a) algebraic equation in one variable
b) variable will have power 1 only

2x − 3 = 9

The practice of surveying became common under the colonial administration.
(i)The British believed that a country had to be properly known before it could be effectively administered.
(ii)By the early nineteenth century detailed surveys were being carried out to map the entire country. In the villages, revenue surveys were conducted.
(iii)The effort was to know the topography, the soil quality, the flora, the fauna, the local histories, and the cropping pattern – all the facts seen as necessary to know about to administer the region. From the end of the nineteenth century, Census operations were held every ten years.
(iv)These prepared detailed records of the number of people in all the provinces of India, noting information on castes, religions and occupation.
(v)There were many other surveys – botanical surveys, zoological surveys, archaeological surveys, anthropological surveys, forest surveys.

•  Ploughs are used for tilling the soil, adding manure and fertilisers and for scraping the soil.
•  Leveller is used to level the soil to prevent it from soil erosion. A plank is used to break the crumbs into fine soil. 
•  Hoe was used for tilling in olden days, but these days we use it only to remove weeds.
•  Cultivator pulled by a tractor, is also used to break the soil.
•  Traditional seed drill contains a funnel-shaped container through which seeds pass and get placed into the soil.
•  Modern seed drills sow seeds at a proper depth and distance, and cover them with a layer of soil.

When the surface area is doubled, keeping the force constant, the pressure will decrease. b] When the force is doubled, keeping the area constant, pressure will increase.

Plants do need food for their survival and they would not wait or depend on others to provide them with food. There is a particular mechanism in plants with which they prepare their food. This mechanism is known as Photosynthesis.
Photosynthesis is a biological process used by plants to prepare food with the help of sunlight water and carbon dioxide. The name photosynthesis is derived from the Greek word ”Photo” meaning light and “Synthesis” meaning connecting together. This means combining together with the help of light energy.

Leaves are made up of small cells which have a tiny structure known as chloroplasts. Each chloroplast contains a green colored pigment  called chlorophyll. Light energy is absorbed by chlorophyll molecules whereas carbon dioxide (CO₂) and oxygen (O₂) enter through the tiny pores of stomata located in the epidermis of leaves.

Oxygen is considered one of the most important by-products of this process on which most of the living organism depend upon. Glucose/Sugar is a form of carbohydrates that is processed during the process of photosynthesis. It is commonly used by green plants in the form of an energy source to produce leaves, fruits, flowers, and seeds. The glucose molecules then combine with each other to develop more complex carbohydrates like cellulose and starch. The cellulose is considered as the structural material that is used in plant cell walls. The overall reaction of photosynthesis process is:

Plants do need food for their survival and they would not wait or depend on others to provide them with food. There is a particular mechanism in plants with which they prepare their food. This mechanism is known as Photosynthesis.
Photosynthesis is a biological process used by plants to prepare food with the help of sunlight water and carbon dioxide. The name photosynthesis is derived from the Greek word ”Photo” meaning light and “Synthesis” meaning connecting together. This means combining together with the help of light energy.

Given that ;

Parallel sides are 1.5 m and 2 m.

Distance between them is 1.2 m.

Here,

a = 1.5 m,

b = 2 m,

h = 1.2 m.

Area of Trapezium = 1 / 2 * ( a + b ) * h

                                = 1 / 2*( 1.5 + 2 )*1.2

                                 = 4.2 / 2

                                = 2.1 m²

Hence, the area of trapezium is 2.1 m²

The additive inverse of   -7/19 is  7/19.
The additive inverse of 21/112 is -21/112 .

Crop is a plant that is grown on a large scale commercially. Pulses, Cereals, Oil seeds, Vegetables & fruits are different types of crop.

There are 2 cropping patterns based on India’s climatic conditions:

• Kharif crops

Crops grown in rainy season are termed as Kharif crops. Examples: Maize, soyabean, sugarcane.

• Rabi crops

Crops grown in winter season are termed as Kharif crops. Examples: Wheat, Gram, Pea