Frank Cce Everyday Science Solutions for Class 7 Science Chapter 24 Summative Assessment 2 are provided here with simple step-by-step explanations. These solutions for Summative Assessment 2 are extremely popular among Class 7 students for Science Summative Assessment 2 Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Frank Cce Everyday Science Book of Class 7 Science Chapter 24 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Frank Cce Everyday Science Solutions. All Frank Cce Everyday Science Solutions for class Class 7 Science are prepared by experts and are 100% accurate.

Page No 281:

Question A.1:

Name the types of vascular tissues present in plants.

Answer:

There are two types of vascular tissues present in plants, viz. xylem and phloem.

Page No 281:

Question A.2:

What is a canopy?

Answer:

In a forest, the branches of trees form an umbrella such that not much sunlight reaches the ground. Such an interlocking, dense umbrella of foliage is known as a canopy.

Page No 281:

Question A.3:

What is scum?

Answer:

The material that floats on top of the clarified water in a sedimentation tank during primary treatment of sewage, is known as scum.

Page No 281:

Question A.4:

Define average speed.

Answer:

Average speed of a body is defined as the total distance travelled by the body over a period of time.
It can be calculated by following formula:

Average speed = Total distance travelledTotal time taken

Page No 281:

Question A.5:

What are primary colours?

Answer:

Primary colours are those from which other colours can be obtained, when mixed in different proportions. Red, green and blue are primary colours.

Page No 281:

Question A.6:

Why do body cells require oxygen?

Answer:

Body cells require oxygen for carrying out the process of respiration. During respiration, body cells use oxygen to break down the food, which gives energy to the cells.

Page No 281:

Question A.7:

Where are nephrons found in human body?

Answer:

Nephrons are found in the kidneys of a human body.

Page No 281:

Question B.1:

What is the function of RBC in human body?

Answer:

Red Blood Cells (RBCs) are a component of blood in the human body, which contain haemoglobin. They are responsible for transporting oxygen from the lungs to each and every cell inside the body. RBCs also transport carbon dioxide from the cells back to the lungs for exhalation.

Page No 281:

Question B.2:

State the laws of reflection.

Answer:

The law of reflection states:

  1. When a ray of light is incident on a plane mirror, it is so reflected that the angle of incidence equals the angle of reflection.
  2. The incident ray, reflected ray and the normal all lie in the same plane.

Page No 281:

Question B.3:

What happens during cellular respiration?

Answer:

During cellular respiration, oxygen is used by the cells to break down food. This then releases water, carbon dioxide and energy. The energy released is used for carrying out life processes.

Page No 281:

Question B.4:

What is meant by solenoid? Where do you make use of a solenoid?

Answer:

A solenoid is an electrical component constructed by winding a long insulated wire in the shape of a tightly packed helix. Solenoids are used in doorbells and magnetic actuators.

Page No 281:

Question B.5:

What is a food web?

Answer:

An interconnected network of food chains, which form a multitude of feeding connections among different organisms of a biotic community is called a food web.
Example: The following diagram shows a food web with many interlinked food chains
.

Page No 281:

Question C.1:

Explain the process of tissue culture.

Answer:

Tissue Culture:

In this method, cells (or tissues) are taken from a plant under sterile conditions. Then, these cells (or tissues) are kept in test tubes containing culture medium. These grow into an undifferentiated mass of tissue known as callus.
 The callus is then transferred to another medium, which induces the formation of plantlets. The plantlets can then be transferred into pots and grown into new plants.

Page No 281:

Question C.2:

What is a simple pendulum? Define oscillation and time period of a simple pendulum.

Answer:


A simple pendulum consists of a small, metallic, solid sphere suspended from a rigid support, such that it is free to oscillate.
Oscillation is the distance travelled by the pendulum from its mean position to one extreme position, then coming back to mean position, then going to the other extreme position, and again coming back to the mean position.
The time taken to complete one oscillation is termed as the time period of the pendulum.

Page No 281:

Question C.3:

How will you prove that light consists of seven colours using Newton's colour disc?

Answer:

We use Newton's colour disc to prove that white light is composed of seven colours.
A Newton's disc has sevens colours, viz., violet, indigo, blue, green, yellow, orange and red on it. When it is rotated with a high angular velocity, the disc appears to be white in colour, thus proving that white light is made up of these seven colours.

Page No 281:

Question C.4:

Write any four uses of concave mirror.

Answer:

Concave mirrors are used in:

  1. focusing sunlight in solar heaters.
  2. shaving mirrors for getting a closer look.
  3. making concave reflectors to focus light in searchlights and automobile headlights.
  4. examination of internal body parts such as ear, nose and teeth by dentists and doctors.



View NCERT Solutions for all chapters of Class 7