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When we breathe in, the muscles b/w the ribs contract causing the rib cage to move upward and outward and the diaphragm contracts and moves downward and movement of diaphragm both increase the space in the chest cavity and make it larger. As the chest cavity becomes larger, air is sucked in from outside into the lungs and lungs get filled up with air and expand. When we breathe out the muscles b/w the ribs relax causing rib cage to move downward and inward and the diaphragm relaxes and move upward. This movement of rib cage, and upward movement of diaphragm both deacreases the space in our chest cavity and make it smaller, pushing air out from the lungs.

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What is the diffeerence of Reflection and Refrection

Posted by Only Alam 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Khushbu Garg 6 years, 3 months ago

Reflection=

1. Reflection is when light falls on any surface, and a part of that light is sent back to the same medium.

2. It only involves images

3. The angle of incidence and the angle of reflection are similar in reflection.

4. Light travels to the same medium

5. Found in images / mirrors

Refraction=

1. Refraction usually deforms the image, depending on the angle in which the image hits another plane or surface.

2. It may also involve sound waves other than images.

3. The angle of incidence and the angle of refraction are not similar in refraction.

4. Light travels from one medium to another medium

5. Found in lenses.

Read more on Brainly.in - https://brainly.in/question/5797606#readmore

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Why metal only react with dilute acid

Posted by Riya Jaiswal 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

? Queen ? 6 years, 3 months ago

Metals usually displace hydrogen from dilute acid. Less reactive metal(Cu, Au, Ag ) do not displace hydrogen from dilute acid. Silver and Gold do not react with dilute acid. The metall like Cu, Au, Ag are less reactive then hydrogen.

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Write the formula and then balance the following equation Ferrous sulphate + sodium hydroxide - ferrous hydroxide + sodium sulphate

Posted by Sujal Singh 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

? Queen ? 6 years, 3 months ago

FeSO4 + NaOH → Fe(OH)2 + Na2SO4

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Shreya ... 6 years, 3 months ago

FeSO4 + NaOH -----> Fe(OH)2 + Na2SO4.

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What are the different ways in which glucose is oxidised to provide energy in various organisms? which of these processes provide the maximum energy?

Posted by ? Queen ? 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Breaking down of glucose involves two processes. In the first step, it is broken into three carbon molecules called pyruvate. The pyruvate is further broken down into energy in following different ways in various organisms.
1) Aerobic respiration : In this case pyruvate is broken down into water and carbon dioxide along with release of energy. It commonly occurs in mitochondria of cells.
2) Anaerobic respiration in yeast : In yeast cells during fermentation pyruvate is converted into ethanol and C0₂in the absence of 0₂.
3) Anaeorbic respiration in muscles: Due to lack of oxygen, eg. during vigorous running or exercise, in human muscles, pyruvate is converted to lactic acid.

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Why are all metals not included in reactivity series?

Posted by Vipin Chauhan 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What are the characterstics of carbon and its compound

Posted by Simran Soni 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Differentiate between sensory neuron and motor neuron

Posted by Tanashree Vimalan 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Arjun Choudhary 6 years, 3 months ago

Sensory neuron use to transfer message from receptor to brain whereas motor neuron use to transfer message from brain to effector

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Aadya Singh ? 6 years, 3 months ago

Sensory neurones transmit impulses from the sensory cells or receptors towards the central nervous system (spinal cord and brain) while motor neurons transmit impulses from the central nervous system (spinal cord and brain) towards the muscle cell5 or effectors.

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Which one of the following is the most reactive chlorine florine bromine iodine

Posted by Manas Kherodia 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Tanashree Vimalan 6 years, 3 months ago

Fluorine

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ANSWER

Why do we see the rainbow formation?

Posted by Amisha Agrawal 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 6 years, 3 months ago

A rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.
It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.
Always it formed in the direction opposite to the sun.
To see a rainbow, the sun must behind us and the water droplets falls infront of us.
When a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.
When different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).
The water drops again refracts the different colours, when it comes out from the raindrop.
After leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow.

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Rani Mishra ??? 6 years, 3 months ago

Because of dispersion of light.

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Dinesh Wagh 6 years, 3 months ago

Because ray of sunlight

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ANSWER

What is biodiversity?

Posted by Sanjay Mali 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 6 years, 3 months ago

Biodiversity refers to diverse flora and fauna that exist in a given area. Plants, animals and human beings are interdependent. It is necessary for human beings as we get fresh air, water, food, etc., from them. Thus, the existence of human beings depend on them.

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Aadya Singh ? 6 years, 3 months ago

Biodiversity refers to flora and fauna that exist in a given area.

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why is energy needed for the life processes

Posted by Md Marghoob Alam 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 3 months ago

Energy is needed for life processes because it is needed to work of our body.If energy is not given the person can't do their works.

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Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium ?

Posted by ? Queen ? 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Akshit Arora 6 years, 3 months ago

No it can not be possible because atomic no. Are always in whole no.

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Adi ??? 6 years, 3 months ago

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Ankesh ..?? Ready To My First Fly 6 years, 3 months ago

No it not posdible because every cisecutive element have only 1 unit of gap between them..and it is half

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For the following question two statements are given one leveled assertion A and the other reason R . Select the correct answer to this questions from code (i) (ii) (iii) (iv) as given below : (i) Both A and R are true and R is the correct explanation of A . (ii) Both A and R are true and R is not the correct explanation of A (iii) A is true and R is false (iv) A is false and R is true A: Melting of wax is a chemical change . R: Change of state is not a chemical reaction .

Posted by Swetapadma Dash 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Tanashree Vimalan 6 years, 3 months ago

A is false but R is true

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Adi ??? 6 years, 3 months ago

R is true

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Sahil ??? 6 years, 3 months ago

(iv)A is false R is true

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ANSWER

Explain the structure of human brain

Posted by Biju P 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 6 years, 3 months ago

Human brain is a highly complex organ; which is mainly composed of the nervous tissue. The tissues are highly folded to accommodate a larger surface area in less space. The brain is covered by a three layered system of membranes; called meninges. Cerebrospinal fluid is filled between the meninges. The CSF provides cushion to the brain against mechanical shocks. Furthermore, the brain is housed inside the skull for optimum protection. The human brain can be divided into three regions, viz. forebrain, midbrain and hindbrain.

Parts of Human Brain

Forebrain: It is composed of the cerebrum.
Midbrain: It is composed of the hypothalamus.
Hindbrain: It is composed of the cerebellum, pons and medulla oblongata.

Some main structures of the human brain are explained below.

Cerebrum: The cerebrum is the largest part in the human brain. It is divided into two hemispheres; called cerebral hemispheres.

Functions of cerebrum:

The cerebrum controls the voluntary motor actions.
It is the site of sensory perceptions; like tactile and auditory perceptions.
It is the seat of learning and memory.

Hypothalamus: The hypothalamus lies at the base of the cerebrum. It controls sleep and wake cycle (circadian rhythm) of the body. It also controls the urges for eating and drinking.

Cerebellum: Cerebellum lies below the cerebrum and at the back of the whole structure. It coordinates the motor functions. When you are riding your bicycle; the perfect coordination between your pedaling and steering control is achieved by the cerebellum.

Medulla: Medulla forms the brain stem; along with the pons. It lies at the base of the brain and continues into the spinal cord. Medulla controls various involuntary functions; like hear beat, respiration, etc.

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Differentiate between homozygous and heterozygous

Posted by Biju P 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years, 3 months ago

Homozygous means both the copies of a gene match while heterozygous means that the copies do not match.

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What is visible spectrums

Posted by Deadly Iest 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Deadly Iest 6 years, 3 months ago

What os quantum mechanics

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Aadya Singh ? 6 years, 3 months ago

Only a certain part of electromagnetic spectrum is visible to human eye . This is called visible spectrum.

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How variation is caused in an organism

Posted by Sayeed Anwar 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Prmod Singh 6 years, 3 months ago

Due to DNA

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Manya Shukla 6 years, 3 months ago

The difference in DNA from F1 to F2......so on cause variation in an organism

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H Y 6 years, 3 months ago

Change in DNA of germ cell cause variations due to any environmental condition.

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Give the examples of autoreduction

Posted by Pawan Kumar 6 years, 3 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Why there's only four trophic level in nature

Posted by Sangeeta Rathore 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Gaurav Seth 6 years, 3 months ago

Any food chain has a maximum of only 4 or 5 trophic levels.This is because according to the 10% law of transfer of energy, only 10% of the energy of any organism at a perticular trophic level is available to another organism at the higher trophic level.So, their is very less energy available for the organism at the 4th or the 5th trophic level.

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Biju P 6 years, 3 months ago

Acording to 10%law only 10% of energy is required organism

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Give six uses of acids and base

Posted by Tulshi Suthar 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aayush Kumar 6 years, 3 months ago

1. Used in industries 2. For preparing salt (by neutralisation rxn ) 3. For making soap 4. For making toothpaste 5. For preparing pickles 6. For preparing vinegar

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What is tha value of solar constant??

Posted by Kishan Prajapati 6 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Aadya Singh ? 6 years, 3 months ago

1.4 kW per metre square.

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Aayush Kumar 6 years, 3 months ago

Google baba ki sharan mein jaao

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What is vaccum ???, What is refractive index??

Posted by Raja Ram 6 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years, 3 months ago

The ratio of speed of light in vaccum to the speed of light in a medium is called refractive index of that medium.

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What is the difference between in respiration and breathing

Posted by Shuhavani Harmeet 6 years, 3 months ago

CBSE > Class 10 > Science

4 answers

Prmod Singh 6 years, 3 months ago

In respiration it break the glucose molecule but in breating energy atp break and release CO2.

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Sangam Rajput 6 years, 3 months ago

In respiration :-The respiration is the process in which breaking down if glucose But in breathing :- take o2 and release co2

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Ak Ak 5 years, 11 months ago

gaand mein lund daal dunga

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Mayank Srivastava 6 years, 3 months ago

Bhahut hard

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What is isobars and isotopes?

Posted by Shuhavani Harmeet 6 years, 3 months ago

CBSE > Class 10 > Science

3 answers

Prmod Singh 6 years, 3 months ago

Element having same atomic number but different atomic mass is called isotopes. Element having same atomic mass but different atomic number is called atomic mass

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Deep Singh 6 years, 3 months ago

Element having same atomic number but different atomic mass is called isotopes. Element having same atomic mass but different atomic number is called atomic mass.

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Sangam Rajput 6 years, 3 months ago

Isotopes :- same atomic number but different atomic mass Isobars same atomic mass but different atomic number

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What do you mean by *** hormones and reproduction

Posted by Dhruv Kakkar 6 years, 3 months ago

CBSE > Class 10 > Science