CBSE > Class 12 > Biology | CBSE Board | Homework Help

Two of the microbes used are Spirulina and Chlorella. These are nutrient rich and that's why they act as food supplement. Also these can be grown in larger amounts in little time.

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What is ecosystem

Posted by Rishi Anand Santanu 8 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Govind Singh 8 years, 2 months ago

An ecosystem includes all of the living things (plants, animals and organisms) in a given
area, interacting with each other, and also with their non-living environments (weather,
earth, sun, soil, climate, atmosphere). Ecosystems are the foundations of the Biosphere
and they determine the health of the entire earth system.

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what are the important diagram for cbse board exams

Posted by Shanu Jha 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Pranjali Mahajan 8 years, 2 months ago

Even reproduction in plants diagrams

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Anushka Tripathi 8 years, 2 months ago

All are important. Specially from human reproduction and evolution.

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Describe briefly about chemical evolution.

Posted by Shivangi Priya 8 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

How sexual reproduction enables organisms to survive during unfavourable conditions?

Posted by Neha Agarwal 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Muskaan Sharma 8 years, 2 months ago

Sexual reproduction permits variation as the progeny is result of fusion of two different germ cells. Characters from both the parents pass on to the progeny. That's why there is better chances of survival even in unfavourable conditions.

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Rishi Anand Santanu 8 years, 2 months ago

Sexual Reproduction is a process which produced young onces through mating between two different ***. The new young onces has more variation than their parant because the character of new young onces is between their parant. So this variation help organism to survive during unfavourable condition

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Why is *** education necessary?

Posted by Susil Naorem 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Anushka Tripathi 8 years, 2 months ago

Good vidhi rawat. Lge rho.

1Thank You

Vidhi Rawat 8 years, 2 months ago

*** education is necessary to give right information to young mind and avoid any myth related to it

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Please home science hindi me kar dizeye

Posted by Kajal Kumari 8 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

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Can someone please give me chapter wise important topics for biology!!

Posted by Ayushi Bose 8 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

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Can anyone suggest me a topic for investigatory project .. biology

Posted by Abc Xyz 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Arjun Gupta 8 years, 2 months ago

BIODIESEL

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Deepshikha Gupta 8 years, 2 months ago

Apiculture

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What is zygote.

Posted by Avinash Kumar 8 years, 2 months ago

CBSE > Class 12 > Biology

0 answers

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Hey guys one suggestion let's share our board viva questions so that all will be prepared and we will know about the level of asking for all the subjects

Posted by Pranjali Mahajan 8 years, 2 months ago

CBSE > Class 12 > Biology

7 answers

Pranjali Mahajan 8 years, 2 months ago

Thank you thankyou?

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Vidhi Rawat 8 years, 2 months ago

Great idea

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Bhumi Jain 8 years, 2 months ago

That's good...from 23 our model exam will start

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Anushka Tripathi 8 years, 2 months ago

Yeah good idea my physics viva on. 23

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Bhumi Jain 8 years, 2 months ago

But in my school practicals will start from 2 feb

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Divya Sen 8 years, 2 months ago

Yeah that's a good idea?

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Bhumi Jain 8 years, 2 months ago

Yes,nice idea

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How Preposita nd preposity are related with each other.

Posted by Anushka Tripathi 8 years, 2 months ago

CBSE > Class 12 > Biology

12 answers

Anushka Tripathi 8 years, 2 months ago

Sorry by mistake is female k/s proposita

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Muskaan Sharma 8 years, 2 months ago

Hey anushka u'v given same term 4 both female n male

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Anushka Tripathi 8 years, 2 months ago

It's from pedigree analysis . The person in family history in which genetic trait first reported is called proband and if this is a male k/s proposity and if female k/s proposity . I got this from Google ?

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Divya Sen 8 years, 2 months ago

As much i remember this word is nowhere in that chapter may be it is about ploidy..

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Bhumi Jain 8 years, 2 months ago

I never heard this word...Would you plzz tell from which ch and pg no. Of NCERT book it is. So that we can also get....

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Pranjali Mahajan 8 years, 2 months ago

What is this related to

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Anushka Tripathi 8 years, 2 months ago

From genetics. And not out of. Course

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Anushka Tripathi 8 years, 2 months ago

From genetics. And not out of. Course

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Bhumi Jain 8 years, 2 months ago

I think it is out of course

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Muskaan Sharma 8 years, 2 months ago

Will u make me know from which chap is it?

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Bhumi Jain 8 years, 2 months ago

I don't know

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Anushka Tripathi 8 years, 2 months ago

Anyone know this.....

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Hlo everyone whatsup guys . How ur preparation going on .

Posted by Anushka Tripathi 8 years, 2 months ago

CBSE > Class 12 > Biology

6 answers

Muskaan Sharma 8 years, 2 months ago

U r ri8... aise v koi dates set krta hai kya....

1Thank You

Anushka Tripathi 8 years, 2 months ago

Board has not given more prep days for physics.

1Thank You

Bhumi Jain 8 years, 2 months ago

Same here??

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Anushka Tripathi 8 years, 2 months ago

Mee too but I m worried for physics

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Bhumi Jain 8 years, 2 months ago

And yours

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Bhumi Jain 8 years, 2 months ago

Nice

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What's the ploidy of aleurone layer of monocot seed?

Posted by Muskaan Sharma 8 years, 2 months ago

CBSE > Class 12 > Biology

5 answers

Abc Efg 8 years, 2 months ago

Aleurone layer is the outermost layer of the endosperm which is triploid.Endosperm is the product of triple fusion (one male nucleus with two female nuclei).

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Bhumi Jain 8 years, 2 months ago

Hmm i am sure

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Muskaan Sharma 8 years, 2 months ago

R u sure bhoomi???

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Bhumi Jain 8 years, 2 months ago

Because the aleurone layer is the outermost layer of the endosperm. Therefore it is also triploid and same as the ploidy of endosperm.

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Bhumi Jain 8 years, 2 months ago

I think triploid

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Uses of Terylene(Dacron)

Posted by Bhumi Jain 8 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Divya Sen 8 years, 2 months ago

It is used for making plastic bottles and also in textile industries for making clothes.

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What do you mean by L.H surge

Posted by Bhumi Jain 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Divya Sen 8 years, 2 months ago

It also causes gradual increase in estrogen.

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Divya Sen 8 years, 2 months ago

LH refers to leutinizing hormones it is produced by gonadotrophic cells in pituitary gland,it ensures ovulation and development of corpus luteum.

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What makes alkali metal halides sometimes coloured which are otherwise colourless

Posted by Bhumi Jain 8 years, 2 months ago

CBSE > Class 12 > Biology

1 answers

Abc Efg 8 years, 2 months ago

Alkali metal halides have anionic sites occupied by unpaired electrons. These are called F-centres, and impart colour to the crystals of alkali metal halides. For example, the excess of lithium in LiCl makes it pink.

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Public all over india is very much concered about air quality in large parts of north indi .alarmed by this situation the president velfare association of your loacality organized an awareness programme entitled Bury not burn .they invited you being a biology students to participate. How would you justify your arguement that promote burying and discourage burning

Posted by Yuvi Chandel 8 years, 2 months ago

CBSE > Class 12 > Biology

2 answers

Divya Sen 8 years, 2 months ago

Is this answer ok Yuvi i had myself prepared this answer in my own words.

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Divya Sen 8 years, 2 months ago

Air is essential for respiration in all living organisms but the pollutants cause a very harmful effect on atmosphere.To overcome this problem the biodegradable materials can be put into deep pits in the ground and be left for natural breakdown...as the burning of certain wastes like plastics can be hazardous and emits CO2 and other gases which leads to global warming while by burying the wastes the filled land can be used for other purposes.Hence burying should be preferred rather than burning.

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Citing a lake as an eg of a simple aquatic ecosystem interpret how various function of this ecosystem are carried out. Make a food chaon that is function in this ecosystem

Posted by Kago Denki 8 years, 2 months ago

CBSE > Class 12 > Biology