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

Let BB-brown eye,,,,,,,,,bb-blue eye,,,,,,,,, Let RR-brown or dark hair,,,,,,,,,rr-red hair,,,,,,, Parents= Man- Bbrr,,,,,,,Woman- bbRr,,,,,,,, 1st child- BbRr,,,,,,2nd child- Bbrr ,,,,3rd child- bbRr ,,,,,4th child- bbrr

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Does some new questions are added in bio like ramsar sites for cbse board 2018 plz tell me fast

Posted by Ankita Kharta 7 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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Does nymphea has endospermic seed

Posted by Priya Patil 7 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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Why xerarch and hydrarch both leads to mesic condition?What is the need?

Posted by Divyank Darshi 7 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

Tanuja Biswas 7 years, 9 months ago

Mesic is one such condition which represents a stable ecosystem ... anything that happens in nature spontaneously....happens so because the end product will bring stability. Hydrarch amd xerarch are not so stable ecosystems as is the mesic one

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Tanuja Biswas 7 years, 9 months ago

Its not that always xerarch and hydrarch will lead to mesic condition.....see wht an ecological succession is what we predict that a certain series of events if occur will lead to a certain result. On the land the ultimate Condition will be a mesic one or else what cn u think of it to be... land will ultimately have a forest on it unless the land is barren..and on barren land like a desert which has meagre amount of water...u cnt expect xerarch or hydrarch succesions to take place. Supposee the these successions during its developing period from one to another seral community faces a natural or human induced disaster say drought or no rains or say we found some mineral there n we start mining ....in those cases ultimate result wont be mesic condition. If a piece of land is having water on it with no other interference of human or natural activity ... naturally over a period of time mesic conditions will cm. U cn imagine how first forests would have evolved on this earth .

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Tehrim Rockstar 7 years, 9 months ago

The climatic changes lead to mesic conditions

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Divyank Darshi 7 years, 9 months ago

No one !

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How many total enzymes work in dna replication

Posted by Tehrim Rockstar 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Divyank Darshi 7 years, 9 months ago

1.Helicase-for opening the helix 2.DNA Polymerase-Polymerises the strands 3.DNA Ligase-joins the discontinously replicated strands 4.Primase-for the formation of primer 5.Topoisomerase-cuts the strand from the point upto which replication fork is replicated

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In carbon cycle burning of fossil fuels and fuelwood release carbon in environment as co2 then why arrow is shown downward in ncert.......

Posted by Tehrim Rockstar 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Tanuja Biswas 7 years, 9 months ago

Dont worry abt that .....we all know that CO2 is released upon burning ...the arrow must be a misprint ...or may be it is pointing to that burning...in exam idea book ...the arrow head is opposite to that of ncert ......main thing is that concept should be clear ...that what are sites of consumption and production of CO2 in the ecosystem.

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Divyank Darshi 7 years, 9 months ago

It is showing that co2 in atmosphere is due to burning of fossil fuels and forests,,it is just pointing towards the burning of tree

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Is syllabus change for 2018-2019 session of all subjects

Posted by Annu Kharb 7 years, 9 months ago

CBSE > Class 12 > Biology

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How endosperm develops

Posted by Dipanshu Bokade 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Divyank Darshi 7 years, 9 months ago

Endosperm develops from primary endosperm nucleus.PEN ,as ovule develops into seed, develops into endosperm.

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In a nucleus the number of RNA nucleoside triphosphate is 10 times more than the number of DNA nucleotides triphosphate, still only DNA nucleotides are added during the DNA replication and not the RNA nucleotides. why?

Posted by Shagun Waraich 7 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

Shagun Waraich 7 years, 9 months ago

Ok thanks guys

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Divyank Darshi 7 years, 9 months ago

Because during replication the enzyme DNA Polymerase uses Deoxyribonucleoside triphosphate as a substrate and also Deoxyribonucleoside triphosphate provides energy for replication

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Tehrim Rockstar 7 years, 9 months ago

Bcoz. Dna ploymerase identifies only dna nucleotides and not rna nucleotides

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Shagun Waraich 7 years, 9 months ago

Does anyone know ?

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Shagun Waraich 7 years, 9 months ago

??...........plzz tell

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Detail of thallophytes

Posted by Anamika Dwivedi 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Japneet Singh 7 years, 9 months ago

Their body is not well differentiated which give them a thallus like structure. Eg's .

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what is "the evil quadret"?

Posted by Bhargavgiri Gosai 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Tehrim Rockstar 7 years, 9 months ago

Clearly mentioned in ncert at pg 264

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In carbon cycle burning of forests fuelwood and debris gives off co2 then why arrow is shown downward...

Posted by Tehrim Rockstar 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Tehrim Rockstar 7 years, 9 months ago

Tell me plz....

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what is histone

Posted by Aditi Shukla 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Lavish Tyagi 7 years, 9 months ago

ncert page no 99 for more........

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Lavish Tyagi 7 years, 9 months ago

set of positively charged basic protein

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important diagrams for boards exams

Posted by Ratnesh Dubey 7 years, 9 months ago

CBSE > Class 12 > Biology

8 answers

Annu Kharb 7 years, 9 months ago

Female reproductive system

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Rida Khan 7 years, 9 months ago

Seminiferous tubules

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Tehrim Rockstar 7 years, 9 months ago

Replication fork.. Antibody..

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Lavish Tyagi 7 years, 9 months ago

male or female reproductive system.......etc

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Lavish Tyagi 7 years, 9 months ago

human pedigree analysis

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Lavish Tyagi 7 years, 9 months ago

harshey chase experiment

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Lavish Tyagi 7 years, 9 months ago

lac operon model

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Lavish Tyagi 7 years, 9 months ago

embryo sac

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important diagrams for boards exams?

Posted by Ratnesh Dubey 7 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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Any easy tricks to learn

Posted by Deepak Kumar 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Lavish Tyagi 7 years, 9 months ago

make concepts

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Lavish Tyagi 7 years, 9 months ago

learn in points

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Is there any easy way of learning those microbes????

Posted by Deepak Kumar 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Tehrim Rockstar 7 years, 9 months ago

Watch vipin sharma biology tutorials...

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What is culture cultivation in bio reactors?...

Posted by Harshita Singh 7 years, 9 months ago

CBSE > Class 12 > Biology

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Why there is no natural death in single called organism.

Posted by Sushant Singh 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Naveen Yadav 7 years, 9 months ago

In unicellular living beings somatoplasm and germplasm not differentiate

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Tarun Negi 7 years, 9 months ago

Beacuse they reproduce asexually and after reproduction transform into a new organism. Let's take a eg. Of amoeba(single cell) he reproduce through binary fission when it reproduce it divides and produce 2 daughter cell. So, we can say that the parent ameoba doesn't die. It retransform into a new cell. In this way we can say that no natural death is possible in single celled organism. Hope You understand from my answer Thank you

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What is heterocis

Posted by Lavish Sharma 7 years, 9 months ago

CBSE > Class 12 > Biology