CBSE > Class 10 > Science | CBSE Board | Homework Help

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

Ask Question

How the traits can be inherited

Posted by Bhumi Nagar 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

Inherited traits

Traits controlled by genes
Passed on from one generation to the next

Natural hair colour, shape of the ear lobe, eye colour and feet shape are examples of Inherited traits

1Thank You

ANSWER

Why is the number of sperms is always more than no of eggs present in females??

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

Because not all the sperm gets to the egg(s). To ensure each egg will be ferrtilized there needs to be more sperm then egg(s). And sperms are motile and they have to compete with one another for their existence. In the end only one sperm fuses with the ova .

2Thank You

ANSWER

Two pink coloured flowers on crossing resulted in 1 red 2 pink and 1 white progeny .the nature of cross will be what

Posted by Rutuja Sugave 6 years ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is synaptic cleft.

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 6 years ago

Synaptic cleft is a part of synapse. The information flows from one neuron to another neuron through synapse. Synapse consist of presynaptic ending (contains nuerotransmitter, mitochondria and other cell organelles), post synatic ending (contain receptor site of nuerotransmitter) and synaptic cleft. Presynaptic neuron and the postsynaptic neuron are separated by a small gap — the synaptic cleft. The synaptic cleft is filled with extracellular fluid.

2Thank You

Shreya ... 6 years ago

It is the the space b/w neurons at a synapse.

4Thank You

ANSWER

In which direction does lymph flow?

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

4 answers

Ankan Maity 6 years ago

Lymph is unidirectional

2Thank You

Honey... ??#Girl 6 years ago

2Thank You

Shreyas Samarth 6 years ago

Hi hny ☺️☺️

3Thank You

Honey... ??#Girl 6 years ago

Lymph flows in One Direction within its own system. This flow is only upward towards the neck.... Hi ?

2Thank You

ANSWER

Mica is matal or non metal

Posted by Vishal Sharma 6 years ago

CBSE > Class 10 > Science

2 answers

Shreyas Samarth 6 years ago

Neither metal nor non metal...

0Thank You

Aadya Singh ? 6 years ago

Mica is a compound which is made up of both metal and non- metal.

3Thank You

ANSWER

Do organisms create exact copies of themselves?

Posted by Vaishnavi Singh 6 years ago

CBSE > Class 10 > Science

1 answers

Aadya Singh ? 6 years ago

Organism can create exact copy of themselves by the mode of asexual reproduction. In sexual reproduction, the new organism which is created by fusion of 2 parents resemble them but it is not an exact identical copy due to genetic variations.

4Thank You

ANSWER

Wgich antigen is found in blood group AB

Posted by Anoop Patel 6 years ago

CBSE > Class 10 > Science

1 answers

Shreyas Samarth 6 years ago

Sugar and RH antigen.

0Thank You

ANSWER

Can anyone explain me laws of Mendel in easiest way?

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

0 answers

ANSWER

Q-Chemical name and formulae of soda ash .

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

6 answers

Unnati Agarwal 6 years ago

I too have complained

0Thank You

Unnati Agarwal 6 years ago

Plz

0Thank You

Ram ? 6 years ago

Did u see man asked yesterday, i have complain it to cbse

0Thank You

Unnati Agarwal 6 years ago

Thats correct ans

1Thank You

Lucifer ? Morningstar? 6 years ago

Explain laws of inheritance in simplest ways.

0Thank You

Lucifer ? Morningstar? 6 years ago

Sodium carbonate (Na2Co3)

1Thank You

ANSWER

Why all chromosomes are in females are x

Posted by Amit Thukran 6 years ago

CBSE > Class 10 > Science

1 answers

Vikas Jha 6 years ago

Because x inactivation is random in normal female the x chromosome inherited from the mother is active in some cells

1Thank You

ANSWER

Most electro positive element from the periodic table ?

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

8 answers

Unnati Agarwal 6 years ago

Hii

0Thank You

Lucifer ? Morningstar? 6 years ago

Hello

0Thank You

Ram ? 6 years ago

0Thank You

Yogender Rana 6 years ago

You should write answer cesium because frencium is radioactive element so we will not write it as answer

0Thank You

Anoop Patel 6 years ago

Francium

0Thank You

Abhinav ? 6 years ago

Hmm..reason..!!

1Thank You

Unnati Agarwal 6 years ago

May be but its Lithium (Li)

2Thank You

Abhinav ? 6 years ago

Cesium??

2Thank You

ANSWER

Editing text

Posted by Yuvaraj Baral 6 years ago

CBSE > Class 10 > Science

1 answers

Pk .. 6 years ago

Ask bro....

1Thank You

ANSWER

Cbse class 10 science answer sheet of sa 1 of 2015 - 2016

Posted by Surender Singh Verma 6 years ago

CBSE > Class 10 > Science

2 answers

Pk .. 6 years ago

Teacher ka help le lo bhai....kaha answer sheet dhund rahe ho.........

1Thank You

??Rupi.... ..?? 6 years ago

It is available on Google

1Thank You

ANSWER

Experiment carbon dioxide necessary for photosynthesis

Posted by Jawed Ansari 6 years ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 6 years ago

Take two healthy potted plants which are nearly the same size. Keep them in a dark room for three days. Now place each plant on separate glass plates. Place a watch-glass containing potassium hydroxide by the side of one of the plants. The potassium hydroxide is used to absorb carbon dioxide. Cover both plants with separate bell-jars. Use vaseline to seal the bottom of the jars to the glass plates so that the set-up is air-tight. Keep the plants in sunlight for about two hours. Pluck a leaf from each plant. Remove the green coloured chlorophyll from the leaves by boiling them in alcohol. Wash the decolourised leaves with water and then pour iodine solution over them. Observe the change in colour of the leaves.

We will find that the leaf from the plant (which was inside the bell jar containing potassium hydroxide which absorbed the carbon dioxide), does not turn blue-black on adding iodine solution showing that no starch is present. So we can conclude that the photosynthesis cannot be carried out without carbon dioxide.

The leaf from the plant (which was inside the other bell jar without potassium hydroxide and so having carbon dioxide in it) turns blue-black on adding iodine solution showing that starch is present in this leaf. From this observation we conclude that photosynthesis (to make starch) takes place in the presence of carbon dioxide.

So this shows that carbon dioxide is necessary for the process of photosynthesis to take place.

0Thank You

Lucifer ? Morningstar? 6 years ago

Co2 is necessary for photosynthesis because it reduces to form glucose

1Thank You

Pk .. 6 years ago

Co2 provide carbon to plant that allow the plant to produce glucose.

1Thank You

ANSWER

How does the embroy get nourishment inside the body?

Posted by Thakur Shab 6 years ago

CBSE > Class 10 > Science

3 answers

Shreyas Samarth 6 years ago

Through placenta

1Thank You

Lucifer ? Morningstar? 6 years ago

The embryo gets nutrition inside the body through mother`body with the help of placenta

1Thank You

Suneel Pathak 6 years ago

From the mother's blood with the help of placenta

2Thank You

ANSWER

How is micelle formed?

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 6 years ago

Micelles: A micelle is an aggregate of surfactant molecules dispersed in a liquid colloid. A typical micelle in aqueous solution forms an aggregate with the hydrophilic "head" regions in contact with surrounding solvent, sequestering the hydrophobic single tail regions in the micelle centre.

0Thank You

Pk .. 6 years ago

By self assembly of amphiphilic molecules.

3Thank You

ANSWER

Pls describe me function of heart?☺️☺️

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

6 answers

Honey... ??#Girl 6 years ago

1Thank You

Shreyas Samarth 6 years ago

Gud mrng suhu

1Thank You

Shreyas Samarth 6 years ago

Good morning

1Thank You

Pk .. 6 years ago

Heart pump the blood throughout the body,supplying oxygen and removing co2 and other wastes from the body cell or tissue.

1Thank You

? Ǫᴜᴇᴇɴ ? 6 years ago

Gud morning

4Thank You

Honey... ??#Girl 6 years ago

Heart k function abhishek s puch

4Thank You

ANSWER

Difference between walking and reflex action?

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

5 answers

Anoop Patel 6 years ago

Wallking is directly controlled by our brain while reflex action is controlled by our spinal cord muleva working is controlled by cerebellum and reflex action is controlled by spinal cord by using reflex arc and working needs posture and equilibrium and it is voluntary action while reflex action is involuntary action

1Thank You

Abhi Lanka 6 years ago

Simply

0Thank You

Anjali Anil 6 years ago

Walking is a voluntary action while reflex is involuntary action. Walking is controlled by our brain (through cerebellum) , while reflex action is controlled by spinal cord . Walking is a slow process, while reflex action is fast and sudden. In walking, reflex arc is not formed whie reflex arc is formed in reflex action

3Thank You

Pk .. 6 years ago

Walking is a voluntary action control by cerebellum of the brain.

3Thank You

Pk .. 6 years ago

Reflex action are sudden involuntary action towards the response of a stimuli .there is no involvement of any part of our brain in this response.

3Thank You

ANSWER

What is the advantage of reproduction through spore formation?

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

17 answers

Pk .. 6 years ago

It involves only one parent.......survive even under unfavourable condition.......easily spread to produce more.

2Thank You

Honey... ??#Girl 6 years ago

Kitna hasta h yaar tu ??lol

3Thank You

Shreyas Samarth 6 years ago

☺️

2Thank You

Honey... ??#Girl 6 years ago

Bye ?

1Thank You

Shreyas Samarth 6 years ago

So bye??

1Thank You

Honey... ??#Girl 6 years ago

Okk

1Thank You

Honey... ??#Girl 6 years ago

0Thank You

Shreyas Samarth 6 years ago

I m feeling sleepy now???

1Thank You

Shreyas Samarth 6 years ago

Mje mt lo mera

1Thank You

Honey... ??#Girl 6 years ago

Shivam ye ajeeb h... Kbhi hsta h kbhi gussa ??

0Thank You

Shreyas Samarth 6 years ago

Kuch to nhi shivam

1Thank You

Shivam Mishra 6 years ago

hii bro kya hua

2Thank You

Honey... ??#Girl 6 years ago

Hasta bhi h gussa bhi... Aajeb H.

1Thank You

Honey... ??#Girl 6 years ago

Bda aajeb h

0Thank You

Shreyas Samarth 6 years ago

☺️☺️

1Thank You

Shreyas Samarth 6 years ago

Question ka ans de??

1Thank You

Honey... ??#Girl 6 years ago

Tu pura assignment utha kr lata h kya raat m?? ???

1Thank You

ANSWER

What factors could lead to the rise of a new species??

Posted by Shreyas Samarth 6 years ago

CBSE > Class 10 > Science

3 answers

Lucifer ? Morningstar? 6 years ago

Mutation,Genetic drift And Natural Selection

1Thank You

Abhi Lanka 6 years ago

Accumilation of genes through years

1Thank You

Anjali Anil 6 years ago

Gentic drift Geographical isolation Variations in gene

1Thank You

ANSWER

Derive total % of carbon in atmoshere .

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

2 answers

Anoop Patel 6 years ago

0.01%

0Thank You

Ram ? 6 years ago

Idiot

1Thank You

ANSWER

The purest allotrope of carbon. (All are pure but the purest )

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

8 answers

Aradhana Singh 6 years ago

Graphite and diamond

0Thank You

Lucifer ? Morningstar? 6 years ago

Diamond

0Thank You

Unnati Agarwal 6 years ago

What Unnati

0Thank You

Ram ? 6 years ago

Unnati

1Thank You

Ram ? 6 years ago

Graphite

0Thank You

Lucifer ? Morningstar? 6 years ago

Coke

0Thank You

Unnati Agarwal 6 years ago

Its C-60

1Thank You

Shreyas Samarth 6 years ago

Coal or diamond

1Thank You

ANSWER

Which is the most electro negative element

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

5 answers

Unnati Agarwal 6 years ago

Hmm F is correct

0Thank You

Unnati Agarwal 6 years ago

Why not

1Thank You

Ram ? 6 years ago

Hi shall we be a friends

0Thank You

Lucifer ? Morningstar? 6 years ago

Fluorine

0Thank You

Ram ? 6 years ago

Fluorine

0Thank You

ANSWER

Name 2 amphoteric oxides .

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

3 answers

Unnati Agarwal 6 years ago

Hmm

0Thank You

Lucifer ? Morningstar? 6 years ago

Zinc oxide and Aluminum oxide

0Thank You

Ram ? 6 years ago

Al2o3,zno

0Thank You

ANSWER

What are the disadvantage of fossil fuels?

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

6 answers

Abhi Lanka 6 years ago

1produces more smoke causing air pollution 2)it may extinct in future due to overuse 3)it may affect the ecosystem

0Thank You

Thakur Shab 6 years ago

Fossil fuels have the following disadvantages: (1)They cause air pollution (2)These are non-renewable sources of energy (3)carbon dioxide produced by burning these fueld

1Thank You

Unnati Agarwal 6 years ago

Non-renewable Contribute to global warming due to the realease of acidic oxides in atmosphere

1Thank You

Shreyas Samarth 6 years ago

Sorry i had said advantage

0Thank You

Lucifer ? Morningstar? 6 years ago

Miminum three points

0Thank You

Shreyas Samarth 6 years ago

To know relations between r predators

0Thank You

ANSWER

Difference between Direct Current and Alternative Current

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

1 answers

Unnati Agarwal 6 years ago

● In AC the magnitude and direction of current reverses rapidly where as in DC it is constant. ● Frequency of AC in india is about 50Hz whereas DC is 0. ● AC is used in electrical household appliances such as electric heater , iron and refrigerators etc. whereas DC cannot be used on a large scale of electricity for household purposes. Is this much sufficient.

3Thank You

ANSWER

Give name and formula of detergent

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science

9 answers

Unnati Agarwal 6 years ago

1Thank You

Lucifer ? Morningstar? 6 years ago

Bihar

0Thank You

Unnati Agarwal 6 years ago

You didn't told me that from which city you belong to Mr. Arjun

2Thank You

Unnati Agarwal 6 years ago

Good night

2Thank You

Lucifer ? Morningstar? 6 years ago

Good night miss Unnati

3Thank You

Abhinav ? 6 years ago

Oh..ha..sorry ..

2Thank You

Unnati Agarwal 6 years ago

Abhinav ek minor mistake h tumhare fomulae mein C6H6 Nahi C6H4 hoga

2Thank You

Lucifer ? Morningstar? 6 years ago

sodium dodecyl benzene sulphonate and has a chemical formula of C18H29NaO3S. This chemical compound has an incredible foaming ability, and can be easily compounded with various other additives.

2Thank You

Abhinav ? 6 years ago

They r the sodium salt of long chain alkyl hydrogen sulpahte. Sodium n dodecyl benzene sulphonate is common detergent having formula CH3--(CH2)11--C6H6---SO3-Na+

2Thank You

ANSWER

What is micropropagation? Mentions some advantage.

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

6 answers

Unnati Agarwal 6 years ago

Thanks

1Thank You

Lucifer ? Morningstar? 6 years ago

Yes

0Thank You

Unnati Agarwal 6 years ago

The main advantage of it is the production of many plants that are clones of each other. It is useful in producing disease free plants .

1Thank You

Unnati Agarwal 6 years ago

Abhinav i dont think that your ans is fully correct let Arjun decide ......

1Thank You

Unnati Agarwal 6 years ago

Micropropagation is the practice of rapidly multiplying stock plant material to produce many progeny plants , using modern plant tissue culture methods. Ye sahi ans h naa Mr. Arjun ?

1Thank You

Abhinav ? 6 years ago

It is also known as tissue culture. In plant tissue culture new plants are grown by using living tissues. In this method, small pieces are cut from the plant and then transferred to an artificial nutrient medium where they divide rapidly. This is then transferred to fresh medium containing hormone to grow and differentiate. Advantage<\B> 1.It is possible to produce large no. of plants from single parent. 2. Rapid production of ornamental plants is possible.

2Thank You

ANSWER

Where are coliform bacteria found in human beings . Easy h and imp bhi 1 mark

Posted by Unnati Agarwal 6 years ago

CBSE > Class 10 > Science