Indentured labour was a system of bonded labour that was instituted following the abolition of slavery. Indentured labour were recruited to work on sugar, cotton and tea plantations, and rail construction projects in British colonies in West Indies, Africa and South East Asia. An indentured servant or indentured laborer is an employee (indenturee) within a system of unfree labor who is bound by a signed or forced contract (indenture) to work without pay for the owner of the indenture for a period of time. The contract often lets the employer sell the labor of an indenturee to a third party.

Inscriptions and coins have served as  major sources of history in mediaeval India. It is through these inscriptions and coins we could collect some information about various activities and events of the past.Inscriptions help us to know the language prevalent at different places at different time.It is through the study of inscriptions that we came to know about the various political, administrative and religious activities of the past. For example, The pillars of Samudragupta, the edicts of Ashoka etc are examples of inscriptions that throws light on the administration of that time.Some inscriptions discovered the languages used during that period such as Pali, Brahmi, Sanskrit etc.

Coins also help us to know about the economic conditions prevalent at that time.Coins also contained he information about the year of accession, the foreign relations etc.For example, i is through coins that information about the Sultanate and Mughal period came to the focus.The coins of Muhammad-bin- Tughlaq has released information about his rule.

Heterotrophs are the organisms which depend on other organisms for their food. 
Nutrition is the process by which an organism procures its nourishment, the supply of nutrients required by its body and cells to stay alive.Heterotrophs exhibit heterotrophic mode of nutrition. Heterotrophs are the organisms that depend on plants or other organisms for their food. Heterotrophic type of nutrition can be categorized into parasitic mode, saprophytic mode and symbiotic mode of nutrition. 

The substances that taste bitter are called base and their nature is basic. They are slippery to touch. Example: baking soda containing sodium hydrogen carbonate, Milk of magnesia, Soaps, Lime water containing calcium hydroxide, Household cleaners.

The definition of sour is something with an acidic taste, or someone who is resentful or angry. Milk that has gone bad is an example of something that would be described as sour. The unsweetened juice of a lemon is an example of something that would be described as sour. A person with a grumpy and rude personality who is angry all the time is an example of someone who would be described as having a sour personality.

Two triangles are said to be congruent if their sides have the same length and angles have same measure. 
We see many congruent shapes in our day to day life:

• Biscuits of same pack
• Sheets of same letter pad
• Tennis balls of same brand and rare
• Two same mobile phones etc.

The king was told that in order to decide the right time for doing something, it was necessary to look into the future. Since only magicians could do so, he was advised to go to magicians.

Autotrophic nutrition is that mode of nutrition in which an organism makes its own food from the simple inorganic materials like carbon dioxide and water present in the surroundings (with the help of sunlight energy).
Example: Green plants obtain food by autotrophic nutrition.

Carbon and energy requirements of the autotrophic organism are fulfilled by photosynthesis. The process by which green plants make their own food (like glucose) from carbon dioxide and water by using sunlight energy in the presence of chlorophyll is called photosynthesis.

The raw materials for photosynthesis are carbon dioxide and water. The green plants take carbon dioxide from air for photosynthesis. The carbon dioxide gas enters the leaves of the plants through the stomata present on their surface. The water required by the plants for photosynthesis is absorbed by the roots of the plants from the soil through the process of osmosis. The water absorbed by the roots is transported upwards through the xylem vessels to the leaves where it reaches the photosynthetic cells and utilized in photosynthesis.

The conditions for photosynthesis are sunlight, chlorophyll, carbon dioxide and water.

Factors affecting the rate of photosynthesis are (i) Light (ii) Carbon dioxide (iii) Water (iv) Temperature (v) Mineral elements.

The process of photosynthesis takes place in the green leaves of a plant. The carbon dioxide gas required for making food is taken by the plant leaves from the air which enters the leaves through tiny pores called stomata. Water required for making food is taken from the soil which is transported to the leaves from the soil through the roots and the stem. The sunlight provides energy required to carry out the chemical reactions involved in the preparation of food. The green pigment called chlorophyll absorbs sunlight energy.

Democracy, meaning "rule of the people", is a system of government in which the citizens exercise power directly or elect representatives from among themselves to form a governing body, such as a parliament. Consensus democracy – rule based on consensus rather than traditional majority rule. Constitutional democracy – governed by a constitution. Deliberative democracy – in which authentic deliberation, not only voting, is central to legitimate decision making.

Electrical symbols are required to do the electrical drawing and without the help of electrical symbols, we won't be able to do the electrical drawing. Electrical circuits are represented by electrical drawings. Symbols and number combinations are used to represent electrical circuits. An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit.