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

Evolution happens when changes occur in living beings ya. This change is not happening or had happened ar a fast rate because of the larger life span. So a fish didn't change to an amphibian all of a sudden. So it really takes a lot of time most importantly the changes species should be selected by the nature

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Go Pika 7 years, 9 months ago

Determinism stochastic. Nice vocabularies :p

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ANSWER

For supplementary material are you studying only book or something else. Because here people learnt more than needed. Say no

Posted by Go Pika 7 years, 9 months ago

CBSE > Class 12 > Biology

9 answers

Pawan Waraich 7 years, 9 months ago

Mention not ??

1Thank You

Pawan Waraich 7 years, 9 months ago

1Thank You

Go Pika 7 years, 9 months ago

Oh. I'm still studying yaar !_! I have 7 lessons up !_! Our teacher have us a pdf for supplementary material thats why I'm asking. Thanks :)

1Thank You

Pawan Waraich 7 years, 9 months ago

?????

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Pawan Waraich 7 years, 9 months ago

Gopika r u there ?

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Pawan Waraich 7 years, 9 months ago

For Supplementary material i studied from ncert and trueman

1Thank You

Pawan Waraich 7 years, 9 months ago

Now I m just recalling

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Pawan Waraich 7 years, 9 months ago

I m studying only from book .........moreover I 've completed Xam idea

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Go Pika 7 years, 9 months ago

Some on say ya.

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Digestion and absorption

Posted by D Jyothi 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Go Pika 7 years, 9 months ago

After digestion of food, i.e breaking down to simple molecules,you eat , by the digestive system, the nutrients from it is absorbed by the process of absorbsion by the finger like structures eich with blood vessels in small intestine

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ANSWER

Is pedigree analysis in syllabus

Posted by Poja Kumar 7 years, 9 months ago

CBSE > Class 12 > Biology

7 answers

Pawan Waraich 7 years, 9 months ago

1Thank You

Go Pika 7 years, 9 months ago

Answer that question above

1Thank You

Pawan Waraich 7 years, 9 months ago

Hmmmm?

1Thank You

Go Pika 7 years, 9 months ago

Shagun you there?

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Go Pika 7 years, 9 months ago

Definitely

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Gullu Verma 7 years, 9 months ago

Yes

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Pawan Waraich 7 years, 9 months ago

Yeah

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ANSWER

Chapter vice marking scheme

Posted by Poja Kumar 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

H K 7 years, 9 months ago

Check it out at CBSE.nic

1Thank You

ANSWER

what are molecular scissors

Posted by Yash Sharma 7 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

Muskan Sinha 7 years, 9 months ago

Molecular scissors are the restriction enzymes that is endonuclease and exonuclease which cuts DNA at specific region

1Thank You

Go Pika 7 years, 9 months ago

*pg195

2Thank You

Go Pika 7 years, 9 months ago

3rd page beginning of that lesson

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Go Pika 7 years, 9 months ago

They cut dna at specific regions

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ANSWER

Animal with internal fertilisation have better chances of survival compared to those with external fertilisation

Posted by Shashank Bharti 7 years, 9 months ago

CBSE > Class 12 > Biology

6 answers

H K 7 years, 9 months ago

In internal fertilization constant temperture is also maintained which helps in survival of embryo or young ine

1Thank You

Go Pika 7 years, 9 months ago

Oh ok.

1Thank You

Pawan Waraich 7 years, 9 months ago

Ok I got it I' ve seen it now

0Thank You

Go Pika 7 years, 9 months ago

Shugan I've answerd you. Are You not there?

1Thank You

Shagun Waraich 7 years, 9 months ago

Young ones**

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Shagun Waraich 7 years, 9 months ago

Bcoz in internal fertilization youngs are not exposed to predators and parental care is provided

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ANSWER

In co dominance example of blood group Is 'O' blood group gene recesive to A and B

Posted by H K 7 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

H K 7 years, 9 months ago

Means thanks

1Thank You

H K 7 years, 9 months ago

Yes I got your answer thanjs

1Thank You

Shagun Waraich 7 years, 9 months ago

Got it ??

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Shagun Waraich 7 years, 9 months ago

O blood group gene are recessive i.e.ii

0Thank You

Shagun Waraich 7 years, 9 months ago

In codominace e.g. blood group AB

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ANSWER

????

Posted by Shagun Waraich 7 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

Pawan Waraich 7 years, 9 months ago

Yeah

0Thank You

H K 7 years, 9 months ago

Is it in ncert syllabus

0Thank You

Shagun Waraich 7 years, 9 months ago

Thanks

1Thank You

Isabelle Matthew 7 years, 9 months ago

Ichthyosaur

1Thank You

Shagun Waraich 7 years, 9 months ago

What is scientific name of fish like reptile

1Thank You

ANSWER

Can we give example for degenerate codon as stop codon???

Posted by Pranjali Mahajan 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Pranjali Mahajan 7 years, 9 months ago

OK thanks?

1Thank You

Shagun Waraich 7 years, 9 months ago

No we can't give example for degenrate as stop codon ..............bcoz degenerate codon mean same amino acid are coded by more than one codon e.g. UUC and UUU codes for phenylhaline stop codon do not code for any amino acid

1Thank You

ANSWER

Structure of morphine and cannabinoids.....is it important??

Posted by Shristi Raj 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Tanuja Biswas 7 years, 9 months ago

Tilp now they have never been asked .....the plant names from which these are obtained and their physiological effects are imp.

1Thank You

ANSWER

Why replication in the lagging strand occur in a discontinuous fashion?

Posted by Supratick Ghosh 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Shristi Raj 7 years, 9 months ago

It is bcoz replication always take place from 5' -3' end.....in template strand which is 3'-5', antiparallel strand is synthesized from 5'-3' nd replication start just after opening of replication fork..... but in another strand which is 5'-3' it waits for fork to open little bit...then from 5'-3' end replication takes place in fragments because it waits for opening of fork..... this is why it is discontinuous.....refer diagram in book it will be clear

2Thank You

ANSWER

Notable Difference between aquaculture and pisciculture

Posted by Pranav Rastogi 7 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

Pranav Rastogi 7 years, 9 months ago

Thanks

1Thank You

Pranav Rastogi 7 years, 9 months ago

Than

1Thank You

Go Pika 7 years, 9 months ago

Aquaculture is about raising any water animals like lobsters crabs etc. And sold for commercial purpose. Clear?!???

2Thank You

Go Pika 7 years, 9 months ago

Pisiculture is related to fish raising both in fresh and salt water and selling commercially or used for domestic uses

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ANSWER

Are you people doing 3 hours paper test?

Posted by Go Pika 7 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

Go Pika 7 years, 9 months ago

Shagun you there?

3Thank You

Go Pika 7 years, 9 months ago

Cool even my teacher said the same. But she insisted to write key words taking up full papers. What's your method. I'm yet not started to do it.

1Thank You

Pranav Rastogi 7 years, 9 months ago

No not at all

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Go Pika 7 years, 9 months ago

.....????

1Thank You

Go Pika 7 years, 9 months ago

For practice I mean. Because I'm just sitting with ncert and previous year questions along with a very few examplar problems

1Thank You

ANSWER

Difference between primates and non-primates?

Posted by Suryansh Dwivedi 4 years, 7 months ago

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 7 months ago

Primates	Non-primates
Primates are an order of mammals which are characterised by a large brain, usage of hands and complex behaviour.	Non-primates are referred to as all animals that are no primates.
They possess a voluminous complicated forebrain	They possess a small forebrain.
Ideally, all primates are intelligent.	Some non-primates are intelligent.
They have dexterous limbs.	Some non-primates have limbs for locomotion.
Primates have opposable thumbs and four extra fingers in each hand which help them with grasping.	Non-primates are unable to grasp their limbs.
Primates mainly rely on their vision.	Non-primates mainly rely on their smell.
They have forward eyes with stereoscopic vision.	They possess a different organisational level in their eyes such as complex and simple eyes.
Primates generally possess a clavicle.	Non-primates lack a clavicle.
Females show menstrual cycle	Females show oestrous cycles.
They are continuous breeders.	They are seasonal breeders.
Example: apes, monkeys, humans.	Example: birds, reptiles, amphibians.

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ANSWER

State the l aw of dominance

Posted by Nischal Sharma 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Go Pika 7 years, 9 months ago

:( fingers crossed. 2 days more

0Thank You

Go Pika 7 years, 9 months ago

Law of dominance states that : in a dissimilar pair of allele (factors) the one which is expressed is called as dominant and other is (which is not expressed) is called as recessive.

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ANSWER

Cry gene

Posted by Tejprata Dangi 7 years, 9 months ago

CBSE > Class 12 > Biology

7 answers

H K 7 years, 9 months ago

Sorry cry gene codes for cry protein and is found in bacillus thurigenesis Bt.

0Thank You

H K 7 years, 9 months ago

It is an indigestible protein which blocks gut of pests by interacting with the acidic surrounding, it's full form is crystal protein

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Pranav Rastogi 7 years, 9 months ago

Genes that code for insecticide protein in Bt

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Go Pika 7 years, 9 months ago

Bt*

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Go Pika 7 years, 9 months ago

By toxins are coded by cry genes

2Thank You

Go Pika 7 years, 9 months ago

Worm.

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Go Pika 7 years, 9 months ago

Boll warm.

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ANSWER

Cloning vector

Posted by Tejprata Dangi 7 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What are the no. of chromosomes in meiocytes of onion

Posted by Pranav Rastogi 7 years, 9 months ago

CBSE > Class 12 > Biology

6 answers

Shristi Raj 7 years, 9 months ago

In old book it's 32......cbse has corrected it to 16

0Thank You

Pranav Rastogi 7 years, 9 months ago

Are u sure

0Thank You

Simran Dhiman 7 years, 9 months ago

It is 16

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Go Pika 7 years, 9 months ago

Then that would be the answer

0Thank You

Pranav Rastogi 7 years, 9 months ago

Somebody plz answer

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Pranav Rastogi 7 years, 9 months ago

Bcoz according to ncert it is 32.and everywhere else it is 16

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ANSWER

Which population growth curve is shown by present human population

Posted by Nidhi Thakre 7 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

H K 7 years, 9 months ago

It must be J - shape curve because human origin is traced back to be 2 lakh yrs. ago and after a slow growth in initial years it started growing rapidly literally getting doubled every year and now have reached in billions, it is similar to those of dinosaurs who vanished almost suddenly from the landscape

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Go Pika 7 years, 9 months ago

So logistic growth.

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Go Pika 7 years, 9 months ago

S only. Practically. Because exponential growth is not practically possible

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Go Pika 7 years, 9 months ago

S+J :p

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ANSWER

What is process of RNAi ????????

Posted by Pankaj Sihag 7 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Go Pika 7 years, 9 months ago

sense and anti-sense RNA codes by the infuses gene will firm complementary to each other and scilence the mRNA of the nematode

2Thank You

Go Pika 7 years, 9 months ago

As the.nematode can't thrive in such a host producing iRNA it can't live and hence die

2Thank You

Go Pika 7 years, 9 months ago

To interfere with the mRNA of the nematode and stop it's it's funtion

2Thank You

ANSWER

What is the role of melatonin in organisms?

Posted by Shaista Shaista 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

H K 7 years, 9 months ago

No it helps organism in getting a sleep and is produced by body when we feel tired or sleepy

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Go Pika 7 years, 9 months ago

That's for that protection from sun . Right!?!

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ANSWER

How insulin produced?

Posted by Akhilesh Sharma 7 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Go Pika 7 years, 9 months ago

From isolating gene for producing insulin from pig. And incorporating in E.coli

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Saduo Kyapaomai 7 years, 9 months ago

See ur answer in web.???

0Thank You

ANSWER

What is a cloning vector?

Posted by Benedict Sabu 7 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Dheeraj Singh 7 years, 9 months ago

GGenetically and morphological similar similar to clone

1Thank You

ANSWER

Name to STDs that do not affect reproductive organs?

Posted by Jyoti Bishnoi 7 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

Go Pika 7 years, 9 months ago

Sorry I mistook the question

1Thank You

Dheeraj Singh 7 years, 9 months ago

AIDS do not affect reproductive organ

2Thank You

Go Pika 7 years, 9 months ago

Con....s

2Thank You

Go Pika 7 years, 9 months ago

Saheli,

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ANSWER

Guys. Which all questions you feel sure to come?!?

Posted by Go Pika 7 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

Go Pika 7 years, 9 months ago

Good. But I hope you saw the work 'feel' our gut might say no. Like this may surly come ;)

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Krishna Pandey 7 years, 9 months ago

Agar hame Pata hota to Phir 70 me 100 lekar aa jate???

2Thank You

Go Pika 7 years, 9 months ago

Syllabus over?

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H K 7 years, 9 months ago

Any structure diagram from reproduction part ,equational graph in population chap. ,pedigree analysis and mendelian disorders may come this time

1Thank You

Go Pika 7 years, 9 months ago

A sort of try!

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ANSWER

How is it possible in oxalis and viola plants to produce assured seed sets even in the absence of pollinators?

Posted by Ruchi Bhosale 7 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Go Pika 7 years, 9 months ago

They come under Autogamy . Self pollination. So no need of pollinators. Because the reproductive parts lie close to each other to bring about fertilization

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Go Pika 7 years, 9 months ago

Chasmogamous*

1Thank You

Go Pika 7 years, 9 months ago

Cleistogamous

1Thank You

ANSWER