CBSE > Class 07 > Science | CBSE Board | Homework Help

Advantages..it allows to produce new plants quickly. New varities of plants having required characteristics can be developed. The plants grown by this method are exact copies of parent plant. Disadvantage-germs can pas from parent plant to offspring. All plants are vulnerable to same diseases

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How a cyclone is form

Posted by Rishav Jha 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Before the formation of clouds, water takes up heat from the atmosphere to change into vapour. When water vapour changes back to water form as raindrops, this heat released to the atmosphere warms the air around. The air tends to rise and causes a drop in pressure. More air rushes to the centre of the storm. This cycle is repeated. The chain of events ends with the formation of a very low pressure system with very high speed winds revolving around it. It is this weather condition that we call a cyclone. The factors like wind speed, wind direction, temperature and humidity contribute to the development of a cyclone.

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Hitarth Jadiwal 7 years, 1 month ago

Water takes up heat from atmosphere . Then it evaporates and goes up , there it becomes cool and form droplets , and releases heat . This heat air around it . Then hot air moves up so the cool air settle down and it becomes cool . More air rushes to the centre of the storm . This cycle is repeated . This events ends with the formation of low pressure system with high speed winds revolving around it . This weather condition is called a cyclone

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What is the difference of image formed by convex and concave mirror

Posted by Hitarth Jadiwal 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Sonu Kathana 7 years, 1 month ago

Concave lens 1. Concave lens is thinner in the middle and thicker at the edges. 2. Concave lens form virtual and small image. 3. Concave lens cannot be used as magnifying glass. 4. Concave lens is used in spectacles to correct eye defects. Concave lens 1. Convex lens is thicker in the middle and thinker at the edges. 2. Concave lens form virtual erect and magnified image. 3. Convex lens can be used as magnifying glass. 4. Convex lens is used in finsculars telescopes and cameras.

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What is rain water harvesting? Give answer for 2 marks

Posted by Tanvi Shedge 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Damini Goud 7 years, 1 month ago

Rain water which can be used to recharge the ground water is known as rin water harvesting

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Nabajit Paul 7 years, 1 month ago

Most of the water which we get from rainfall just flow away this is a waste of water the water can be used to recharge the ground this is called water harvesting or rainwater harvesting

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Gaurav Seth 7 years, 1 month ago

Rainwater Harvesting is collecting & storing rainwater , which includes activities aimed at:-
:- Harvesting surface and groundwater.
:- Prevention of losses through evaporation & seepage

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draw a diagram in your notebook the symbols to represent the following components of electric circuits connecting wires is switch is off position Bansal switch is on position and battery

Posted by Shrikalp Bhuyar 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Hitarth Jadiwal 7 years, 1 month ago

Draw table 14.1

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Name the type of nutrition found in green plants

Posted by Aman Girsay 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Autotrophic Nutrition: Auto means self and trophos means nourishment. Plants are called autotrophs because they make their food themselves. The making of food for themselves is called the Autotrophic nutrition. Autotrophic nutrition is found in green plants, and in some bacteria.

Heterotrophic Nutrition:The word Heterotrophic is the combination of two words i.e. Hetero + Trophos. Hetero means ‘others’ and ‘trophos’ means nourishment. If organisms depend on others for their food, such a mode of nutrition is called Hetetrophic Nutrition.

Animals cannot make their food themselves. They depend for food upon plants. Therefore, nutrition in animals is called Hetetrophic Nutrition. Animals are known as Heterotrophs.

Saprotrophic Nutrition:The uptake of nutrients by organism from dead and decaying matter in the form of solution is called the saprotrophic nutrition. The organisms which use saprotrophic mode of nutrition are called saprotrophs. For example: fungi.

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Smina Smina 7 years, 1 month ago

Autotrophic mode of nutrition

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Why is magnesium hydroxide used as an antacid

Posted by Smriti Singh 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Smina Smina 7 years, 1 month ago

We tqke an antacid like milk of magnesia to neutalise excess of acid released in stomach

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Geetanand Yadav 7 years, 1 month ago

It neutralise when we add acid to it ,so it is called antacid

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Geetanand Yadav 7 years, 1 month ago

Because it is a base

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Name two elements of water

Posted by Satinder Kaur 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Nabajit Paul 7 years, 1 month ago

Hydrogen and oxygen

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Geetanand Yadav 7 years, 1 month ago

Hydrogen and oxygen

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Define spoonification

Posted by Sanskar Thakur 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Saponification is the hydrolysis of an ester under acidic or basic conditions to form an alcohol and the salt of a carboxylic acid. Saponification is commonly used to refer to the reaction of a metallic alkali (base) with a fat or oil to form soap.

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Geetanand Yadav 7 years, 1 month ago

It is a reaction which you will study in class 10

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What happen when we used permanent magnate in electric bell

Posted by Rishu Kharwar 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Kartikeya Khatri 7 years, 1 month ago

The bell rings continues

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How to convert degree celsius into faranheight

Posted by Izmam Husain 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

In converting the temperature from Celsius to Fahrenheit the formula is F = (9/5)C + 32.

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What are MCB's Give answer for 2 marks

Posted by Tanvi Shedge 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Saanvi Tripathi 7 years, 1 month ago

Miniature circuit breaker

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Ashish Phougat 7 years, 1 month ago

Minature circuit breaker

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Yogita Ingle 7 years, 1 month ago

Miniature Circuit Breakers (MCB)
The problem with the fuses is that whenever overloading occurs the fuse wire melts and it has to be replaced to complete the circuit. This problem is overcome in miniature circuit breakers (MCBs) which are widely used nowadays. MCBs are switches that turn off automatically when there is an overload or a short circuit. After solving the problem in the circuit, the switch can be turned back on, and then the current flows as usual.

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What happen when no platelets in our body

Posted by Shubham Kumar 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Kartikeya Khatri 7 years, 1 month ago

If there are no platelets in blood the blood would not be able to clot

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Yogita Ingle 7 years, 1 month ago

If there are no platelets in the blood, then the blood would not be able to clot. A clot is formed because of platelets. They release blood clotting chemicals at the site of injury. These chemicals form a clot and prevent further bleeding.

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Testing of soil before cultivation is an important factor explain

Posted by Tvessha Gupta 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Kartikeya Khatri 7 years, 1 month ago

Yes, to know the deficenec of nitrogen, phosphorus and to know about. The soil is acidic or basic. To add correct fertilizer in it and to know the soil is suitable for which crop

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Tell me what type of change in photosynthesis

Posted by ✌Shreya✌ Bali 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved:
12H₂O + 6CO₂ + Light → C₆H₁₂O₆ + 6O₂+ 6H₂O
As we can see, water and carbon dioxide combine to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.

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Shagun Aggarwal 7 years, 1 month ago

Chemical change

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What type of change in photosynthesis

Posted by ✌Shreya✌ Bali 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Sumayya Shoaib 7 years, 1 month ago

It is a chemical change

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What is the chemical formula of calamine solution

Posted by ????☺☺☺??? ?? 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Calamine, also known as calamine lotion, is a medication used to treat mild itchiness. This includes from sunburn, insect bites, poison oak, or other mild skin conditions. It may also help dry out skin irritation. It is applied on the skin as a cream or lotion.
Calamine is a combination of zinc oxide and 0.5% ferric oxide (Fe₂O₃). The lotion is produced with additional ingredients like phenol and calcium hydroxide.

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Which plant called parasitic plant

Posted by Saurav Kumar 7 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Parasite (Parasitic Plant): Plants that get their food from other plants by living on them are called parasite. Example; Cuscuta, mistletoe.

Cuscuta is a vine-like plant with yellowish stem. It twines around big trees, like banyan tree. Cuscuta gets nutrition from the tree on which it lives.

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Saurav Kumar 7 years, 1 month ago

That plant depend on other plant for their food are called parasitic plant.

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List 8 products we get from forests

Posted by Arpit Gera 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

1) We get medicines from forests.
2) We get gum from forests.
3) We get wood which is used for many purposes like making furniture, paper etc.
4) We get food for animals from forests.
5) We get sealing wax from forests.
6) We get spices from forests.
7) We get oil from forests.

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What is consumer?

Posted by Trinatha Sahoo 7 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Varun Laddha 7 years, 1 month ago

Consumer is the person for whom the producer produce the product and sells it

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Mithlesh Yadav 7 years, 1 month ago

This is the Q of social

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Amogh Raj 7 years, 1 month ago

Who buy any thing from anywhere is known as consumer

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How to get any lessons question and answers

Posted by Nihal Sharma 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Kajal Kumari 7 years, 1 month ago

What you want to say or ask?

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What is reproductive

Posted by Krish Khatri Krish 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Lionel Messi⚽⚽???? 7 years, 1 month ago

reproductive is to make exact copies of a species to stop extintion of that species

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What is the best way to rainwater harvesting

Posted by Bhavesh B Nair 7 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Bhavesh B Nair 7 years, 1 month ago

Most of the water that we get as rainfall just flows away. This is a waste of precious resource. The rainwater can be used to recharge the ground water. This is known as water harvesting.

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What is meant by deforestation

Posted by Shaikh Shayan 7 years, 1 month ago

CBSE > Class 07 > Science