CBSE > Class 09 > Science | CBSE Board | Homework Help

In some groups of animals, the body cavity is reduced and filled with blood, thus it is called haemocoel.
The animals belonging to phylum Arthropoda and Mollusca have haemocoel.
Haemocoel is the fluid found in the circulatory system of phylum anthropoda.
The open circulatory system involves open body cavities that this liquid occupies freely.

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Why volume of nucleus is very small as compared to the rest of the atom????? Only few have answered this question..... Can you????

Posted by Himani Saini 7 years, 1 month ago

CBSE > Class 09 > Science

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With the help of labeled diagram describe in brief the rurherford's alpha scattering experiment .write any three important conclusion drawn form the experiment

Posted by Gurjinder Singh 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Himani Saini 7 years, 1 month ago

Answer given in ncert no need to put this one

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What do you observe on the filter paper as the water rises on it

Posted by Shristi Somya 7 years, 1 month ago

CBSE > Class 09 > Science

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Define impulse with expression

Posted by Khushi Varu 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sk Kumar 7 years, 1 month ago

If a force of very large magnitude acts on a body for a short period of time is called impulse. I=f × t

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What is the class of monocot and dicot?

Posted by Nikunj Aggarwal 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Nikunj Aggarwal 7 years, 1 month ago

Angiosperm is its phylum

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Smile Sharma 7 years, 1 month ago

they belong to angiosperms

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What is process of diffrenciation?

Posted by V K 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Akanksha Maurya 7 years, 1 month ago

The process of taking up a Permanent shape,size and a function is called differentiation.

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Explain the classification of diseases .what are the different factor responsible for diseases .

Posted by Sushank Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Amrut Dani 7 years, 1 month ago

Acute,chronic,infectious and non-infectious diseases

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Sk Kumar 7 years, 1 month ago

Acute and chronic disease

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Where are genes located in cell

Posted by Hari Krishnan 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Kunal Gupta 7 years, 1 month ago

Genes are located in the nucleus of the cell they are sticked to the chromosomes in the nucleus

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In chapter diversity in living organisms..... Which all organisms, scientific name we have to learn (imp)...name the organism and its scientific name.... please

Posted by Sapna Student 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Himani Saini 7 years, 1 month ago

Cockroach, house fly there name are given in ncert

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Nikunj Aggarwal 7 years, 1 month ago

Human (Homo sappen)

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Prove the 2nd low of neuton

Posted by Arsh Sandhu 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Shubham Bakliwal 7 years, 1 month ago

The rate of change In momemtum is directional prapotional to aplied force until the momentum takes place in the direction of external force is applied

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Adarsh Kumar 7 years, 1 month ago

According to this law,the rate of change in momentum is directly proportional to the external/unbalanced force and change in momentum takes place in the direction of external/unbalnced force.

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Sameer Ansari 7 years, 1 month ago

Second law states that the quantity of motion possed by a body and is given by F=Ma

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What is the diffrence between G and g

Posted by Gyanpati Mishra Gyanpati Mishra 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sk Kumar 7 years, 1 month ago

G is scaler quantity whereas g is vector quantity

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Nikunj Aggarwal 7 years, 1 month ago

g is the acceleration due to gravity

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Adarsh Kumar 7 years, 1 month ago

G is the gravitational force between any two or more object and g is the gravity of earth.G is constant in every place and g changes from place to place.

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Why rabies virus called netrotropic?

Posted by Bhumi Singh 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Palak Gambhir 7 years, 1 month ago

Rabies virus is neurotrophic in nature because from the wound of entry, the rabies virus travels quickly along the neural pathways to the central nervous system.

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Arrange the following substance in incerase order of forces of attraction between the patides water sugar oxygen

Posted by Deepika Sharma 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Akanksha Maurya 7 years, 1 month ago

Oxygen water sugar

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Deepika Sharma 7 years, 1 month ago

Force of attraction are in following order Sugar>warer>oxygen

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Which all organisms ,scientific name we have to study (important)? please name the organism and its scientific name..

Posted by Sapna Student 7 years, 1 month ago

CBSE > Class 09 > Science

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What is bio magnification? Name two heavy metals which when magnified resulted in diseases in humans.

Posted by Huma Khan 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Biomagnification, also known as bioamplification or biological magnification, is the increasing concentration of a substance, such as a toxic chemical, in the tissues of organisms at successively higher levels in a food chain.
1. Lead - High exposure to lead can cause cerebrovascular disease.
2. Arsenic - Arsenic-contaminated groundwater is common in developing countries like Bangladesh. It causes death and disability-adjusted life years (DALYs).

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What is arthematic law abd write its principle

Posted by Lavanya Jain 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Archimedes principle states that the upward buoyant force that is exerted on a body immersed in a fluid whether fully or partially submerged is equal to the weight of the fluid that the body displaces.
Upthrust = Buoyant force = Weight of the displaced fluid.
Applications:

Floating of aquatic animals
Constructionof ships, steemers and boats

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Write 3 difference between mass and weight

Posted by Arati Singh 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Mass	Weight
Mass can never be zero.	Weight can be zero. As in space if no gravity acts upon an object, its weight becomes zero.
Mass is a scalar quantity. It has magnitude.	Weight is a vector quantity. It has magnitude and is directed toward the center of the Earth or other gravity well.
Mass is commonly measured in kilograms and grams.	Weight is commonly measured in Newtons.
Mass doesn’t change according to location.	Weight varies according to location.
The mass may be measured using an ordinary balance.	Weight is measured using a spring balance.

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Lavanya Jain 7 years, 1 month ago

1. Mass is the content inside the object while weight is a force between surface and mass . 2. The S.I.unit of mass is kg whilu weight is Newton 3. Weight =mass * g

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If z=3 then name the element and its valency

Posted by Lavanya Jain 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Himani Saini 7 years, 1 month ago

Lithium it's valency is 1 as it needs to lose only 1 electron to complete its douplet

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Rohit Tiwari 7 years, 1 month ago

Litheium is the element. Its valency is 1.

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Arati Singh 7 years, 1 month ago

It is litheam and its valency is 1

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Which part of the plant cell permits it to withstand very dilute external medium without bursting

Posted by Subarna Paul 7 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Himani Saini 7 years, 1 month ago

It's cell wall not cell membrane

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Tarunya Yadav 7 years, 1 month ago

Plasma membrane

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Rohit Tiwari 7 years, 1 month ago

Plasma membrane

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Lavanya Jain 7 years, 1 month ago

Cell wall

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Amit Chaudhary 7 years, 1 month ago

Cell Wall

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How are cloud forms

Posted by Abhinav Bhardwaj 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Paras Sharma 7 years, 1 month ago

Clouds are formed by the vapoures of water which were vapourised due to evaporation and then condensed by cooling of gases.

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Why does cockroaches have open circulation system

Posted by Harsh Rajawat 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Nikunj Aggarwal 7 years, 1 month ago

Because they do not have a proper circularatary system

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Lavanya Jain 7 years, 1 month ago

Because they are arthopod

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What condesation

Posted by Niket Gupta 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Amit Chaudhary 7 years, 1 month ago

The conversion of state from gaseous state to liquid state.

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1Newton's =5dyne proved that

Posted by Vishesh Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

1 N force is the force which when applied on a 1 kg mass results to an acceleration of 1 m/s² in the body. 1 dyne force is the force which when applied on a 1 gram mass leads to an acceleration of 1 cm/s² in it.

1 kg = 1000 gram and 1 m = 100 cm

1 N = 1(kg)(m/s²)

= (1000 gram)(100cm/s²)

= 10⁵ dyne.

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Newton's first law of motion is called as law of inertia.Justify?

Posted by Manoj Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Newton’s first law of motion states that, a body by itself cannot change its state of rest or of uniform motion. This property of a body is also called inertia.
That is why the Newton’s first law of motion is also called ‘law of inertia’.

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Importance of water

Posted by Nikhil Chavan 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Keshav Lodha 7 years, 1 month ago

The importance of water. The water in our bodies is essential for life. ... Water is involved in every bodily function from digestion and circulation through to the control of body temperature and the excretion of waste products. The water in our bodies is continually being used or lost from the body.

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What is dry ice? How it is prepared

Posted by Sandesh Bajaj 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Nikhil Chavan 7 years, 1 month ago

Dry ice is solid Carbon dioxide also referred to as "Cardice" sometimes When pressure on any gas is increased then the space between the two molecules or atoms gets reduced. The compression of the gas makes it solid. During this process heat energy is released. Carbon dioxide is compressed to get it in solid state.This is called as dry ice. When it comes in contact with any substance it absorbs heat from that substance and forms gas again.

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Coppef is a solid then why it is in the form of thin wires?explain.

Posted by Raj Patel 7 years, 1 month ago

CBSE > Class 09 > Science