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

Plant conservation is a broad group of activities which aim to prevent plants from becoming extinct. It includes the direct conservation of wild populations, collections of plants with gardens, education programmes, invasive species control, recovery and restoration work, research programmmes, training.

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What is versatile

Posted by Yogita Yogita 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Shikha Patel 7 years, 7 months ago

Which is able to vaporize....

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what is the xelem

Posted by Indhu Indhu 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Kali Rai 7 years, 7 months ago

The process of transportation water from root to leaves is called xylem. It move upward.

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What is wg

Posted by Daksh Bhardwaj 7 years, 7 months ago

CBSE > Class 08 > Science

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What is non communicable disease

Posted by Anupam Yadav Anupam 7 years, 7 months ago

CBSE > Class 08 > Science

2 answers

S. Manav 7 years, 7 months ago

Hey vinay saini your answer is absolutely wrong non communicable diseases are diseases that are not transmitted for a disease person to a healthy person.

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Priya Bhagoria 7 years, 7 months ago

Microbial diseases that can spread from an infected person to a healthy person through air,water,food and physical contact. e.g.cold and cough,cholera etc.

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You can see stubs are left after harvesting of crops. Find out some eco friendly ways to get rid of stubs instead of burning them

Posted by Yuvraj Ahlawat 7 years, 7 months ago

CBSE > Class 08 > Science

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Newton laws of motion

Posted by Shubham Singh 7 years, 7 months ago

CBSE > Class 08 > Science

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Appropriate definition of an atom and electron

Posted by Palakpreet Gill 7 years, 7 months ago

CBSE > Class 08 > Science

0 answers

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yearly production of cereals and pulses before green revolution after green revolution

Posted by Aditya Pandey 7 years, 7 months ago

CBSE > Class 08 > Science

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What is organic farming

Posted by Deep Nagra 7 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Harsh Raj 7 years, 7 months ago

Organic farming is an alternative system in reaction to rapidl ychanges in agricultural products.

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Harsh Raj 7 years, 7 months ago

Organic farming is an

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Explain the process of reproduction in animals???,

Posted by Navdeep Lubana 5 years, 9 months ago

CBSE > Class 08 > Science

5 answers

S. Manav 7 years, 7 months ago

Navdeep Lubana you are a character less person a bull's **** you eat

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Mehul Ravi 7 years, 7 months ago

Kyon puchh rahe ho

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Mehul Ravi 7 years, 7 months ago

Khud ko pata ho to likho n

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Mehul Ravi 7 years, 7 months ago

Mat batao isko

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Tharun Reddy 7 years, 7 months ago

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Malaria is caused by

Posted by Rahul Singh 7 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Maharnaw Pathak 7 years, 7 months ago

Protozoan parasite called Plasmodium Vivax that lives in female Anopheles mosquito

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Říý@ ?? 7 years, 7 months ago

Protozoa

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Mehul Ravi 7 years, 7 months ago

This desease is caused by female anopheles mosquito

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Vritant Jain 7 years, 7 months ago

Female anopheles mosquito

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A farmer grows wheat year after year. He finds that the yield becomes low. Give one appropriate reason for it.

Posted by Jatin Kumar 7 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Říý@ ?? 7 years, 7 months ago

One type of crop for year after year, makes the soil less fertile. So farmer should use crop rotation

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Mehul Ravi 7 years, 7 months ago

May be he had use fertilisers or pesticides that it makes the soil less fertile and tgen the yild becomes low

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Syed Khabib 7 years, 7 months ago

Because he might be using pesticides and fertilisers that makes the soil less fertile that's why yield becomes low.

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Why it is arguid that excess of fertilizer are harmful to the soil even though it increases crop production?

Posted by Rashmita Raulo 7 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Říý@ ?? 7 years, 7 months ago

For long use of fertiliser makes the soil un fertile. So farmer should use organic manure

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Palakpreet Gill 7 years, 7 months ago

It is harmful to soil by making it porous.

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Mehul Ravi 7 years, 7 months ago

Chemical fertililsers or pesticides are harmful for soil but it increse crop production but after some years the soil become barren and acarpous

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Himanshu Garg 7 years, 7 months ago

Because any chemicals are not good for soil. After some years the soil is infert

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Why is bronze preferred over copper metal for making statues

Posted by Anupriya Singh 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

1. Statues are kept in open environment so they are susceptible to rust/tarnish and detetoriation. Moreover to make statues we need to carve and make some minute structures on them, so it requires to be malleable in nature.
2. To ensure these properties, we use alloys in place of pure metals and most common alloy is Bronze.

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What is synthetic fibre?

Posted by Jatin Ly 7 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Mehul Ravi 7 years, 7 months ago

The chemicals made up of from chemical substance in factories or by human are called synthatic fibre.

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Siya Mishra 7 years, 7 months ago

The fibre that is made by chemical processes is called synthetic fibres

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Krish Gupta 7 years, 7 months ago

The fibre which is made by human by chemical substance is called synthetic fiber

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Jatin Ly 7 years, 7 months ago

The fiber made by chemical substance and the fiber made from man is called synthetic fiber

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Synthetic fibre examle and in which subatance we can see them in saily life

Posted by Anshik Jain 7 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Mehul Ravi 7 years, 7 months ago

Polyster, acylic, nylon , rayon, acetate, spandex, lastex, orlon and kevlar.

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Himanshu Garg 7 years, 7 months ago

Like nylone , rayon

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Give two examples which indicates that nylon fibres are stronger than cotton fibre

Posted by Shivendra Singh 7 years, 7 months ago

CBSE > Class 08 > Science

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What is nucleolus?

Posted by Aritra Goswami 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Divyanshi Goel 7 years, 7 months ago

Nucleolus is a substance which vontain both cytoplasm and nuclear membrane

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Explain digram of petrolium and natural gas deposit ?

Posted by Kartik Bobde 7 years, 7 months ago

CBSE > Class 08 > Science

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Imagine that friction suddenly vanishes. How life wouldbaffected. List ten situations.

Posted by Abhay Yadav 7 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Lohith 8C 5 years, 2 months ago

your are Rupesh naaa

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Lohith 8C 5 years, 2 months ago

1.A PERSON CANNOT WALK.

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Lohith 8C 5 years, 2 months ago

I am lohith

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Lohith 8C 5 years, 2 months ago

haiiii

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What is alage,bacteria,protozoa and fungi

Posted by Chanchal Sharma 7 years, 7 months ago

CBSE > Class 08 > Science

4 answers

Siya Mishra 7 years, 7 months ago

FUNGI: fungi can be unicellular or multicellular. Fungi grow best in dark, humid and moist places. Eg - Rhizopus and Agaricus.

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Siya Mishra 7 years, 7 months ago

PROTOZOA : These are unicellular microorganisms with animal- like characteristics : movement and capturing food. Their habitats include freshwater or saltwater, soil and bodies of other organisms. Eg- Amoeba.

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Siya Mishra 7 years, 7 months ago

ALGAE: These are plant-like autotrophic microorganisms. They can be unicellular or multicellular. Algae are also found in clumps known as colonies. Eg - Nostoc, Volvox. BACTERIA : are the most commonly found unicellular microorganisms. They are found everywhere including oceans and guts of animals. Eg - Lactobacillus.

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Ri Ya 7 years, 7 months ago

Microorganisms

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What could be thereason for melons and pumpkins cracking open while on the plant

Posted by Dpk Mohkar 7 years, 7 months ago

CBSE > Class 08 > Science

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Name a modern method of irrigation which is best suited for water deficient and uneven dry lands

Posted by Bhoomika . 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Richa Sharma 7 years, 7 months ago

Drip System is a modern method of irrigation

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What is bacteria

Posted by Chanchal Sharma 7 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Siya Mishra 7 years, 7 months ago

BACTERIA : are the most commonly found unicellular microorganisms. They are found everywhere including oceans and guts of animals. Eg - Lactobacillus.

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Richa Sharma 7 years, 7 months ago

Bacteria microscopic living organisms usually one - celled they can found everywhere. In cold region in hot region everywhere

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Vinay Sharma 7 years, 7 months ago

Some bacteria and blue green algae present in the soil fix nitrogen from the atmosphere and convert into nitrogenous compounds. Certain bacteria convert compounds of nitrogen present in the soil into nitrogen gas which is released to the atmosphere.

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Write a short note about friendly nature of microbes?

Posted by Anika Roy 7 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Lactobacillus is an example of bacteria. Lactobacillus facilitates conversion of milk into curd.
Yeast causes fermentation of many food items. The process by which sugar solution changes into alcohol due to anaerobic respiration by microbes is called fermentation.
When yeast is added to batter of cake, idli or pakora, there is production of carbon dioxide due to respiration by yeast. Carbon dioxide gas creates bubbles in dough or batter which makes fluffy cakes, breads, idli and dosa.
Fermentation also helps in production of alcohol from fruit juice, sugar cane juice or from cereals. This process is utilized to make wine, beer and other alcohol products.

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What us crop production and managment

Posted by Anjali Sharma 7 years, 7 months ago

CBSE > Class 08 > Science

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What is irrigation?Tell some traditonal and modern irrigation system

Posted by Anjali Sharma 7 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Siya Mishra 7 years, 7 months ago

IRRIGATION : is the supply of water to the crops at appropriate intervals.

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Vinay Sharma 7 years, 7 months ago

(iv) Irrigation : Supply of water to crops at appropriate intervals is called irrigation. Method of Irrigation: (a) Tradition methods of Irrigation: Moat, Chain pump, Dheki, Rahat. (b) Modern methods of Irrigation: Sprinkler system, Drip system.

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Vinay Sharma 7 years, 7 months ago

Some traditional modern irrigation systems are 1- sprinkler system 2- drip irrigation

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