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(d) Sandstone.

The secondary rocks are those which are derived from other rocks. The sedimentary rocks are formed from weathering and erosion of igneous, metamorphic and even other sedimentary rocks.

The number of data-items occurring within the limits of a certain class, is called the frequency of that class.

The middle position between the two limits of a class is called the middle value. Adding the two limits of a class and dividing the sum by 2, gives the mid-point of that class.

(c) Upper limit is removed

Correct Answer is: (a) 10

1. Discrete variables 

2. Continuous or indiscrete variables

(d) None of these is true

Inclusive series : Those classes in which variable values equal to both their lower and upper limits are included in the class itself are called inclusive classes. In this method, the upper limit is not left out in any class- interval. This series can be identified by the fact that the upper limit of a class and the lower limit of the next class are not the same.

Exclusive series In this series the upper limit of one class and the lower limit of the next class are the same. In this method of tabulation, the variable values equal to the upper limit of a class are not included in that class, rather they are included in the next class.

(a) Inclusive Series

(a) Individual series

Those variables which can take all the possible values (integer as well as fractional) in a given specified range are termed as continuous variables.

The facts that can be expressed in numerical form, and whose values keep changing, are called variables.

(b) Inclusive Series

Those series in which variable values equal to both their lower and upper limits are included in the class itself, are called inclusive classes. In this method, the upper limit is not left out in any class- interval.

Tabulation is a systematic arrangement of the classified data in to columns and rows of a table.

Variables are the values, whose values change, and classification based on it, is called classification on the basis of variables.

Individual series.

The difference between the upper limit and lower limit in any class is called class interval.

Table No., Title of the table, Headnote/Sub-title, Captions, Stubs, Body of the table, Footnote & Source.

Exclusive method.

Class interval (i) = Upper limit (l₂) – Lower limit (l₁)

The object/Purpose of tabulation are:- 

• It simplifies the complex data 
• To facilitate for comparison 
• To give an identity to the data 
• To reveals trend and patterns of the data

Inclusive method is commonly used for the discrete variables.

Those variables which cannot take all the possible values within a given specified range are termed as discrete variables. They do not have magnitude and their units are indivisible.

Those facts that can be expressed in quantitative terms are called variables, whose value changes continuously. If the height of the students in a classroom is measured, then the height of student will be called a variable.

Difference between discrete and continuous variables : The difference between these two is that there can be any value of the continuous variable. It gradually increases and it is fractional. For example, 2.4, 3.5 or 0-5, 5-10 etc. class-intervals, whereas the discrete variables are always integers, such as 1, 2, 3, 5, 10, 12, etc.

(i) Ethane-1, 2 – dial (ii) Benzene-1, 4-dicarbaldehyde

(iii) 3-Bromobenzaldehyde

LiAlH₄/ NaBH₄/H₂,Pt

NH_3, Δ(heat).

The process by which some plants can reproduce asexually by their vegetative parts like roots, stem and leaves is called vegetative propagation. It has many advantages. Plants raised by vegetative propagation can bear flowers and fruits earlier than those produced from seeds. Plants that have lost the capacity to produce seeds like banana, rose and jasmine can be propagated by this method. All plants produced by this method are genetically similar to the parent plant.

correct option is a.

correct answer is b.

the correct option is C.

correct answer is d.

Explain them the advantages of education, the facilities of reserved seats in government jobs and encourage them to come to school.

(i) 1 will help him in works by bringing water, taking out his books and copies etc. since he is unable to see, speak or walk. 

(ii) I will help him to move from one place to another. 

(iii) I will help the deaf and dumb students to relate them to others.

the correct answer is B.

1. (Louie Braille, six) 

2. (pen, stylus).

The people who cannot see. recognise the letters by touching them with the help of a special script known as the Braille script.

Students should write the answers according to their experience.

Write about successful neighbours who have physical impairments.

The correct answer is 10 : 21 

The length of the line segment = 56 cm

Let the lengths of the two parts be 2x cm and 5x cm.

∴ 2x + 5x = 56

⇒ 7x = 56 = 56/7 = 8

∴ The length of one part is (2 × 8) cm = 16 cm and length of other part is (5 × 8) cm = 40 cm

(1) The poem is about universal brotherhood and establishment of peace. True

(2) We should take arms against each other In times of war. False

(3) Every land is strange and it is difficult to understand their people. False

(4) The kind of labour people do varies from country to country. False

(5) We can achieve strength by means of love and understanding. True

(6) When a war breaks out between nations, it is our mother Earth that we pollute. True

According to the poet, we may appear to be different but we live under the same banner, i.e., humanity. We are attached to this earth. We live here and we will ultimately die here. We all enjoy the same sun, breathe the same air and drink the same water.

‘Uniform’ means a singular identification mark such as dress, costume or colour. But uniform gives rise to differences. Because every nation has a uniform, the world remains divided rather than united.