# Class 07 NCERT Solutions

### Science Chapter-11: Transportation in Animals and Plants

1. Match the structures to its respective functions:
 Column I Column II (1) Stomata (2) Xylem (3) Root hairs (4) Phloem (i) Absorption of water (ii) Transpiration (iii) Transport of food (iv) Transport of water (v) Synthesis of carbohydrates

### Science Chapter-12: Reproduction in Plants

QUESTIONS:

Q.1.Fill in the blanks:

a) The new individuals which are produced of from the vegetative part of parent is called ______

b) Either male or female reproductive parts may be present in flowers. Such a flower is called______

c) Pollen grains which are transferred to the stigma from the anther of the same or of another flower of the same kind is known as_______

### Science Chapter-14: Electric Current and its Effects

QUESTION:

Q.1.Draw the following electrical components: connecting wires, bulb, cell, switch in ‘ON’ and ‘OFF’ position and battery.

### Science Chapter-03: Fibre to Fabric

• Is silkworm a larva or a caterpillar? Or both?

Ans. Both

### Science Chapter-13: Motion and Time

Q.1.Identify the following actions:

(a)The hand movement when you are running.

(b) Pulling of cart by a cow on the road.

(c)Train motion on a straight bridge.

(d)The hammer motion in an electric bell.

### Science Chapter-18: Wastewater Story

Q1. Fill in the blanks:

1. Cleaning of water is a process of removing _______.
2. Wastewater released by houses is called _______.
3. Dried _______ is used as manure.
4. Drains get blocked by _______ and _______.

### Science Chapter-16: Water: A Precious Resource

Q1. Mark ‘T’ for a correct statement and ‘F’ for a false statement

a) The quantity of freshwater found in our earth is much more than that present in the lakes and rivers.(T/F)

### Science Chapter-05: Acids, Bases and Salts

Q-1) State the differences between acids and bases.

Ans.)

Acids Bases

1. a) Taste of acids is sour. a) Taste of bases is bitter.
2. b) Acids turn blue litmus paper into red. b) Bases turn red litmus paper to blue.
3. c) Acids contain H+ ( hydrogen ion) c) bases contain OH- ( hydroxyl ion)

### Science Chapter-02: Nutrition in Animals

Fill in the blanks.

1. The major points of nutrition that are in humans are_________ , ___________ , _________ , _________ and __________.
2. ________is the largest gland in human body.
3. The stomach releases hydrochloric acids and _______ juices which directly acts on the food.
4. The finger like growth in the inner wall of the small intestine are called _________.
5. Food digested by amoeba is stored in a ________.

### Science Chapter-17: Forests: Our Lifeline

Q.1. Explain how animals make forest clean and regenerate.

Ans:

Animals help in cleaning forest in many ways. They are also known as cleansing agents. Degeneration is caused by microorganisms. Pollination is caused by animals which help in growing many numbers of plants. Carnivores live by depending on herbivores. Thus, forest has mutual relationships between flora and fauna.

### Science Chapter-01: Nutrition in Plants

1-Why organisms need to take food?

Ans:

Growth is the main reason for all the organisms to take food. Food provides essential energy to run and walk.The main reason is to repair the damaged and injured parts of the body and also, it provides a shield against deadly diseases and increases immunity against many infections.

### Science Chapter-09: Soil

Q1. Identify the following processes :

1. Beating aluminum to make foil
2. Digestion of food
3. Melting of wax
4. Burning of coal
5. Photosynthesis
6. Sugar dissolving in water

### Science Chapter-08: Winds, Storms and Cyclones

Q1. Fill the missing word in the blanks

1. _____ air is wind.
2. Due to the ___ heating on the earth winds are generated.
3. ____air rises up and _____ air comes down near the earth’s surface.
4. Air moves from a region of _____ pressure to a region of _____ pressure.

### Science Chapter-07: Weather, Climate and Adaptations of Animals to Climate

Q-1) Name the elements that determine the weather of a place.

Ans.) The elements that determine the weather of a place are temperature, humidity, rainfall, wind-speed, etc.

### Science Chapter-04: Heat

Question 1:

State the similarities and differences between a clinical thermometer and a laboratory thermometer.

### Science Chapter-06: Physical and Chemical Changes

Question 1:

Mention whether the following processes given below are chemical or physical changes:

(i) Photosynthesis

(ii) Dissolving sugar in water

(iii) The burning of coal

(iv) Melting of wax

### Science Chapter-10: Respiration in Organisms

Q1. Along with rock particles, the soil consists of

(i) Water and air (ii) minerals, air, water and organic matter

(iii) Water and animals (iv) air, plants and water.

### Science Chapter-15: Light

Q1. Complete the sentences by filling the blanks with appropriate words:

(a)___ lens forms an image that cannot be obtained on a screen.

(b) A ___ mirror always forms an image that is of the same size as the object.

(c) A convex ____ always forms an image that is virtual and ____ in size.

### Maths Chapter-07: Congruence of Triangles

1. In quadrilateral ACBD, AC = AD and AB bisects $$\angle$$A . Show that $$\Delta$$ABC $$\cong$$ $$\Delta$$ABD. What can you say about BC and BD?

### Maths Chapter-11: Perimeter and Area

Exercise 1:

Q1. Find

(a) the area of the land

(b) the price of the land,

If the land is of rectangular shape measuring 300 m in length and 400 m in breadth. The cost of 1m2 land is Rs. 10000.

### Maths Chapter-04: Simple Equations

Exercise 4.1

Q-1) Complete the last column of the table.

### Maths Chapter-02: Fractions and Decimals

Exercise 2.1

1) Solve the following

(a) 2-$$\frac{3}{5}$$

### Maths Chapter-12: Algebraic Expressions

Exercise 12.1

Q1: Using arithmetic operations, constants and variables find the algebraic expressions of the cases given below:

(i) Numbers a and b both squared and added.

(ii) Number 5 added to three times the product of s and t.

(iii) One-fourth of the product of numbers m and n.

(iv) One-half of the sum of numbers a and b.

### Maths Chapter-09: Rational Numbers

Exercise 9.1

Q1:

List 9 natural numbers between:

(i) -1 and 0

(ii) -2 and -1

(iii) $$-\frac{4}{5}\; and \;-\frac{2}{3}$$

(iv) $$-\frac{1}{2}\; and \; \frac{2}{3}$$

### Maths Chapter-10: Practical Geometry

Exercise 10.1

Q1:

Draw a line and name it PQ, take a point R outside it. Through R, draw a line parallel to PQ using the ruler and compass only.

### Maths Chapter-08: Comparing Quantities

EXERCISE- 8.1:

QUESTION 1:

Calculate the ratio:

(i) Rs10 to 50 paise (ii) 10kg to 500g

(iii) 60m to 20cm (iv) 20days to 50 hours

### Maths Chapter-13: Exponents and Powers

Exercise-13.1

Q.1.Find the value of:

(i) $$2^{6}$$

(ii) $$9^{3}$$

(iii) $$11^{2}$$

(iv) $$5^{4}$$

### Maths Chapter-14: Symmetry

Exercise-14.1

Q.1. Copy the figures with punched holes and find the axes of symmetry for the following:

### Maths Chapter-15: Visualising Solid Shapes

Exercise-15.1

Q.1. Identify the nets which can be used to make cubes (cut out copies of the nets and try it):

### Maths Chapter-01: Integers

EXERCISE 1.1

Question 1:

The temperature (in degree Celsius) of different places on a particular day is represented using a number line.

### Maths Chapter-03: Data Handling

Exercise 3.1

Question 1:

The following table represents the heights of ten students. Calculate the range of heights.

### Maths Chapter-05: Lines and Angles

Exercise-5.1

Q.1. Find the complementary angle of each of the following angles:

### Maths Chapter-06: The Triangle and its Properties

Exercise 6.1

Question 1:

In ? ABC, X is the midpoint of BC.

AP is _____________

AX is _____________

Is BP = PC?