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

Algae are a diverse group of aquatic organisms that have the ability to conduct photosynthesis. Certain algae are familiar to most people; for instance, seaweeds (such as kelp or phytoplankton), pond scum or the algal blooms in lakes.

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Magnesium reacts with steams

Posted by Abhishek Aryan 3 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Manisha Gundlur 3 years, 7 months ago

Magnesium. Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. Very clean magnesium ribbon has a mild reaction with cold water, given below. After several minutes, hydrogen gas bubbles form on its surface, and the coil of magnesium ribbon usually floats to the surface.

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Why is it safer to use mud or timber as a construction material in highly seismic areas?

Posted by Nisha Dube 3 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Suman Sunda 3 years, 7 months ago

That is better because mud and timber have less chances to collapse while heavy construction materials have high chances to collapse.

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What happens to the atmospheric pressure if metrological office,predicts fair weather

Posted by Megha Bauskar 3 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Archana Meena 3 years, 7 months ago

Therefore, as humidity increases (more water vapor in the air), air pressure decreases, and as humidity decreases, air pressure increase.

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milk food item can be produced on a large scale how?

Posted by Virender Kumar 3 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Nikita And Pratik 3 years, 7 months ago

By Animal husbandry . This mean rearing of cows , buffalo on a large scale with proper food ,shelter etc.

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How do weeds affect the growth of planta

Posted by Rudra Patel 3 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Susmita Sadhukhan 3 years, 7 months ago

They absorb nutrients from the ? and water too

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Nikita And Pratik 3 years, 7 months ago

Weed are unusual plant which absorb the nutrients and compete with the crop . So in this way they affect the growth the of plant .

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Nikita Chahar 3 years, 7 months ago

Basically weeds are the unusual plants which grow in feild along with the crop They extract the nutrition from the feild (crop) which affect the growth of plants

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about the hormones

Posted by ꧁༺????????? .?.?.༻꧂ 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Pavan Kumar 3 years, 8 months ago

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Prince Sharma 3 years, 8 months ago

Hormones are chemical substances that act like messenger molecules in the body. After being made in one part of the body, they travel to other parts of the body where they help control how cells and organs do their work. For example, insulin is a hormone that's made by the beta cells in the pancreas.

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Define ingnition temperature

Posted by Ajay Solanki 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Gurmehak Kaur 3 years, 8 months ago

The minimum temperature at which a particular substance burns in the presence of air is called ignition temperature

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Aspirant Aspirant 3 years, 8 months ago

The ignition temperature of a substance is the least temperature at which the substance starts combustion.

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Pavan Kumar 3 years, 8 months ago

The minimum temparature required to burn the substance

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Blackpink .....God 3 years, 8 months ago

Hope it helps Ajay Solanki?

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Blackpink .....God 3 years, 8 months ago

The lowest temperature at which a substance catches fire and undergoes combustion liberating heat and light is called ignition temperature. In other words it is the minimum temperature at which a combustible substance such as air or gas, must be heated up prior to burning in the absence of any source of the heat

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Who are going to be promoted int 9th?

Posted by Nishant Kumar 3 years, 6 months ago

CBSE > Class 08 > Science

2 answers

Suraj Ghughtiyal 3 years, 8 months ago

Me also

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Anushka Soni 3 years, 8 months ago

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ANSWER

The frequency of the male and female voices in human being , are nearly 1kHz and 1.5kHz Which of the two voices- (a)Is likely to be flatter? (b)Has a higher pitch?

Posted by Anushka Soni 3 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Pavan Kumar 3 years, 8 months ago

Female have a high pitch means frequency range is also high yes its likely to flatter

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Satyendra Jamre 3 years, 8 months ago

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Shraddha Jadhav 3 years, 8 months ago

Female voice has higher pitch

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ANSWER

What tpye of laws

Posted by Geetha Jokare 3 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Blackpink .....God 3 years, 8 months ago

There are 2 types of law.The rule of law means is that all laws apply equally to all citizens of the country and no one can be above the law. Neither a government official nor a wealthy person nor even the President of the country is above the law. All persons in independent India are equal before the law.

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Pavan Kumar 3 years, 8 months ago

There are two rules of law That(*)the incidence rays is equal to reflect ray(*)the incidence ray ,normal line ,reflect ray ,point of incidence are lay at the same plane of smooth surface of mirror

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List the function performed by muscular force in our body.

Posted by Atharva Dewade 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Mahek Bansal 3 years, 8 months ago

The muscular system consists of various types of muscle that each play a crucial role in the function of the body. Muscles allow a person to move, speak, and chew. They control heartbeat, breathing, and digestion.

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Kanishka Kava 3 years, 8 months ago

I m himakshi btw

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Kanishka Kava 3 years, 8 months ago

Picking up things and mostly all the work done by our body

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What is wheat

Posted by Suresh Gor 3 years, 8 months ago

CBSE > Class 08 > Science

4 answers

𝑺𝒖𝒓𝒂𝒃𝒉𝒊 𝑺𝒂𝒖𝒎𝒚𝒂 3 years, 7 months ago

Wheat is a Rabi crop .

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Aspirant Aspirant 3 years, 8 months ago

Wheat is a grain. It is grown in winter season.

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Jyoti Sharma 3 years, 8 months ago

Wheat is a type of species

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Profire ㅤ 3 years, 8 months ago

Wheat is wheat only.

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Give any two examples of endemic species.

Posted by Anubhav Shakya 3 years, 8 months ago

CBSE > Class 08 > Science

1 answers

Aspirant Aspirant 3 years, 8 months ago

Asiatic Lion , Gir Forest Kashmir Stag , Kashmir Valley

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Largest planet in solar system

Posted by Amjad Malik 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Profire ㅤ 3 years, 8 months ago

Jupiter

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Suresh Gor 3 years, 8 months ago

Jupiter

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P.Mokshith Kumar 3 years, 8 months ago

Jupiter is the largest planet in the solar system

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Renu Asmitha T 3 years, 8 months ago

Jupiter

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Yugesh Ranganath 3 years, 8 months ago

Jupiter

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Define petrochemicals.

Posted by Shiya ?‍♀️? 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Pavan Kumar 3 years, 8 months ago

The useful substances obtained from petroleum and natural gas are known an petrochemicals. Eg: detergents and synthetic fibres this answer is wrong because the natural gas and the petroleum or obtained by the cried oil

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Geetha Jokare 3 years, 8 months ago

Laws of refelction

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Yugesh Ranganath 3 years, 8 months ago

The useful substances obtained from petroleum and natural gas are known an petrochemicals. Eg: detergents and synthetic fibres

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Seed drill is used for

Posted by Pushpak Jaydeo Parshuramkar 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Suresh Gor 3 years, 8 months ago

For agricultural

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P.Mokshith Kumar 3 years, 8 months ago

A seed drill (also hoe drill; seeder) is a device used in agriculture that sows seeds for crops by positioning them in the soil and burying them to a specific depth. This ensures that seeds will be distributed evenly.

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Mamta Ahuja 3 years, 8 months ago

Sowing

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Nuha Thaha 3 years, 8 months ago

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Jyoti Sharma 3 years, 8 months ago

Seed drill is used for agriculture

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. What are weedicides? Give one example.

Posted by Anshul Yadav 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Sumit Lohra 3 years, 7 months ago

weeds are the unwanted plants that grow naturally along with crops are called weeds . we can control them with help of khurpi or chemicals like 2-4D called weedicides or weeding

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Aspirant Aspirant 3 years, 8 months ago

Weedicides are chemicals used for killing weeds. One example - 2D.

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Parul Thakur 3 years, 8 months ago

The chemical used for killing of weeds are called weedicides

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Divyansh Jain 3 years, 8 months ago

Weeds are the unwanted plants which grow near the plants. They affect the growth of the plants as they take minerals and nutrients from the plant. Weedicides are the chemicals which help in killing weeds. Weeds can also be removed by a khurpi.

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Jyoti Sharma 3 years, 8 months ago

Weeds are the unwanted plants which grow along the main plants and complete with water, minerals, nutrients etc... Examples- Xanthium, fieldbindweed, quack grass etc. Weedicides are the chemicals which help in killing the weeds which acts like a manure

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Name the factors on which shape of the cells depend

Posted by Ruthvik M 3 years, 8 months ago

CBSE > Class 08 > Science

2 answers

Yugesh Ranganath 3 years, 8 months ago

The shape of the cell depends on the cell membrane. Its porous and provides shape and rigidity to cells.

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Jyoti Sharma 3 years, 8 months ago

The shape of the cells depend on the type of work or the function done by them. The shapes may be round, spherical or irregular

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We do not sense any pain when we clip our nail or cut our hair why

Posted by Prasiddha Shetty 3 years, 8 months ago

CBSE > Class 08 > Science

4 answers

Bhoomi Panwar 3 years, 7 months ago

We do not feel any pain because they are made upnof dead cells whereas if u would pull it hair from roots u would get pain Second wale ka answer Bata do

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Suresh Gor 3 years, 8 months ago

Lol because it mad of dead sell

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Jyoti Sharma 3 years, 8 months ago

Because our nails are made up of the dead cells..

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Shruti ? 3 years, 8 months ago

Because they are made up of dead cells

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State electrostatic force? Is it a contact force or a non contact force? (Knowledge )

Posted by Parwinder Singh 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Sumit Lohra 3 years, 7 months ago

It is defined as that when a charge body exert some force on another charge body is called electrostatic forces.

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Gurmehak Kaur 3 years, 8 months ago

The force exerted by a charged body on another charged or uncharged body is known as electrostatic force and it's a non - contact force

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Pavan Kumar 3 years, 8 months ago

The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged body is conventionally known as the electrostatic force. It is also referred to as Columb's force...... And it's non contact force

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Can you store the lemon pickle in an aluminum utensil? Explain

Posted by Tedrick Isaac 3 years, 8 months ago

CBSE > Class 08 > Science

3 answers

Suresh Gor 3 years, 8 months ago

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Jyoti Sharma 3 years, 8 months ago

No, we cannot store the lemon pickle in aluminium utensil because aluminium is a metal and lemon is acidic..

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Bhumika Sharma 3 years, 8 months ago

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What do you mean by deforestation?

Posted by Tedrick Isaac 3 years, 8 months ago

CBSE > Class 08 > Science

5 answers

Aspirant Aspirant 3 years, 8 months ago

Deforestation refers to the decrease in forest areas across the world that are lost for other uses such as agricultural croplands, urbanization or mining activities.

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Parul Thakur 3 years, 8 months ago

Cutting of trees in large scale

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Divyansh Jain 3 years, 8 months ago

Deforestation is a method of cutting down trees and forests of an area is known as Deforestation. Deforestation take happen because the construction of various houses and industries at a place to feed the growing population at the rate of 1.5 % per year. Another reason for Deforestation is due to the extraction of minerals and also due to the natural disasters like tsunamis , volacnic eruptions. This can be controlled by Afforestation. Afforestation is a method of planting more and more trees in a place.

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Jyoti Sharma 3 years, 8 months ago

Cutting down of tress in forests is called deforestation

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Kanishka Kava 3 years, 8 months ago

Cutting down a lot of trees and clearing of forests is known as deforestation

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