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

Ask questions which are clear, concise and easy to understand.

Ask Question

Posted by Noddy Chak 6 years, 1 month ago

1 answers

Multiply the Celsius temperature by 1.8 and add 32 to get the Fahrenheit conversion With this method you get the exact temperature conversion degree.

0Thank You

ANSWER

Draw Human excretory system and label

Posted by Anil Kumar 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Manasvi Joshi 6 years, 1 month ago

google it or look in your science book

0Thank You

Yogita Ingle 6 years, 1 month ago

The human respiratory system has the following parts:

i. Kidney: The kidneys filter the wastes which is flushed out of the body as urine and excreta.

ii. Ureter: The ureters transfer liquid waste from the kidneys into the urinary bladder.

iii. Urinary Bladder: The urinary bladder stores the urine until it is finally discharged from the body.

iv. Urethra: The urethra is a carrier of semen (in males) as well as urine for the ultimate discharge out of the body.

2Thank You

ANSWER

What are the drawbacks of waste water treatment plant

Posted by Ritika Garg 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 9 months ago

Disadvantages

Impacts Air Quality

Sewage sludge incineration may impact the surrounding air quality. Combustion of waste materials may result in the production of fine inhalable particles laced with toxic metals. Research has shown that about 78 – 98% of Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb) and Zinc (Zn) remain in the ash. Fly ash are usually controlled via wet scrubbers, electrostatic precipitators, and bag filters.

Release of Dioxins

Sewage sludges may contain significant concentrations of hazardous metals, depending on their origin and the wastewater treatment. These toxic substances can result from incomplete combustion by using deficient technology or operating the incinerator incorrectly. Dioxins are carcinogenic and a serious public health threat.

Mercury Contamination

Mercury that results from incinerating waste occurs mainly via fly ash, bottom ash and filter cake. Almost all mercury compounds are hazardous even at very low concentrations in both aquatic and terrestrial ecosystems.

0Thank You

ANSWER

Where bile is produce and stored ?which component of food does it help in digestion

Posted by Ritu Verma 6 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Manasvi Joshi 6 years, 1 month ago

Bile is produce in liver it help to digest fats

0Thank You

Pratishtha Sikarwar 6 years, 1 month ago

The bile is produced by liver it helps in the digestion of fats

0Thank You

Sameer Bedwal 6 years, 1 month ago

Bile produced in liver.The bile plays an important role in the digestion of fats.

0Thank You

Sanchita Ladda 6 years, 1 month ago

It is produced in liver and stored in gall bladder.it helps in digestion of fats

1Thank You

ANSWER

How is Clayeye soil is usful for plant?

Posted by Taniya Joshi 6 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Pranati Shows 6 years, 1 month ago

Yes it is useful

0Thank You

Nirbhay Sharma 6 years, 1 month ago

Please I love you

1Thank You

Nirbhay Sharma 6 years, 1 month ago

I want to become your's boyfriend

2Thank You

Nirbhay Sharma 6 years, 1 month ago

I love you

2Thank You

ANSWER

CBSE board Guru Nanak Modern School question paper of class 6th 2020

Posted by Bharti Singh 6 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

Why wires of different materials ,lengths and thickness are used for different appliances

Posted by Vanshika Rudkival 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Siddhi Prasad 6 years, 1 month ago

because different type of wire produce different amount of heat

0Thank You

ANSWER

what is onesite sewage

Posted by Siddhi Prasad 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Pranati Shows 6 years, 1 month ago

Bathing, agriculture etc

0Thank You

ANSWER

What is kidney

Posted by Parveen Gupta 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Tulika Kamra 6 years, 1 month ago

The kidneys are two bean-shaped organs in the renal system. They help the body pass waste as urine. They also help filter blood before sending it back to the heart. ... creating hormones that help produce red blood cells, promote bone health, and regulate blood pressure

1Thank You

Yogita Ingle 6 years, 1 month ago

Kidneys are bean-shaped structures located on either side of the backbone and are protected by the ribs and muscles of the back. Each human adult kidney has a length of 10-12 cm, a width of 5-7 cm and weighs around 120-170g.

The kidneys have an inner concave structure. At the centre, there is a notch called hilum through which the blood vessels and nerves enter the organ. Towards the inner surface of the hilum, there is a large funnel-shaped space called renal pelvis with projections called calyces.

1Thank You

Karamveer Singh 6 years, 1 month ago

Kidney is the part of our body which impure the blood

1Thank You

ANSWER

what is the difference between aquifer and groundwater

Posted by Siddhi Prasad 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Lavanya Kumari 6 years, 1 month ago

Aquifer holds the water below the ground water

0Thank You

Karamveer Singh 6 years, 1 month ago

Aquifer is the layer of water and ground water means stored water

2Thank You

Meenakshi Limaye 6 years, 1 month ago

Aquifer is the water present between the rock whereas groundwater is the water which is down most.

2Thank You

ANSWER

Who discovered Mobile phone

Posted by Debadeep Technoblade 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Taniya Joshi 6 years, 1 month ago

MARTIN COOPER

0Thank You

Tulika Kamra 6 years, 1 month ago

Martin cooper

1Thank You

Siddhi Prasad 6 years, 1 month ago

Martin Cooper

1Thank You

ANSWER

Pls test

Posted by Khushi Shrivastava 6 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

Whatis mean by hetrotrophic

Posted by Omraje Dongare 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Tulika Kamra 6 years, 1 month ago

A heterotroph is an organism that cannot produce its own food, instead taking nutrition from other sources of organic carbon, mainly plant or animal matter. In the food chain, heterotrophs are primary, secondary and tertiary consumers, but not producers

0Thank You

Meenu Redhu 6 years, 1 month ago

The living plants cannot prepare their own food is known as hetrotrophic for ex animals humans non-green plantd

2Thank You

Vikash Kumar 6 years, 1 month ago

The living organism which do not prepare their own food called heterotrophs

1Thank You

ANSWER

Calculate the work done by a body when a force of 200N is applied to move it through a distance of 5 m?

Posted by Kushagra Singh 6 years, 1 month ago

CBSE > Class 07 > Science

0 answers

ANSWER

Name any two effect of electric cuttent

Posted by Ragini Sharma 6 years, 1 month ago

CBSE > Class 07 > Science

5 answers

Manasvi Joshi 6 years, 1 month ago

Heating effect and magnatic affect

0Thank You

Leisha Trehan 6 years, 1 month ago

Chemical effect

0Thank You

Amrit Gupta 6 years, 1 month ago

(i) Heating effect of electric current (ii)Magnetic effect of electric current

0Thank You

Vikash Kumar 6 years, 1 month ago

Heating effect of current and magnetic effect of current

1Thank You

Bhumik Sandhu 6 years, 1 month ago

heating effect and magnetic effect

1Thank You

ANSWER

What do you mean by neutralising

Posted by Suaihiamlu Kamei 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meenu Redhu 6 years, 1 month ago

The reaction in which acid and base in the formation of salt and wateer

1Thank You

ANSWER

Types of roots

Posted by Nayana Shah 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Suaihiamlu Kamei 6 years, 1 month ago

Types of roots are tap roots and fibrousroot

0Thank You

Tulika Kamra 6 years, 1 month ago

There are two main types of root systems. Dicots have a tap root system, while monocots have a fibrous root system, which is also known as an adventitious root system. A tap root system has a main root that grows down vertically, from which many smaller lateral roots arise.

0Thank You

ANSWER

Describe different horizontal layers in understorey

Posted by B Deorukhkar 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

The trees in the forests are of different shapes and heights. The branching part of the tree above the stem is called its crown. It is formed of branches and leaves. These crowns are of different types and sizes and form horizontal layers in the forests. The trees that are not as tall as canopy trees, form different layers or tiers under the canopy are called understoreys.

0Thank You

ANSWER

How can a hydrate salt be converted to a anhydrous salt

Posted by تبارك رضا 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Hydrated salt contains water of crystallisation to complete its structure. When a hydrated salt looses its water of crystallisation, it becomes an anhydrous salt.

Example: On strong heating copper sulphate crystals lose all the water of crystallisation and form anhydrous copper sulphate.

0Thank You

ANSWER

Amoba digest its food in

Posted by Sharon Hans Rituhans 6 years, 1 month ago

CBSE > Class 07 > Science

4 answers

Tulika Kamra 6 years, 1 month ago

Food Vacoule

0Thank You

Amrit Gupta 6 years, 1 month ago

Food Vacoule

0Thank You

Jaat Gaming 6 years, 1 month ago

Food vacules

1Thank You

Sameer Bedwal 6 years, 1 month ago

Food vacules

1Thank You

ANSWER

What is cyclone?

Posted by Řæw Måğmã 6 years, 1 month ago

CBSE > Class 07 > Science

3 answers

Vikash Kumar 6 years, 1 month ago

Small low pressure with very high speed wind

0Thank You

Kushagra Singh 6 years, 1 month ago

Cyclone is a very low pressure system with very high speed wind revolving around it . The centre of the cyclone is a calm area and know as the eye of the cyclone

0Thank You

Meenakshi Limaye 6 years, 1 month ago

A cyclone is a large scale air mass that rotates around a strong center of low atmosphic pressure.

1Thank You

ANSWER

What concave lens

Posted by Yuvraj Vighmall 6 years, 1 month ago

CBSE > Class 07 > Science

5 answers

Tulika Kamra 6 years, 1 month ago

concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness

0Thank You

Manisha Lalchandani 6 years, 1 month ago

The lens which is thin in the middle that thick at edges is called concave lens

0Thank You

Sharon Hans Rituhans 6 years, 1 month ago

Concave lance can form real image of sun

1Thank You

Bhumik Sandhu 6 years, 1 month ago

concave mirror form real and inverted image.when any object very close to it they form virtual ,erect and magnified image

0Thank You

Meghna Thapar 6 years, 1 month ago

The lens which is thinner in the middle than at edges is called concave lens.

0Thank You

ANSWER

How can humans manage water more effectively?

Posted by Salim Deshmukh 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

We can conserve the water in many ways. Some of them are:

Turning off the taps while brushing our teeth and shaving.
Repairing immediately the leaking taps.
Not leaving the water running for rinsing while washing the dishes.
Do not wash the vegetables under running water. Instead, wash them in a container filled with water and reuse this water for watering plants.

1Thank You

ANSWER

How are humans formed

Posted by Jahnavi Singh 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

The common ancestor of humans and chimpanzees evolved in different ways to produce the present forms.

Evolution produces more diverse and complex body forms over time, but the newly formed species are not more progressive than the already existing ones. So, it is wrong to say that evolution produces progressive higher forms from lower ones.

All human beings, whether fair skinned or dark skinned, belong to the same species i.e. <i>Homo sapiens </i>that originated in Africa.

The human ancestors gradually migrated from Africa to various parts of the world like Asia, Europe, Australia and America. Thus, they spread to different parts of the Earth and adapted as best as they could to their environmental conditions.

0Thank You

ANSWER

Explain how soil pollution and soil emissions could be prevented

Posted by Neeraj Kumar 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 6 years, 1 month ago

Prevention of soil pollution:

To prevent soil pollution, its causes must be controlled.
Plastics and polythene bags destroy the fertility of soil. Hence, they should be disposed properly and if possible, their use should be avoided.
Some waste products from industries and homes pollute soil. These pollutants should be treated chemically to make them harmless before they are disposed.
Other pollutants of soil include pesticides and insecticides. Therefore, excessive use of these substances should be avoided.

Prevention of soil erosion:

By planting trees.
Checking indiscriminate cutting of trees.

0Thank You

ANSWER

Define time period.

Posted by Harsh Singh 6 years, 1 month ago

CBSE > Class 07 > Science

2 answers

Meena Nindavat 6 years, 1 month ago

The time taken by a pendulum for one to-and- fro movement

0Thank You

Shreya Iyer 6 years, 1 month ago

The time period is the time taken for a pendulum to finish one oscillation(mean position to two extreme positions).

1Thank You

ANSWER

How do mushroom digest its food

Posted by Kavya Singhania 6 years, 1 month ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Mushrooms are fungi, and are usually placed in a Kingdom of their own apart from plants and animals. Mushrooms contain no chlorophyll and most are considered saprophytes. That is, they obtain their nutrition from metabolizing non living organic matter.

1Thank You

ANSWER

What do you mean by canopy

Posted by Anil Mohim 6 years, 1 month ago

CBSE > Class 07 > Science