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

It is a common observation in athletes that they breathe faster and deeper than usual even after finishing a race. This is because during the race the leg muscles of athlete have produced extra energy by doing anaerobic respiration. By doing so the athlete is giving back oxygen to the muscles which it could not give at the time of running.

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What do u mean by heat

Posted by Suaihiamlu Kamei 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Salim Deshmukh 6 years, 1 month ago

A form of energy which transfers from a hotter object to a colder object.

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Meghna Thapar 6 years, 1 month ago

Heat is a form of energy which makes a substance hotter.
The temperature of a substance increases when heat is provided to the substance.

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Manoranjan Mohapatra 6 years, 1 month ago

It is a form of energy which makes the substance hotter

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Who is MLA

Posted by Mrunmayee Inamdar 6 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Suaihiamlu Kamei 6 years, 1 month ago

It means the members of legislative assembly

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Rahima Banu 6 years, 1 month ago

MLA -member of legislative assembly representative by the voters?

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Mrunmayee Inamdar 6 years, 1 month ago

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Rajesh Kumar 6 years, 1 month ago

Mla are the ruler

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Pistil

Posted by Rahima Banu 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Sakshi Suhag 6 years, 1 month ago

The female organ of flowers , which receive pollen grain and produce seeds

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How is the heart useful to us

Posted by Krishan Rajesh 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Gaurav Seth 6 years, 1 month ago

The rhythmic beating of the various chambers of the heart maintains the circulation of blood and transport of substances to the different parts of the body, providing oxygen & nutrients to the cells or tissues and removing carbon dioxide and other wastes

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Krishan Rajesh 6 years, 1 month ago

Heart is the most important part of the body it gives blood to the body parts

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True / False The focal length is the distance between the centre of the lens and the pole

Posted by Riddhi Patil 6 years, 1 month ago

CBSE > Class 07 > Science

5 answers

Shivansh Walia 6 years, 1 month ago

Fáľśé

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Suaihiamlu Kamei 6 years, 1 month ago

False

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Vagisha Vats 6 years, 1 month ago

Harsh singh

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Vagisha Vats 6 years, 1 month ago

Plz give the reasons also

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Harsh Singh 6 years, 1 month ago

False

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Describe mechanism of inhaling and exhaling of air in human lumgs.

Posted by Yash Garg 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Breathing involves the movement of the diaphragm and the rib cage. Breathing involves two steps:

During inhalation, ribs move up and outwards and diaphragm moves down. This movement increases space in our chest cavity and air rushes into the lungs. The lungs get filled with air. The muscles between the ribs contract causing the rib cage to move upward and outward.

During exhalation, ribs move down and inwards, while diaphragm moves up to its former position. This reduces the size of the chest cavity and air is pushed out of the lungs. As the chest cavity becomes smaller air is pushed out from the lungs. Take a deep breath. Keep your palm on the abdomen, feel the movement of abdomen.

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Explain how grondwater is recharged

Posted by Adarsh Dwivedi 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Salim Deshmukh 6 years, 1 month ago

Ground water is recharge by seeping of water into the gound.(infiltration)

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Poonam Tiwari 6 years, 1 month ago

Groundwater is recharged by the process of infilteration

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List 5 products we get from forest

Posted by Om Ghagi 6 years, 1 month ago

CBSE > Class 07 > Science

6 answers

Suaihiamlu Kamei 6 years, 1 month ago

Wood, medicine, rubber, honey, fresh air

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Shivansh Walia 6 years, 1 month ago

Forest provides us timber ,mediciens,cotton,wood ,rubber

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Riddhi Patil 6 years, 1 month ago

Forests provide us firewood, honey, gum, rubber and medicines

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Pulkit Verma 6 years, 1 month ago

Wood , paper, rubber, sealing wax, medicines

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Sakshi Suhag 6 years, 1 month ago

We get oxygen from plants We get wood from plants We get fruits and vegetables from plants We get medicine from plants We get paper from plants

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Seemon Jain 6 years, 1 month ago

Wood, medicine, paper, gum

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How does a electric bell work ?

Posted by Reshmi Priya 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Sakshi Suhag 6 years, 1 month ago

When current is pass through the circuit the coil act as an electromagnetand attract the iron strip toward it.the hammer act as one of the iron strip striks the gong of the bell to produce a sound . When the electrmagnet pulls the irn strip it also break the circuit and current will stop flowing now the coil no longer act as electromagnet it no longer attract the iron strip due to which iron strip come back to its orignal position

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What is the normal pulse rate of human

Posted by Divy Pandey 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Sakshi Suhag 6 years, 1 month ago

72 to 80 per minute

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Harsh Godha 6 years, 1 month ago

७० to ८०

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Banana is a seedless plant so how will it reproduce??

Posted by Himani Bhanushali 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Ayush Pawar 6 years, 1 month ago

Banana has a seed

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Rahima Banu 6 years, 1 month ago

It is produced by the process of pollination

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Rahima Banu 6 years, 1 month ago

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To study the chemical change

Posted by Aarvi Sonawane 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Those changes in which new substances are formed are called chemical changes. The properties of new substances formed in a chemical changes are entirely different from those of the original substances. Chemical changes are also called as chemical reactions. The chemical changes are permanent changes which can usually not be reversed to form the original substance. Large amount of energy is absorbed or lost during the process.

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What is drip irritation

Posted by Om Mishra 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Sakshi Suhag 6 years, 1 month ago

It is a type of micro irrigation system that has the potential to save water and nutrition by allowing water to drip slowly to the roots of plant either from above the soil surface buried below the surface

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India is country of

Posted by Kalakappa Vkambli 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Suaihiamlu Kamei 6 years, 1 month ago

Unity in diversity

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Soma Sinha 6 years, 1 month ago

Unity in diversity or cultural region

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Kalakappa Vkambli 6 years, 1 month ago

Unity in diversity

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Concave lens

Posted by Gurleen Kaur 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Gurleen Kaur 6 years, 1 month ago

Concave mirror show the image small

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Yogita Ingle 6 years, 1 month ago

Concave lens are also called divergent lens as they expand the light (bend outward) falling on it.
Concave lens do not form real images. They only form virtual images which are always erect and smaller in size

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Kalakappa Vkambli 6 years, 1 month ago

Concave lens having light which is scattered in all direction

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define the following 1. Rectilinear propagation 2. Reflection of light 3. Lateral inversion 4. Dispersion of light

Posted by Nanthini Annamalai 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Rectilinear propagation describes the tendency of Electromagnetic waves (light) to travel in a straight line.
The process of sending back the rays of light which falls on the surface of an object is called reflection of light.
The interchanging of left and right sides of an object with its image is called lateral inversion.
The splitting of light into seven constituent colours is called dispersion of light.

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6 difference between real and virtual image

Posted by Lata Dangi 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Real Image

Virtual Image

i. The image is due to reflection or refraction, when the light arises from an object and converges to a certain point.

ii. The real image can be captured on screen as it is the result of actual intersection of ray of light.

iii.The images are inverted

iv. Converging lens are used to produce the image.

v. Concave mirror is used to produce the image.

i. The image produced when the light arising from an object appears to strike a certain point.

ii. It cannot be captured on a screen as it is the imaginary intersection of ray of light.

iii. The images are erect.

iv. Diverging lens are used to produce the image.

v. A plane mirror or convex mirror is used to produce the image

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What are the steps involve to obtain silk

Posted by Vansh Arora 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

The steps involved to obtain silk are:

i. Raising silkworms & harvesting cocoons.
ii. Thread extraction.
iii. Dyeing.
iv. Spinning.
v. Weaving.

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What is asexual reproduction ?

Posted by Subhransu Panda 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Ayush Pawar 6 years, 1 month ago

It is the mode of reproduction in which plants can give rise to new plants without the help of seeds

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Riddhi Patil 6 years, 1 month ago

New plants are formed without the formation of *** cells, its fusion and fertilisation

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Jaat Gaming 6 years, 1 month ago

The reproduction in which one organisms needed

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What are carnivorous plant?

Posted by Sharita Davi 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Suaihiamlu Kamei 6 years, 1 month ago

Plants that eat insects are called carnivorous or insectivorous

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Himani Bhanushali 6 years, 1 month ago

The animals that eat flesh of other plants are called carnivorous

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Abhinay Kumar 6 years, 1 month ago

Lpl

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What is the difference between convex mirror and concave mirror?

Posted by Bhavya Prajapati 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Suaihiamlu Kamei 6 years, 1 month ago

IDK

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Shilpa Prabhu 6 years, 1 month ago

You donot know

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What is diffrence between sewage and sewerage?

Posted by Bheewani Sinha 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Shabnam Jahan 6 years, 1 month ago

SEWAGE: Sewage is waste water released in by homes , industries , hospital , offices and other user . Sewage is a liquid waste . Most of it is water, which has dissolved and suspended impurities. SEWERAGE: The network of big and small pipes, is called sewer , forming the sewerage

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define Electromagnet according to class 7

Posted by Krisha Thakker 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Sukhpreet Kaur 6 years, 1 month ago

It is a coil behaving like magnet when current passes

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Abhay Yadav 6 years, 1 month ago

When the current flows to the wire the wire behave like magnet is called electro magnet

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Shabnam Jahan 6 years, 1 month ago

The coil behave like a magnet when electric current flows through it. When the electric current is switched off, the coil generally loses its magnetism. Such coil are called electromagnet

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What is.reproduction

Posted by Sunder Pawar 6 years, 1 month ago

CBSE > Class 07 > Science