as a plant. Now, if we make a classification of insectivores (insect eaters), then the frog and the pitcher plant will be classified together.
Page No 107:
Question 8:
Molecules in this state of matter can move freely in the space available to them. Identify the state.
Answer:
In the gaseous state, molecules can move freely in space available to them.
Page No 107:
Question 9:
Name the method of separation you can use to get salt from water containing dissolved salt.
Answer:
By evaporation method, we can easily separate dissolved salt in water.
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Question 10:
Which method can be used to speed up sedimentation?
Answer:
Loading can be used to speed up sedimentation.
Page No 107:
Question 11:
When water boils, its molecules start moving faster and many of them escape from water. Is boiling a chemical or a physical change?
Answer:
Boiling of water is a physical change because in boiling only the form of water is changed.
It changes from liquid to gaseous state.
Page No 107:
Question 12:
All irreversible changes are chemical changes. True or false?
Answer:
Yes, all irreversible changes are chemical changes because in chemical change new substances formed during a chemical reaction are not easily be get back to the original substances.
Page No 107:
Question 13:
Muscles pull and push the bones to make them move. True or false?
Answer:
The given statement is false because muscles can pull the bones but they can not push them.
Page No 107:
Question 14:
The stem of a plant bends towards light. This property is known as ___________
Answer:
The property of the stem to bend towards light is called phototropism.
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Question 15:
After pollination, the ovary in a flower swells up and changes into a __________
Answer:
The ovary of a flower develops into a fruit after pollination.
Page No 107:
Question 1:
Why is rusting classified as a chemical change?
Answer:
The molecules of iron are not the same as the molecules of rust. In the process of rusting, new molecules are created. Further, once a metal has rusted, there is no simple way to get back the metal. As a result, rusting of metal is a chemical change.
Page No 107:
Question 2:
Give an example of a plant responding to stimuli.
Answer:
The leaves of the Mimosa plant droop when touched. This is an example of response to stimulus in plants.
Page No 107:
Question 3:
Why do plants growing in hot deserts normally have small leaves?
Answer:
Plants loose water by transpiration from the leaves. Small leaves have a smaller area and less water is lost through transpiration in such cases. Therefore, desert plants have small leaves.
Page No 107:
Question 4:
Bones cannot move by themselves. What makes bones move at the joints?
Answer:
Bones are connected to muscles by means of tendons. Muscles contract and pull on the bones by means of the tendons. This is how bones move.
Page No 107:
Question 5:
A snake has teeth, but it does not chew its food. In what way does a snake use its teeth?
Answer:
All snakes have inward curving teeth that help the snake secure a grip on its prey and swallow it. Venomous snakes also posses modified teeth known as fangs, which is used to inject venom into prey.
Page No 107:
Question 6:
What is the function of carbohydrates in food?
Answer:
Carbohydrates are a source of energy. In the process of respiration, carbohydrates from food combines with oxygen inhaled to give energy.
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Question 7:
What is sericulature?
Answer:
Sericulture is the cultivation of silkworms on mulberry plants to harvest silk.
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Question 8:
What kind of movement do molecules in a solid undergo?
Answer:
Molecules of a solid can only vibrate about their equilibrium positions.
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Question 9:
What does the process of distillation involve?
Answer:
The process of distillation involves boiling a mixture and then condensing the vapour obtained to get a pure liquid.
Page No 107:
Question 10:
What is the difference between the structural units of living things and those of non-living things?
Answer:
The structural units of living beings are cells. The cells are themselves living and constitute the building unit of every living being. All non-living things are made up of atoms and molecules. Molecules are the building unit of non-living things.
Page No 107:
Question 1:
Explain the difference between physical and chemical changes on the basis of changes that take place at the molecular level.
Answer:
| Physical change | Chemical change |
| No new molecules are created. | New molecules are created. |
| The same molecules remain before and after the physical change. | The molecules of the reactant and product are different in a chemical change. |
Page No 107:
Question 2:
Why are cotton clothes more comfortable to wear than nylon clothes in summer?
Answer:
Cotton clothes can allow air to pass through them, unlike nylon clothes. Also, cotton clothes can absorb sweat, which nylon clothes cannot. The air passing through the cotton clothes then evaporates the absorbed sweat and cools down the wearer. This makes cotton clothes more comfortable than nylon clothes.
Page No 107:
Question 3:
Give two ways in which living and non-living things are similar.
Answer:
Living and non-living things are made up of matter. So, both have mass and occupy space.
Page No 108:
Question 4:
What are the two main functions of roots?
Answer:
Two main functions of roots are:
- Roots anchor the plant to the ground and provide support.
- Roots are responsible for absorbing nutrients and water from the soil, which is required for the survival and growth of the plant.
Page No 108:
Question 5:
Explain the structure of the backbone.
Answer:
The human backbone is made up of 33 smaller bones known as vertebrae. Between any two vertebrae is the spinal disc that cushions movements between the vertebrae. The vertebrae near the top of the backbone are the smallest and the ones at the bottom are the largest. Each vertebra has horn like projections where muscles attach and allow movement of the spine.
Each vertebra also has a passage through it. The spinal cord passes through this passage.
Page No 108:
Question 6:
Draw labelled diagrams to show the difference between a tap root and a fibrous root.
Answer:
The difference between tap root and fibrous root can be illustrated as follows:
It is clear from the above figure that in a tap root, a lateral root arises from a main root. In fibrous roots, on the other hand, no main root is present.
Page No 108:
Question 1:
Which of these provide us with quick energy?
(a) carbohydrates
(b) fats
(c) proteins
(d) both a and b
Answer:
(a) carbohydrates
Quick energy is provided by carbohydrates.
Page No 108:
Question 2:
A food chain cannot end at a/an
(a) herbivore.
(b) carnivore.
(c) omnivore.
(d) human.
Answer:
(a) Herbivore.
A food chain cannot end at a herbivore as they are the producers that produce food for other organisms.
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Question 3:
Which of these is not a nutrient but is still very necessary in our diet?
(a) vitamins
(b) water
(c) roughage
(d) both b and c
Answer:
(d) both b and c
Water and roughage are not nutrients but are still very necessary for our diet.
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Question 4:
Given below are some desirable properties of fabrics. In which of these properties is cotton considered better than nylon?
(a) light weight
(b) strong
(c) absorbs water
(d) wrinkle free
Answer:
(c) absorbs water
Cotton can absorb water better than nylon.
Page No 108:
Question 5:
A molecule of water is made up of
(a) atoms of water.
(b) atoms of hydrogen.
(c) atoms of oxygen.
(d) atoms of hydrogen and oxygen.
Answer:
(d) atoms of hydrogen and oxygen.
A water molecule is made up of two atoms of hydrogen and one atom of oxygen.
Page No 108:
Question 6:
A solid has a definite volume because
(a) its molecules are tightly packed together.
(b) its molecules are loosely packed and can slip over each other.
(c) its molecules are far apart from each other and can move freely.
(d) its molecules are hard and rigid.
Answer:
(a) Its molecules are tightly packed together.
The molecules in a solid are tightly packed together. This gives a solid a definite volume.
Page No 108:
Question 7:
(a) separating funnel
(b) evaporation
(c) distillation
(d) decantation and filtration
Answer:
With the help of decantation and filtration, solid and liquid can be easily be separated. By pouring a liquid into another jar solid residue will leave behind and can easily be separated.
Hence, the correct answer is option d.
Page No 108:
Question 8:
Which of these will definitely result in a chemical change?
(a) heating
(b) burning
(c) mixing
(d) melting
Answer:
(b) Burning
Burning will definitely result in a chemical change.
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Question 9:
Which of these is not a chemical change?
(a) changing of ice to water
(b) changing of milk to curd
(c) rusting of iron
(d) both a and b
Answer:
Changing of ice to water is a physical change.
Hence, the correct answer is option a.
Page No 108:
Question 10:
Growth in multicellular organisms occurs by
(a) addition of new external layers.
(b) addition of new internal layers of nutrients.
(c) growth in size of cells.
(d) increase in number of cells.
Answer:
(d) increase in the number of cells.
Multicellular organisms grow by cell division. This leads to an increase in the number of cells.
Page No 108:
Question 11:
Which of these properties of living things is not present in a large number of living things?
(a) movement
(b) respiration
(c) feeding
(d) reproduction
Answer:
(a) movement
Many living organisms such as plants do not show movement.
Page No 108:
Question 12:
Which of these is not a flowering plant?
(a) mango
(b) carrot
(c) fern
(d) maize
Answer:
(c) fern
Ferns are non-flowering plants.
Page No 108:
Question 13:
Which of these is not a part of the male part of a flower?
(a) filament
(b) anther
(c) style
(d) pollen grains
Answer:
(c) style
Style is the female part of the flower.
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Question 14:
Which system of the body controls all other systems?
(a) digestive
(b) respiratory
(c) nervous
(d) circulatory
Answer:
(c) nervous
The nervous system of the body controls all other systems of the body.
Page No 108:
Question 15:
Which of these joints allows maximum movement?
(a) elbow
(b) shoulder
(c) lower jaw
(d) vertebrae joints
Answer:
(b) Shoulder
Ball and socket joints allow maximum movement. The shoulder consist of a ball and socket joint.
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