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Yogita Ingle 5 years, 1 month ago
James Prescott Joule studied the nature of heat and established its relationship to mechanical work. He laid the foundation for the theory of conservation of energy, which later influenced the First Law of Thermodynamics. He also formulated the Joule’s law which deals with the transfer of energy.
Posted by Simran Kaur 5 years, 1 month ago
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Satwik Banerjee 5 years, 1 month ago
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Mass is a measure of the amount of matter in an object. Mass is usually measured in grams (g) or kilograms (kg).
Mass measures the quantity of matter regardless of both its location in the universe and the gravitational force applied to it. An object's mass is constant in all circumstances; contrast this with its weight, a force that depends on gravity.
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Kavanpreet Kaur 5 years ago
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Gaurav Seth 5 years, 1 month ago
PLANT TISSUES |
ANIMAL TISSUES |
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Ribosomes and rough endoplasmic reticulum which are capable of protein synthesis.
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Yogita Ingle 5 years, 1 month ago
Animal tissues are of four types, viz. epithelial tissue, connective tissue, muscular tissue and nervous tissue.
Epithelial Tissue:
The epithelial tissue forms the covering or lining of most of the organs. The cells of epithelial tissue are tightly packed and form a continuous sheet. There is small amount of cementing materials between the cells and no intercellular space is present. Permeability of the epithelial tissue plays a great role in exchange of materials among various organs it also plays an important role in osmoregulation. All epithelial tissues are separated by the underlying tissue by an extracellular fibrous basement membrane.
Connective Tissue:
The cells of a connective tissue are loosely scattered in a matrix. The matrix can be a fluid, jelly like, dense or rigid. The nature of matrix depends on the function a connective tissue serves.
Muscular Tissue:
Muscular tissue is composed of muscle cells. Muscle cells are specialized cells which have the capability to contract and expand. Due to contraction and expansion, muscles facilitate various kinds of movements in the body.
Nervous Tissue:
Nervous tissue makes the nervous system and is composed of specialized cells called neuron. A neuron can be divided into two distinct parts, viz. head and tail. The head is somewhat star-shaped and contains nucleus and some other cell organelles. This is called cyton. There are numerous hair-like outgrowths coming out of the cyton. These are called dendrites. The tail ends in axon terminals. Dendrites receive the nerve impulse, while axon relays the nerve signals.
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Yogita Ingle 5 years, 1 month ago
A cell is defined as the smallest, basic unit of life that is responsible for all of life’s processes.
Functions of Cell
A cell performs these major functions essential for the growth and development of an organism. Important functions of cell are as follows:
Provides Support and Structure
All the organisms are made up of cells. They form the structural basis of all the organisms. The cell wall and the cell membrane are the main components that function to provide support and structure to the organism. For eg., the skin is made up of a large number of cells. Xylem present in the vascular plants is made of cells that provide structural support to the plants.
Facilitate Growth Mitosis
In the process of mitosis, the parent cell divides into the daughter cells. Thus, the cells multiply and facilitate the growth in an organism.
Allows Transport of Substances
Various nutrients are imported by the cells to carry out various chemical processes going on inside the cells. The waste produced by the chemical processes is eliminated from the cells by active and passive transport. Small molecules such as oxygen, carbon dioxide, and ethanol diffuse across the cell membrane along the concentration gradient. This is known as passive transport. The larger molecules diffuse across the cell membrane through active transport where the cells require a lot of energy to transport the substances.
Energy Production
Cells require energy to carry out various chemical processes. This energy is produced by the cells through a process called photosynthesis in plants and respiration in animals.
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Vaporization | Evaporation |
Vaporization is defined as the transitional phase of a compound or an element and it occurs during the boiling or sublimation process. | Evaporation is nothing but a type of vaporization which mostly occurs at temperatures below the boiling point. |
Vaporization can change the state of matter from a solid or liquid to a gas. | During evaporation, the liquid state of matter is turned directly into a gas. |
Vaporization is usually a fast process and requires less amount of energy. | Evaporation is generally a slower process and requires more energy as the molecules have a high tendency to convert into the vapour phase. |
During vaporization, all of the water can turn into gas. | As for evaporation, only the top level of water is turned into gas. |
When vaporization occurs, molecules could come from below the surface when the liquid is boiling. | During evaporation, the molecules vaporize only from the surface of the liquid. |
Posted by Rudra Pratap Nayak 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Lipids are synthesized in Smooth endoplasmic reticulum (SER) and the proteins are synthesized in rough endoplasmic reticulum (RER).
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The body of Amoeba is irregular in shape. The outer covering of the body is the cell membrane. A prominent nucleus lies in the centre surrounded by cytoplasm.
- Structure of amoeba primarily encompasses 3 parts – the cytoplasm, plasma membrane and the nucleus.
- The cytoplasm can be differentiated into 2 layers – the outer ectoplasm and the inner endoplasm
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Antibiotics are useless against viral infections. This is because viruses are so simple that they use their host cells to perform their activities for them. So antiviral drugs work differently to antibiotics, by interfering with the viral enzymes instead.
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Meghna Thapar 5 years ago
Cooked vegetables Salting the water for boiling or blanching vegetables speeds up cooking by hastening the breakdown of hemicelluloses, substances that help hold vegetable fibers together.
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