The DAV Class 6 Science Solutions and DAV Class 6 Science Chapter 7 Question Answer – The World of Living are essential study tools for DAV public school students in Class 6.
DAV Class 6 Science Ch 7 Question Answer – The World of Living
DAV Class 6 Science Ch 7 Solutions – The World of Living
Something To Know
A. Fill in the blanks.
Question 1.
Plants, animals and human beings are collectively known as ______
Answer:
living beings
Question 2.
Amoeba is a ______ organism.
Answer:
unicellular
Question 3.
The process, used by plants to synthesise their own food, is known as ______
Answer:
photosynthesis
Question 4.
All living organisms respond to various kinds of ______
Answer:
stimuli,
Question 5.
______ are very small plants.
Answer:
herbs
B. Write True or False for the following statements.
1. Amoeba is a plant.
2. Living organisms exhibit many variations due to their habitats and habits.
3. Many non-living things can be moulded in different forms or shapes.
4. All living things die.
5. Lotus is an example of hydrophytes.
6. Invertebrates do not possess a backbone.
Answer:
1. Amoeba is a plant. (False)
2. Living organisms exhibit many variations due to their habitats and habits. (True)
3. Many non-living things can be moulded in different forms or shapes. (False)
4. All living things die. (True)
5. Lotus is an example of hydrophytes. (True)
6. Invertebrates do not possess a backbone. (True)
C. Tick (✓) the correct option.
1. Which of these statements is true for plants?
(a) Non-green plants are autotrophic
(b) Green plants are autotrophic
(c) All plants are heterotrophic
(d) All non-green plants are saprophytes
Answer:
(b) Green plants are autotropic
2. Which of the following plants belongs to the category of shrubs?
(a) Mango
(b) Rose
(c) Neem
(d) Tulsi
Answer:
(d) Tulsi
3. Which one among these is not a flowering plant?
(a) Grasses
(b) Algae
(c) Rose
(d) Mango
Answer:
(b) Algae
4. Biennial plants are those plants which live for
(a) Many years
(b) Three years
(c) Two years
(d) One year
Answer:
(c) Two years
5. All living organism have
(a) Bones
(b) Feathers
(c) Cells
(d) Stems
Answer:
(c) Cells
6. Which of these is an invertebrate?
(a) Snail
(b) Sparrow
(c) Cobra
(d) Frog
Answer:
(d) Frog
D. Answer the following questions in brief.
Question 1.
Name any three important characteristics of living beings.
Answer:
Characteristics of living beings
- Living beings are made up of cells
- Living things grow
- Living things need food
Question 2.
State the difference between autotrophs and heterotrophs.
Answer:
Autotrophs make their own food, while heterotrophs do not make their own food.
Question 3.
Give two examples each of annual, biennial and perennial plants.
Answer:
| Annual | Biennial | Perennial |
| Vegetables, rice | Carrot, radish | Mango, guava |
Question 4.
Give two examples each of animals which reproduce (i) by laying eggs and (ii) by giving birth to young ones.
Answer:
Animals which reproduce by laying eggs: Hen, lizard Animals which reproduce by giving birth to young ones: Cat, dog
Question 5.
Give two examples each of vertebrates and invertebrates.
Answer:
Vertebrates: Man, pigeon
Invertebrates: Cockroach, earthworm
Question 6.
Write the names of any four useful products obtained from plants.
Answer:
Food, Resin, Rubber, Wood
E. Answer the following questions.
Question 1.
‘All living things respond to external stimuli’. Justify this statement with examples.
Answer:
All living things respond to external stimuli. This can be observed by the following examples. When your hand accidentally touches a hot iron, you quickly remove your hand away. Here, hot iron is a stimulus and you are responding to that stimulus. When leaves of mimosa are touched, the leaves droop in response to the touch.
Question 2.
A cloud is considered as non-living even though it can move and can grow bigger. Explain why.
Answer:
A cloud cannot move on its own. It needs some external force to move. Similarly, the growth in a cloud does not come from inside. Hence, a cloud is considered as non-living.
Question 3.
Write two points of difference between (i) herbs and shrubs and (ii) shrubs and trees.
Answer:
| Herbs | Shrubs | Tree |
| Very small in size; up to one foot. | Medium size, up to 4 to 5 feet. | Big in size and can be even 100 feet. |
| Stem is absent. | Greenish or brown but soft stem. | Very hard and thick stem. |
Question 4.
State the differences between oiennial and perennial plants
Answer:
A biennial plant lives up to two years, while a perennial plant lives for many years. Most of the big trees are perennial plants. Biennial plants bear flowers and fruits in the second year. Perennial plants bear flowers and fruits many times in their lifetime.
Question 5.
Name two types of terrestrial plants. How do they differ on the basis of their habitat and water requirements?
Answer:
Two types of terrestrial plants are mesophytes and xerophytes. Mesophytes can survive in moderate temperature and moderate amount of water. Xerophytes can survive in very high temperature and in presence of negligible water.
Question 6.
How are vertebrates different from invertebrates?
Answer:
Vertebrates have backbone in their body, while invertebrates do not have backbone. Vertebrates have skeleton made of bones. Invertebrates lack such skeleton.
Question 7.
Write any four uses of animals in our daily life.
Answer:
Four uses of animals in our daily life:
- Some animals are used for transportation and for farm-related work.
- Animal excreta is used as manure.
- Silk is obtained from silk moth and wool is obtained from sheep.
- Milk, honey, egg and meat are important foods which are obtained from animals.
Value Based Questions
Sanchi noticed a collection of leaves, grass and some tiny twigs in one corner of her school building. She was about to remove them when her teacher, who was passing nearby, stopped her from doing so. The teacher told her that it was a nest being made by a bird, to lay its eggs. She advised Sanchi to be kind and considerate towards all living beings.
Question 1.
List the values displayed by Sanchi’s teacher.
Answer:
Care for animals, empathy, care for environment
Question 2.
Give one example of each of (i) a vertebrate (ii) an invertebrate animal that ‘reproduce through eggs’.
Answer:
Snake is a vertebrate which lays eggs, while cockroach is an invertebrate which reproduce through eggs.
Question 3.
State the reason that might have made Sanchi think of removing the collection of leaves, twigs, etc. from the corner of her school building.
Answer:
Sanchi may have mistaken the collection for garbage. She must have wanted to clean the surroundings. Hence, she thought of removing the collection of leaves, twigs, etc. from the corner of her school building.
Question 4.
Have a group discussion in which some students speak in favour of Sanchi’s reason for removing the nest, while others speak in favour of the advise given by the teacher.
Answer:
Do it yourself.
Something To Do
Question 1.
Write down the uses of plants in the given spaces.
Answer:
- Fruit
- Vegetable
- Medicinal Herb
- Rubber
- Resin
- Wood for paper
- Timber for furniture
- Roots as food
- Lac
- Catechu
Question 2.
Search, Think and Act.
(a) Collect information from different newspapers, magazines, journals and internet about the animals, their habitat and different features of adaptation. Make a scrap file.
Answer:
Do it yourself.
(b) Visit a tourist spot/sanctuary/national park and try to get the information about the commonly found plants and animals at that place. Discuss with your teacher how they adapt to their habitat.
Answer:
Do it yourself.
Question 3.
Try to solve me:
(a) I am a mesophyte. My fruit is liked by you all. It is known as king of fruits. Who am I?
Answer:
Mango
(b) We have strong bony skeleton and well-developed bodies. Who are we?
Answer:
Vertebrates
(c) I am structural and functional unit of life, all animals and plants have their basic unit as me. Who am I?
Answer:
Cell
Question 4.
Write a letter, a prayer or a poem to God, expressing your thanks about bounties which nature has bestowed upon all of us.
Answer:
Do it yourself.
DAV Class 6 Science Chapter 7 Solutions – The World of Living
I. Fill in the blanks.
Question 1.
An animal shows ______ growth.
Answer:
Determinate
Question 2.
A plant shows ______ growth.
Answer:
Indeterminate
Question 3.
The process of removal of waste products, by a living being, is called ______
Answer:
Excretion
Question 4.
Rubber is obtained from a ______
Answer:
Plant
Question 5.
Wool is mainly obtained from ______
Answer:
Sheep
Question 6.
Silk is obtained from ______
Answer:
Silk moth
Question 7.
Eggs and meat are obtained from ______
Answer:
Animals
Question 8.
Living things need ______ for growth
Answer:
Food
Question 9.
During ______ plants give off oxygen.
Answer:
Photosynthesis
Question 10.
______ is the fundamental unit of life.
Answer:
Cell
II. Tick (✓) the correct option.
1. Which of these is a living being?
(a) Brick
(b) Mushroom
(c) Soil
(d) Stone
Answer:
(b) Mushroom
2. Which of these is a unicellular organism?
(a) Amoeba
(b) Earthworm
(c) Hydra
(d) Cockroach
Answer:
(a) Amoeba
3. Which of these is a multicellular organism?
(a) Bacteria
(b) Yeast
(c) Mushroom
(d) Spirogyra
Answer:
(c) Mushroom
4. Which of these animals is the source of silk?
(a) Silk moth
(b) Silk spider
(c) Octopus
(d) Hydra
Answer:
(a) Silk moth
5. Which is the main source of wool?
(a) Camel
(b) Goat
(c) Sheep
(d) Yak
Answer:
(c) Sheep
6. Which of these is an oviparous animal?
(a) Camel
(b) Bat
(c) Rabbit
(d) Hen
Answer:
(d) Hen
7. Which of these is a viviparous animal?
(a) Pigeon
(b) Lizard
(c) Rabbit
(d) Snake
Answer:
(c) Rabbit
8. Which of these is an example of vertebrates?
(a) Leech
(b) Earthworm
(c) Lizard
(d) Cockroach
Answer:
(c) Lizard
9. Which of these is an example of invertebrates?
(a) Snake
(b) Frog
(c) Fish
(d) Octopus
Answer:
(d) Octopus
10. What is the life span of bacteria?
(a) Few hours
(b) Few days
(c) Few weeks
(d) Few months
Answer:
(a) Few hours
III. Answer these questions.
Question 1.
How will you define a cell?
Answer:
Cell is the basic unit of life. It is a structural and functional unit of life.
Question 2.
What is the difference between unicellular and multicellular organisms?
Answer:
A unicellular organism is composed of a single cell, while a multicellular organism is composed of more than one cell. Unicellular organisms are too small to be seen by naked eyes.
Answer:
| Unicellular organism | Multicellular organism |
| They are composed of a single cell. | They are composed of more than one cell. |
| They are too small to be seen by naked eyes. | Most of them are large enough to be seen by naked eyes. |
| Examples: amoeba, bacteria. | Examples’, man, leech. |
Question 3.
Explain nutrition in living beings.
Answer:
The process by which a living being takes and utilizes food is called nutrition. Green plants prepare their own food and hence they are called autotrophs. All other living beings directly or indirectly depend on green plants and hence they are called heterotrophs.
Question 4.
What is respiration?
Answer:
A living being breaks down the food to release energy so that this energy can be utilised for various functions. This process is called respiration.
Question 5.
What is reproduction?
Answer:
A living thing produces its own kind and the process is called reproduction. Reproduction is the way by which a living being maintains its race on the earth.
Question 6.
What are the main criteria on which plants can be classified?
Answer:
Plants can be classified on the following criteria:
(a) Size, shape and height
(b) Life span
(c) Absence or presence of flowers
(d) Habitat
(e) Nutrition
Question 7.
How many types of plants are there on the basis on the habitat? Write their names also.
Answer:
Based on their habitat, plants can be classified into three types which are as follows:
(a) Mesophytes
(b) Xerophytes
(c) Hydrophytes
Question 8.
What do you understand by a saprophytic plant?
Answer:
Plants which feed on dead and decaying bodies are called saprophytes. Examples: mushroom and other fungi.
Question 9.
What do you understand by invertebrates?
Answer:
Animals which have a soft body and which don’t have bony skeleton are called invertebrates. Backbone is absent in such animals. Examples: earthworm, cockroach, snail, octopus, starfish, etc.
Question 10.
Explain the classification of animals on the basis of modes of reproduction.
Answer:
Classification of animals on the basis of reproduction: On this basis, animals can be divided into following groups:
(a) Reproduction by dividing the body: Amoeba and hydra are examples of animals which reproduce by dividing their body.
(b) Egg laying animals: Animals which lay eggs are called oviparous or egg-laying animals. Examples: hen, turtle, crocodile, etc.
(c) Viviparous Animals: Animals which give birth to young ones are called viviparous animals. Examples: man, elephant, horse, etc.
IV. Projects
Question 1.
Collect pictures of three herbs, shrubs and trees and paste them in your scrapbook.
Answer:
Do it yourself.
Question 2.
Make a list of five oviparous animals and five viviparous animals.
Answer:
Do it yourself.
Question 3.
Ask your teacher to show explanation of why the leaves of mimosa droop when they are touched.
Answer:
Do it yourself.