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Gaurav Seth 4 years, 9 months ago

Answer:

In human beings, body parts of an adult are present from the time of birth itself. Whereas, in metamorphosis, the parts of the adult are different from those at the time of birth.

ANSWER

How does the pressure in liquids vary with depth and altitude

Posted by Shruti ? 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Shruti ? 4 years, 9 months ago

Anyone please answer

ANSWER

Define an embryo. How is it different from zygote and foetus ?

Posted by Shruti ? 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years, 9 months ago

The term embryo is from Latin work “embryum” which means “that which grows”

Embryo is multicellular

The process of formation of embryo is known as embryogenesis

In medical terms, embryo is known as diploid eukaryote

Zygote	Foetus
It is formed by the fusion of the nuclei of the sperm and egg.	It is the stage of the embryo which nearly resembles a human being.
It is a unicellular structure.	It is a multicellular structure.
Produced after the processes of fertilization.	Produced after the processes of cell division and cell labour division.
In Zygote well-described body are absent.	In Foetus well-described body parts are present.

ANSWER

Drug X, when consumed , can damage the cell of the pituitary gland . How would damage to the pituitary gland affect a person's health ? State two points

Posted by Vipin Verma 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 4 years, 9 months ago

The pituitary gland sits below the brain in a midline pocket or fossa of the sphenoid bone known as the sella turcica, imaginatively named by anatomists because of its likeness to a Turkish horse saddle. Embryologically, anatomically and functionally the human gland is divided into two lobes. The anterior lobe constitutes two thirds of the volume of the gland and the posterior lobe one third. As with all other endocrine glands, symptoms arise as the result of either hypo- or hypersecretion of hormones.

ANSWER

Why handle of screw drivers are made of plastic ?

Posted by Yash Saharan Saharan 4 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Dipal Khatri 4 years, 9 months ago

Handles of screw driwers are made up of plastic because plastic is very bad conductor of heat and electricity. Hope it helps you.

Everything Here 4 years, 9 months ago

because plastic insulates the user's hands from the risk of electric shock—as well as plastic tubing that runs much of the length of the shaft.

Yogita Ingle 4 years, 9 months ago

Plastic or rubber is an insulator which does not allow electric current to pass through it. The handles of the tools like screwdrivers and pliers used by electricians for repair have covering of plastic or rubber so that electric current may not pass through these tools to the body of the electrician to harm him.

Avani Rana 4 years, 9 months ago

Electrician's screwdrivers usually have plastic handles—because plastic insulates the user's hands from the risk of electric shock—as well as plastic tubing that runs much of the length of the shaft.

ANSWER

What is combustion? What are the condition necessary for combustion? Make a labelled diagram of candle flame

Posted by Manish Sharma 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Avani Rana 4 years, 9 months ago

Combustion: Combustion is the scientific word for burning. In a combustion reaction a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat. The products of a combustion reaction are called oxides. The condition necessary for combustion are: (i) Presence of a combustible substance. (ii) Attainment of ignition temperature. (iii) Proper supply of air to provide oxygen.

Gaurav Seth 4 years, 9 months ago

The burning of a substance in the presence of oxygen is defined as combustion.

Conditions necessary for combustion are:

(i) Presence of a combustible substance.

(ii) Attainment of ignition temperature.

(iii) Proper supply of air to provide oxygen.

Structure of flame

A flame consist of three zones.These are Innermost zone,middle zone,outer zone.The three zones of a flame have different colours and different temperature.

ANSWER

Match the column :- a. contraction b. rarefaction c. amplitude d. cochlea e, semi-circular canals i) coiled organ of hearing ii) organs of balance iii) compressed sound waves iv) loudness of sound waves v) expanded sound waves

Posted by Preyasi Jain 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years, 9 months ago

a N S W E R :

a. contraction v) expanded sound waves

b. rarefaction iii) compressed sound waves

c. amplitude iv) loudness of sound waves

d. cochlea i) coiled organ of hearing

e. semi-circular canals ii) organs of balance

ANSWER

What is magnitude ?

Posted by Shruti ? 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Thanks

Preyasi Jain 4 years, 9 months ago

The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.

ANSWER

Which two motions are included in the rolling frition

Posted by Keval Chorada 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years, 9 months ago

For a moving solid body, there are two principal types of friction that act upon it:

The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction.
The other type of friction is sliding friction. In this type of friction, there is a restriction on the body’s movement as only one side of the body is in contact with the surface. Pushing a box across the table is an example of Sliding friction.

Choose the correct answer 1. A force applied on a object can change its (a). State of motion (b). Shape and size (c). Direction of motion (d). All the above. 2. When forces are applied on an object in opposite direction, the effect of force is their (a). Sum (b). Division (c). Difference (d). product 3. The force exciting between two celestial bodies is (a). Contact force (b). Gravitational force (c). Muscular force (d). Frictional force. 4. The physical quantity described by force per unit area is (a). Momentum (b). Work (c). Pressure (d). Energy. 5. Mountaineers carry oxygen cylinder with them due to (a). High atmospheric pressure (b). Constant pressure (c). Moderate pressure (d). Low atmospheric pressure.

ANSWER

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Shruti ? 4 years, 9 months ago

First answer is all of the above

ANSWER

What is binary fission ?

Posted by Shruti ? 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Thanks

Diksha Laniya🐥 4 years, 9 months ago

Fission, in biology, is the division of a single entity into two or more parts and the regeneration of those parts to separate entities resembling the original. The object experiencing fission is usually a cell, but the term may also refer to how bodies,, or split into discrete parts. The fission may be binary fission, in which a single organism produces two parts, or multiple fission, in which a single entity produces multiple parts.

ANSWER

What is RNA?

Posted by Ayush Sharma 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 4 years, 9 months ago

RNA is a ribonucleic acid that helps in the synthesis of proteins in our body. This nucleic acid is responsible for the production of new cells in the human body. It is usually obtained from the DNA molecule.

Diksha Laniya🐥 4 years, 9 months ago

Ribonucleic acid (RNA) is a molecule essential in various biological roles in and of RNA andare. Along with and , nucleic acids constitute one of the four major essential for all known forms of Like DNA, RNA is assembled as a chain of, but unlike DNA, RNA is found in nature as a single strand folded onto itself, rather than a paired double strand. Cellular organisms use (mRNA) to convey genetic information (using the of and denoted by the letters G, U, A, and C) that directs synthesis of specific proteins. Many encode their genetic information using an RNA . A hairpin loop from a pre-mRNA. Highlighted are the (green) and the ribose-phosphate backbone (blue). This is a single strand of RNA that folds back upon itself. Some RNA molecules play an active role within cells by catalyzing biological reactions, controlling or sensing and communicating responses to cellular signals. One of these active processes is, a universal function in which RNA molecules direct the synthesis of proteins on . This process uses (tRNA) molecules to deliver to the ribosome, where (rRNA) then links amino acids together to form coded proteins.

ANSWER

Chapter 9 on science full chapter with solutions please help this problem.

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Prachi Saxena 4 years, 9 months ago

Can you tell me your problem

Prachi Saxena 4 years, 9 months ago

Ok I can help you

Diksha Laniya🐥 4 years, 9 months ago

Tell me

Priyanka Longesha 4 years, 9 months ago

ANSWER

What is menstruation? EXPLAIN

Posted by Sameer Kumar Chhimpa 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years, 9 months ago

Menstruation is the process of the shedding of the uterine lining on a regular monthly basis. It begins at puberty and is the reproductive cycle of the female body. Every month, the uterus prepares itself to receive a fertilised egg. Therefore, the inner lining of the uterus becomes thick and is supplied with blood to nourish the embryo. If the egg is not fertilised, then the lining of the uterus breaks down and gets Released in the form of blood through the ******. This lasts for about two to eight days. This cycle occurs every month and is known as the menstrual cycle.

ANSWER

If a pendulum oscillates 40 times in 4 seconds. What is its time period?

Posted by Priya Kumari 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Diksha Laniya🐥 4 years, 9 months ago

ANSWER Time period =Number of oscillations in time tt=404=0.1 s Frequency =Time period1=10 Hz

Yogita Ingle 4 years, 9 months ago

Time period is defined as the time required to complete one oscillation.

Frequency is defined as the number of oscillations per unit time.

Time = 4 sec. Time Period = (4/40) = 0.1 sec

ANSWER

How to find any product of any two elemnts

Posted by Name Surname 4 years, 9 months ago

CBSE > Class 08 > Science

0 answers

ANSWER

Main differences between acids bases and salts

Posted by Name Surname 4 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Ankit Singh 4 years, 9 months ago

An acid is defined as a substance whose water solution tastes sour, turns blue litmus red and neutralizes bases. A substance is called base if its aqueous solution tastes bitter, turns red litmus blue or neutralizes acids. Salt is a neutral substance whose aqueous solution does not affect litmus. ans

Diksha Laniya🐥 4 years, 9 months ago

Welcome

Name Surname 4 years, 9 months ago

Thanks

Diksha Laniya🐥 4 years, 9 months ago

ANSWER

Why do frogs move to ponds or near water bodies during rainy season?

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Shruti ? 4 years, 9 months ago

During spring or rainy season, frogs and toads move to ponds and slow flowing stream.....When male and female frog comes together female lays hundred of eggs. A layer of jelly holds the egg and protects the egg. After the eggs are laid, male deposit sperms over them. Each sperm swims randomly in water with the help of its long tail. When the sperm and egg come in contact fertilisation occours.....

Diksha Laniya🐥 4 years, 9 months ago

Tell me full and name surname

Name Surname 4 years, 9 months ago

Because....

Yogita Ingle 4 years, 9 months ago

This is because tadpoles require water to survive.

Frogs breathe through their moist skin or by lungs.
However tadpoles breathe through their gills since they grow well in the the habitat which is filled with water.
The rainy season is a season when the frogs breathe.
The Frog lay their eggs which has to form tadpoles.
The tadpoles require water to survive.
As a result frogs move towards the pond during rainy season.

ANSWER

What is a zygote?

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Nandkishor Pardeshi 4 years, 9 months ago

A zygote is an fertillised cell or egg, it can also be defined as the second stage of fertillisation

Yogita Ingle 4 years, 9 months ago

A zygote is a fertilized ovum. The germ cells undergo meiosis to reach a haploid state (n) as part of spermatogenesis and oogenesis. The sperm and the unfertilized ovum reinstates a chromosome set in zygote in a diploid state (2n).

ANSWER

Who discovered microscope Did anyone know ans i know

Posted by Ayush Sharma 4 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Diksha Laniya🐥 4 years, 9 months ago

Hello ayush sharma can you send me a your whatapp no.

Gaurav Seth 4 years, 9 months ago

Microscope is an instrument which has good resolving power and magnification. It is used for studying very small sized objects like cells. The very first microscope was built by Zacharias Janssen in 1590. It was first modified by Galileo and then by Robert Hooke.

Ayush Sharma 4 years, 9 months ago

Robert hook

ANSWER

Which of the following will conduct electricity

Posted by Priyanka Longesha 4 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Priyanka Longesha 4 years, 9 months ago

Thanks

Ayush Sharma 4 years, 9 months ago

Copper aluminium etc.

Diksha Laniya🐥 4 years, 9 months ago

Priyanka Longesha 4 years, 9 months ago

Please

ANSWER

State True or False 1. Both male and female organisms are required for asexual reproduction. 2. External fertilisation takes place in mother's body. 3. Viviparous animals lay eggs. 4. The stage of embryo with identifiable body parts is called foetus. 5. In binary fission the nucleus divides into two parts.

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Shruti ? 4 years, 9 months ago

False , false , true , true

ANSWER

Choose the correct answer 5. The type of asexual reproduction, in which animal reproduces by dividing into two is called (a). Budding (b). Fertilisation (c). Binary fission (d). Cloning

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Shruti ? 4 years, 9 months ago

Binary fission

ANSWER

Choose the correct answer 4. Hydra reproduce through (a). Binary fission (b). Fragmentation (c). Multiple Fission (d). Budding

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Budding

Yogita Ingle 4 years, 9 months ago

Hydra reproduces by the method of budding. A small outgrowth called bud is formed on one side of its body by repetitive mitotic division. This bud gradually grows into a full hydra, developing its mouth and tentacles. The new Hydra detaches itself from its parent and start living as a separate organism.

ANSWER

Choose the correct answer 3. The fusion of a sperm and an ovum is called (a). Ovulation (b). Fertilisation (c). Incubation (d). embedding

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Fertilisation

Yogita Ingle 4 years, 9 months ago

The process of fusion of a sperm with an ovum is called fertilisation.

ANSWER

Choose the correct answer 2. In a mother's womb, the baby develops in the (a). Uterus (b). Ovary (c). Oviduct (d). Stomach

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Uterus

Yogita Ingle 4 years, 9 months ago

The development of fertilised egg takes place in the uterus (womb)

ANSWER

Choose the correct answer 1. Sperms are produced in (a). sperm duct (b). Testis (c). ***** (d). None of these

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Shruti ? 4 years, 9 months ago

Testis

Yogita Ingle 4 years, 9 months ago

The testes produce sperms continuously from the stage of puberty onwards. Sperms from the testis pass through the sperm duct, known as vas deferens.

ANSWER

What is the commercial importance of coal tar?

Posted by Diksha Laniya🐥 4 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Diksha Laniya🐥 4 years, 9 months ago

Hello harsh dev jha hi

Yogita Ingle 4 years, 9 months ago

Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses. It may be applied to the affected area to treat psoriasis and seborrheic dermatitis (dandruff).

Harsh Dev Jha 4 years, 9 months ago

Coal tar is made up by mixing the compounds of coke and coal gas. It is mostly used as a raw material in road formation.It also has a great contribution in medicinal use.

ANSWER

Explain the cause of a friction

Posted by Niyati Mangela 4 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Diksha Laniya🐥 4 years, 9 months ago

Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.

Yogita Ingle 4 years, 9 months ago

Friction is a force that resists the relative motion between two objects or materials. The causes of the resistive force of friction are:

Molecular Adhesion
Surface Roughness
Plowing effect

Gaurav Seth 4 years, 9 months ago

When we try to move one object over another object, the irregularities present on their surface get entangled or locked with one another. The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and give rise to force of friction.

Friction is caused by the interlocking of irregularities in the surface of two objects which are in contact with each other. To move one object over the other ,we have to apply a force to overcome interlocking of the irregularities in their surfaces.

More the roughness of a surface larger is the number of irregularities on its surface and has greater will be the friction does the force of friction.The force friction is greater if very rough surfaces are involved.

ANSWER

What is the main advantage of drip irrigation?

Posted by Shreya Pathak 4 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 4 years, 9 months ago

Drip system

There is network of narrow pipes with small holes in the fields.When water flows through the narrow pipes,it fall drop by drop at the position of roots of the plants.This water is absorbed by the soil in the root zone of the plants and utilised by the plant.There is no wastage of irrigation of water.

Advantages

1)It provides water to plants drop by drop.So water is not wasted at all.

2) It minimises the use of water in agriculture.It is useful in those regions where the availability of water is poor.