CBSE > Class 08 > Science | CBSE Board | Homework Help

No. The earth rotates from west to east on its axis. So, all the stars in the sky (except pole star) appear to move from east to west. With reference to earth, the pole star does not appear to move in the sky because it is located above the axis of rotation of the earth in the north direction. It appears to remain stationary at a point in the sky.

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Which part of the cell is called as selectively permeable and why

Posted by Rajesh Poddar 7 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Harleen Kaur 7 years, 1 month ago

Plasma membrane because it allows certain materials to pass through resisting harmful substances to enter

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Yogita Ingle 7 years, 1 month ago

Plasma membrane called a selectively permeable membrane .
Plasma membrane allows passage to some selected substances. Hence it is called a selectively permeable or semi-permeable membrane.

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What are the physical praperty of metal and non metal????

Posted by Saurabh Kumar 7 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

The following are the physical properties of metal :

The physical properties make them useful for many purposes. For e.g. Copper is used in making electric wires, gold is used to make jewellery, stainless steel is used to make pots, pans, etc
Metals react with nonmetals to form ionic bonds. For e.g. Sodium Chloride (NaCl)
Metals are a good conductor of electricity which means that they can conduct electricity due to the free moving electrons present in them. Copper is used as wiring as it is a good conductor of electricity.
Metals have high melting points and high boiling points as they have strong metallic bonds.
All metals are physically lustrous. They have a lustre that makes them shine. Gold is used for making jewellery.

The following are the properties of Nonmetals :

Nonmetals have high ionization energies.
They have high electronegativities.
Nonmetals are insulators which means that they’re poor conductors of electricity.
They are dull, they do not have lustre like metals.
Nonmetals are poor conductors of heat. They’re poor thermal conductors.
They are very weak and brittle. They tend to easily break or shatter.
Nonmetals have a low density. They’re light for their size.

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During hailing,from where the stones come?

Posted by Akash Tiwari 7 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Laxmi Kumari 7 years, 1 month ago

Aap kaha rahte ho

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Kanchan Bala Sahu 7 years, 1 month ago

During hailing the stone comes because the teampreature of the cloud is more cool and when rains comes it accumulate and the hail come from cloud this is the right answer If you like please thank ???????

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Which bone is the strongest bone in our body??????????

Posted by Anushka Mallick 7 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Pushp Raj 7 years, 1 month ago

इंसान के जांघ की bone पर मुझे नाम नही पता

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Abhishek Kumar 7 years, 1 month ago

Skull

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Saurabh Kumar 7 years, 1 month ago

Skull is the right answer ? and femur is wrong

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Style Miracle 7 years, 1 month ago

Femur

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Inder Rehal 7 years, 1 month ago

Scule

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What is light ?explain the lawss of refection

Posted by Neharika Varshney 7 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Light is a form of energy. It helps in the sense of vision. When light falls on an object, some of the light is reflected back to our eyes. Thus, we are able to see an object because of light being reflected from the object.
Law 1 : The incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.
Law 2 : Angle of incidence is equal to the angle of reflection
Law 3 or Law of Lateral Inversion: In a image formed by a mirror, the left of the object appears to be the right and the right of the object appears to be the right. (Stand in front of the mirror and lift your right hand. In the mirror, it appears like you have lifted the left hand and viceversa)

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State law of reflection?

Posted by Monu Yadav 7 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Nikhil Porwal 7 years, 1 month ago

and the incident ray and the normal at the point of incidence and reflected ray lie on the plain surface

Manure	Fertilizer
Manure is a natural or an organic substance obtained by the decomposition of plant and animal wastes. This is done by microbes, earthworms, fungus etc.	Fertilizer is a synthetic substance or an inorganic compound.
Low percentage of nutrients is present.	High percentage of nutrients is present.
Manure provides a lot of organic matter to the soil. It is slowly absorbed by the plants.	Fertilizer does not provide any humus to the soil. It is quickly absorbed by the plants.
Crop productivity is increased only to some certain extent.	Crop productivity is increased many folds by its use.
No side effects of manure are absorbed.	Chemicals in fertilisers are washed away to the nearby water bodies, causing soil and water pollution.

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