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Sia ? 6 years, 5 months ago
- The floating seed have density less than that of water.
- Seed have waxy coating which help it to float.
Esha Jain 6 years, 5 months ago
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Posted by Sudhanshu Thakor 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
Brown algae has Chlorophyll a and c.
Red algae on the other hand have chlorophyll a and d.
Posted by Narendra Singh 6 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
Algae are simple plant- like organisms which are usually aquatic in nature.
They contain a cell wall and chlorophyll and can make their own food by photosynthesis.
Algae can be unicellular or multicellular.
Some of the common examples are diatoms, chlamydomonas, and seaweed.
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Lalit Lalit 6 years, 5 months ago
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Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object and thus in contrast to on-site observation, especially the Earth.
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When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action.
Posted by Ayushi Bafna 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Pascal’s law for transmission of fluid pressure states that thepressure exerted anywhere in a confined incompressible fluid is transmitted undiminished and equally in all directions throughout the fluid.
Posted by Rajnesh Kumarmishra 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
Since plastic takes several years to decompose, it is not environment friendly. It causes environmental pollution. Besides, when the synthetic material is burnt it takes a long time to get completely burnt. In the process it release a lot of poisonous fumes into the atmosphere causing air pollution.
Lalit Lalit 6 years, 5 months ago
Posted by Naveen Kumar 6 years, 5 months ago
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Nylon is a synthetic fibre and has some special chemical properties because of which their fibres are strong. There is amide linkage between the monomers of nylon which make their strings extremely strong.
Posted by Samsud Mallick 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
The gases and liquids are called fluids. The friction exerted by fluids on an object fluid friction. The fluid friction is also called drag.
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Yogita Ingle 6 years, 5 months ago
Cell is the fundamental structural and functional unit of all living organisms. Like humans and animals, plants are also composed of several cells.
Posted by Jiya Chadokar 6 years, 5 months ago
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Lalit Lalit 6 years, 5 months ago
Yogita Ingle 6 years, 5 months ago
There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres. These are made of small units that join together to form long chains. Examples of synthetic fibres are rayon, nylon, polyester, acrylic, etc.
Posted by Kanchan Tgh 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Physical properties of metal
- Metals are solid except mercury that is found in liquid state at room temperature.
- They are hard and tough except sodium and potassium that can be cut with a knife.
- They are lustrous i.e. they shine in light because metals possess free electrons that vibrates on getting in contact with light.
- They have high melting points except caesium and gallium have very low melting point.
- They are good conductors of heat and electricity. The best conductors of electricity are silver and copper whereas lead and mercury are comparatively poor conductors.
Physical properties of non-metals
- Non-metals may be either solids, liquids or gases.
- Solid non-metals are brittle and break down into powdery mass on striking with a hammer except diamond which is the hardest non-metal.
- They have a dull luster but iodine is lustorous.
- They have low melting points except diamond that has very high melting point.
- They are poor conductors of heat and electricity except graphite.
- They are not malleable.
- They are not ductile.
- They are not sonorous.
- Examples are carbon, Sulphur, oxygen, phosphorous and many more.
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Posted by Manoj Shrivas 6 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
Types of plastics: Plastics are of two types – thermoplastics and thermosetting plastics.
- Thermoplastics – Thermoplastics get soft when heated and hard again when they are cooled. Example – polythene and poly vinyl chloride. Such plastics are used in making toys, containers, plastic bags, raincoats and combs. Thermoplastics are used in making those articles which do not get too hot, and are flexible.
- Thermosetting plastics – Thermosetting plastics get soft only one, the first time they are heated after being made. When such plastics are heated for the first time, they become soft and can be moulded to make an article of any desired shape. On cooling, the article becomes hard and rigid. Example – Bakelite and melamine. They are used in making handles of cooking utensils, plates, cups, floor tiles, electrical fittings, telephone instruments, etc.
Posted by Manoj Shrivas 6 years, 5 months ago
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Meghna Thapar 5 years, 10 months ago
Types of plastics: Plastics are of two types – thermoplastics and thermosetting plastics.
- Thermoplastics – Thermoplastics get soft when heated and hard again when they are cooled. Example – polythene and poly vinyl chloride. Such plastics are used in making toys, containers, plastic bags, raincoats and combs. Thermoplastics are used in making those articles which do not get too hot, and are flexible.
- Thermosetting plastics – Thermosetting plastics get soft only one, the first time they are heated after being made. When such plastics are heated for the first time, they become soft and can be moulded to make an article of any desired shape. On cooling, the article becomes hard and rigid. Example – Bakelite and melamine. They are used in making handles of cooking utensils, plates, cups, floor tiles, electrical fittings, telephone instruments, etc.
Posted by Manoj Shrivas 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
The outermost Cuticle is a waxy layer that covers the epidermis of some leaves and reduces water loss
Upper and Lower Epidermis are the surface layers of a leaf that protects the inner parts of the leaf. They form the outer layer of the skin
The next layer i.e. Palisade layer contains chloroplasts which are organelles in cells that contain chlorophyll.
There are present spaces of air between the cells.
A layer of loosely arranged cells between the palisade layer and the lower epidermis of the leaf called spongy layer is also present.
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