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

Food moves in the opposite direction during vomiting through the process of anti-peristalsis. The intense pressure formed in the stomach when the food is not accepted by the stomach. The content in the stomach is then pushed back. This returned content is expelled out from the mouth in the form of vomiting.

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Briefly describe the digestion in amoeba with labelled diagram

Posted by Ajay Chaurasiya 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Amoeba is a microscopic unicellular organism. It is found in pond water. It has one or more finger like projections called pseudopodia or false feet for movement and capture of food. Amoeba feeds on some microscopic organisms when it senses food, it pushes around the food particle and engulfs it. The food becomes trapped in a food vacuole. Digestive juices are secreted into the food vacuole. They act on food and break it down into simpler substances. Gradually digested food is absorbed. The absorbed substances are used for growth maintenance and multiplication. The undigested food (residue) is expelled outside by the vacuole.

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Can we Survive by grass or raw leafy vegetables

Posted by Uttaran Borah 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Uttaran Borah 7 years, 4 months ago

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From whera do we get natural fibres

Posted by Keshav Jha 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Natural fibers are obtained from plants and animals; such as jute, cotton, wool, silk, etc.
Natural fibers can be classified into two types – Plant fiber and Animal fiber.
Plant Fiber: Fiber obtained from plants is called plant fiber. For example – cotton, jute, flex, etc.
Animal Fiber: Fiber obtained from animals is called animal fiber. For example: wool and silk.

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what is the role of a leveller in the preparation of soil?

Posted by Anas Saleem 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Sonali Aggarwal 7 years, 4 months ago

Leveller is used to level the soil by pressing it.The levelling of soil prevents the soil from getting blown away by wind or drained off by water.

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Why the clinical thermometer is dipped in an antiseptic solution before use

Posted by Suman Saloni 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

A clinical thermometer is washed with an antiseptic solution before and after use to control the spread of microbes from the thermometer to the patient. After use, the micro-organisms from the patient's mouth can spread to other people and hence washing with an antiseptic is necessary.

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What is polimer

Posted by Arman Malik 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

A polymer is a very big molecule formed by the combination of a large number of small molecules.

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What are reversible and reversible change ?

Posted by Jiya Chauhan 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Jiya Chauhan 7 years, 4 months ago

The change that can be reversed easily by reversing the condition to obtain a substance in its original form is called reversible change . The change that cannot be reversed easily by reversing the condition to obtain a substance in its original form is called irreversible change.

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Average speed

Posted by Adya Jha 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

The average speed of an object is obtained by dividing the total distance travelled by the total time taken.

Average speed = Total distance travelled/Total time taken

If an object travels a distance s in time t then its speed v is, v = s/t.

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What is nutrition and nutrients

Posted by Ranvir Singh 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Jiya Chauhan 7 years, 4 months ago

The various components of food like proteins, carbohydrates,fats,vitamins and minerals these are called nutrients. Nutrition is the process of taking food by an organism and its digestion,absorption and utilisation by the body.

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The main steps of nutritions in human are ...... ,.....,....,.....,and.......

Posted by Amarjeet Jat 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Prescott Telengsing 7 years, 4 months ago

Ingestion,digestion absorption,assimitation and egestion.

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Name a property which is common to the metals occurring near the bottom of the reactivity series

Posted by Amit Kumar 7 years, 4 months ago

CBSE > Class 07 > Science

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Why do farmers rotate their crops? Biology

Posted by A D 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

The practice of growing a series of different types of crops in the same area in sequenced seasons is called as crop rotation. Farmers perform crop rotation as it helps in reducing soil erosion and increases soil fertility and crop yield.

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What do you mean by weaving

Posted by M S K Prathiba 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Kshitiz Srivastava 7 years, 4 months ago

Weaving involve the making of fibre from yarn

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What is mulbery

Posted by Adarsh Kumar 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Basant Pandey 7 years, 4 months ago

Mulberry is a leaf which is been eaten by caterpillar contionuisly about 8 weeks to grow and make a ciciob around them

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In which direction does the heat normally take place

Posted by Hemant Thakur 7 years, 4 months ago

CBSE > Class 07 > Science

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If a piece of chapati is chewed for some time it tasted sweeter . Why?

Posted by Misari Hinsu 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Asmita Gudadhe 7 years, 4 months ago

While chewing chapatis for some time, saliva mixed with chapati which is resulted in to formation of sugar and it becomes sweeter

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what is the bacteria? what are the function of the bacteria

Posted by Sharad Sharma 7 years, 4 months ago

CBSE > Class 07 > Science

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Give rason Toothpastes are alkaline

Posted by Shrish Raj 7 years, 4 months ago

CBSE > Class 07 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

The bacteria present in the mouth produce acids due to the degradation of sugar and food particles after eating. Hence, to prevent tooth decay, the mouth should be rinsed after eating food and toothpastes which are basic should be used for cleaning teeth to neutralise the excess acid.

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agar insan monkey se aaye h to monkey kaha se aaya h

Posted by Adi Pandey 7 years, 4 months ago

CBSE > Class 07 > Science