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

Fasciola hepatica occurs in the liver of a definitive host and its lifecycle is indirect. Definitive hosts of the fluke are cattle, sheep, and buffaloes. Wild ruminants and other mammals, including humans, can act as definitive hosts as well.

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Yogita Ingle 6 years, 6 months ago

Terrestrial snail and fish are two intermediate hosts on which the human liver fluke depends to complete its life cycle so as to facilitate parasitization of its primary host.

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Yojna Chauhan 6 years, 6 months ago

Hqhhqshrhhzns

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ANSWER

Short note on moet???

Posted by Juhu Gupta 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Nishu Goyal 6 years, 6 months ago

Multiple ovulation embryo transfer technique. In this method with the help of artificial hormones like FSH cattle are stimulated to show superovulation. Formed eggs are fertilized with the help of non surgical method eggs are obtained from genetical mother are transfered in surrogate mother for development . Thus many superior progeny can be obtained in short period of time

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Manika Gupta 6 years, 6 months ago

Moet is multi ovulation embryo transfer....this technique is used to obtain a large number of progeny of superior quality in less time

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ANSWER

Define transcription and translation

Posted by Jaat Sahil 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Manika Gupta 6 years, 6 months ago

Formation of rna from dna is transcription and formatio of proteins from rna is translation

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Saveksha Kadian 6 years, 6 months ago

Formation of dna from rna is called transcription and rna to protein is called translation ..

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ANSWER

How is monocistron differ from momocistron

Posted by Mohd Javed 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Nishu Goyal 6 years, 6 months ago

Yeh momocistron kuch nhi hota printing mistake hogi

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ANSWER

a tissue culture experiment has been performed with plant tissue infected with TMV meristemetic tissue produces healthy plant .Reason out possibility of obtaining such result

Posted by Gurwinder Singh 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Nishu Goyal 6 years, 6 months ago

Because meristemetic tissue is free from virus ( meristemetic cell fast division than virus) so by culturing them virus free plantlet can be obtained

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ANSWER

Exam pattern of biology according to new instructions given by CBSE for 2019 -2020

Posted by Chanpreet Singh 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Arpita Tiwari 6 years, 6 months ago

There will be 8 mcq and total no. Of questions are 30

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Gargi Varshney 6 years, 6 months ago

There is no information about the pattern of 2019-20 board exams.

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ANSWER

clones

Posted by Md Zeeshan 6 years, 6 months ago

CBSE > Class 12 > Biology

3 answers

Arpita Tiwari 6 years, 6 months ago

Clones are exactly copies of their parents and they don't show variation and evolution becuse they re genetically and morphologically similiar i.e. exactly copies Vlonrs ate produced in assexual process

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Prishi Singh 6 years, 6 months ago

Clones

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Aadi Ahluwalia 6 years, 6 months ago

Morphologically and genetically similar organisms

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ANSWER

Waitage of each lesson

Posted by Srikanth Srikanth 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Arpita Tiwari 6 years, 6 months ago

You can find ur syllabus or weightage on biology syllabus

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ANSWER

Important diagrams which may be can come in the board exam

Posted by Arjun Singh 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Humaira Badruddin 6 years, 6 months ago

Dna and rna which chapter

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Gargi Varshney 6 years, 6 months ago

Reproductive part of male and female,transcription,structure of DNA and RNA,and many more diagram may come in board exams.

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ANSWER

The two strands of dna always constant tell me why

Posted by Virender Kumar 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Sia ? 6 years, 6 months ago

by Hydrogen bond

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Nishu Goyal 6 years, 6 months ago

Because it is fixed by nature that pyramidine will make hydrogen bond with purin and when a thin bind with a thick always same distance is found between two strand .

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ANSWER

Why trna is called adaptor

Posted by Shivani Thakur 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Sneh Deswal 6 years, 6 months ago

It has the ability to attach itself with mRNA molecule via initiation and elongation. It helps in joining correct amino acids on growing polypeptide chain with its specific anticodon to the codon of mRNA chain. Is it not like an adapter ?

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ANSWER

Why do we have two eyes??

Posted by Rajput Boy 6 years, 6 months ago

CBSE > Class 12 > Biology

3 answers

Arpita Tiwari 6 years, 6 months ago

Because it is made by special creation i.e god

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Annu Khandey 6 years, 6 months ago

It helps to see objects in 3 dimensions ☺️

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Nishu Goyal 6 years, 6 months ago

To have a vision of 180 . Which is adapted to survive against Predator

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ANSWER

Principle of inheritence me mostly har topic ke bad diagram h kya plz tell me

Posted by Md Zubair Khan 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Yash Puren 6 years, 6 months ago

No exactly there is a chart to describe traits but not diagram

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Prafful Agrawal 6 years, 6 months ago

Haven't you visited NCERT..this chapter has least diagram

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ANSWER

Bio ke exam me date ya year se related question ate h kya

Posted by Md Zubair Khan 6 years, 6 months ago

CBSE > Class 12 > Biology

3 answers

Arpita Tiwari 6 years, 6 months ago

Yes ..sometimes they ask year related questions

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Alok Singh 6 years, 6 months ago

Only ncert k questions karo

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꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 6 months ago

I don't think so because in boards concepts are checked not facts....

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You are conducting artificial hybridization on papaya and potato. Which one would require step oe emasculation and why?However for both you will use process of bagging.justify giving one reason

Posted by Sakshi Kumari 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Nishu Goyal 6 years, 6 months ago

Potato will require emasculation because it is bisexual but not papaya. But bagging will be required by both to protect them from contamination.

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ANSWER

Differnce between codon and anticodon

Posted by Mσσn Míkαєl 6 years, 6 months ago

CBSE > Class 12 > Biology

2 answers

Sia ? 6 years, 6 months ago

anticodon is a nucleotide triplet at one end of a tRNA molecule that recognizes a particular complementary codon on an mRNA molecule. and codon is a sequence of three nucleotides which together form a unit of genetic code in a DNA or RNA molecule.

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Nishu Goyal 6 years, 6 months ago

Anticodon is that strand of DNA which will act as template and the other which don't participate Durning transcription is called codon strand

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ANSWER

Why heart attak

Posted by Parul Singh 6 years, 6 months ago

CBSE > Class 12 > Biology

4 answers

Sia ? 6 years, 6 months ago

A heart attack happens if the flow of oxygen-rich blood to a section of heart muscle suddenly becomes blocked and the heart can't get oxygen. Most heart attacks occur as a result of ischemic heart disease.

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Parul Singh 6 years, 6 months ago

Thank u all

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Ayush Kumar Tiwary Ayush 6 years, 6 months ago

Deposition of cholesterol in artery and veins causes brusting of these vessels

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Nishu Goyal 6 years, 6 months ago

Due to oxygen deficiency in cardiocells heart attack is caused .

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ANSWER

Correlate the phases of menstrual cycle with the levels of pitutary hormones in a human female.

Posted by Akriti Mishra 6 years, 6 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Explain the different phases of menstrual cycle and correlate the phases with the Different levels of ovarian hormones in a human female

Posted by Akriti Mishra 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 8 months ago

Menstruation: The period—the shedding of the uterine lining. Levels of estrogen and progesterone are low.
The follicular phase: The time between the first day of the period and ovulation. Estrogen rises as an egg prepares to be released.
The proliferative phase: After the period, the uterine lining builds back up again.
Ovulation: The release of the egg from the ovary, mid-cycle. Estrogen peaks just beforehand, and then drops shortly afterwards.
The luteal phase: The time between ovulation and before the start of menstruation, when the body prepares for a possible pregnancy. Progesterone is produced, peaks, and then drops.
The secretory phase: The uterine lining produces chemicals that will either help support an early pregnancy or will prepare the lining to break down and shed if pregnancy doesn’t occur.

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Provide me current detailed prescribed syllabus of biology with marking scheme

Posted by Arpita Tiwari 6 years, 6 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Which reference book is best for biology class 12

Posted by Ananya Rai 6 years, 6 months ago

CBSE > Class 12 > Biology

4 answers

Yash Puren 6 years, 6 months ago

Pradeep All in one Together with

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Xamidea + arihant

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Mohmmad Zain 6 years, 6 months ago

arihant chapter wise

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Pritam Singh 6 years, 6 months ago

According to you use pachi publication

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ANSWER

Will biology also contain objective questions in session 2019-2020 ?

Posted by Shelly Lohat 6 years, 6 months ago

CBSE > Class 12 > Biology

3 answers

Alok Singh 6 years, 6 months ago

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Arpita Tiwari 6 years, 6 months ago

Only 8 objective will come in biology exam

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Pritam Singh 6 years, 6 months ago

Yes don't worry

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Kisi ko biotech aati h acche se ??

Posted by Aadi Ahluwalia 6 years, 6 months ago

CBSE > Class 12 > Biology

25 answers

K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Hn yha pr b online raat ko hi aati hu

1Thank You

K@Łp@N@ $Øđh!?? 6 years, 6 months ago

But main whatsapp use nhi krti only instagram use krti hu

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Acha ji

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Aadi Ahluwalia 6 years, 6 months ago

What's app pr to mai online hi rhta hu jada tr

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Aadi Ahluwalia 6 years, 6 months ago

Tum jada aate ho online ??

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Hmmm

1Thank You

Aadi Ahluwalia 6 years, 6 months ago

1Thank You

K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Vaise tum online bht kam aate ho yha pr

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Chlo achi baat h ji

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Aadi Ahluwalia 6 years, 6 months ago

No only what's app

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Tum social media use krte ho

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Haryana dist. Karnal vill. Dabarthala

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Aadi Ahluwalia 6 years, 6 months ago

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

1Thank You

Aadi Ahluwalia 6 years, 6 months ago

Belong to panipat ,haryana

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Aadi Ahluwalia 6 years, 6 months ago

Me rhta hu

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Aadi Ahluwalia 6 years, 6 months ago

Delhi

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Aap kha se ho

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Aadi Ahluwalia 6 years, 6 months ago

Ha bolo

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Hllo

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

ELISA Principle. Enzyme-linked Immunosorbent Assays (ELISAs) combine the specificity of antibodies with the sensitivity of simple enzyme assays, by using antibodies or antigens coupled to an easily-assayed enzyme. ELISAs can provide a useful measurement of antigen or antibody concentration.

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Alok Singh 6 years, 6 months ago

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Aadi Ahluwalia 6 years, 6 months ago

What is the principle of ELISA

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Yes

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Nishu Goyal 6 years, 6 months ago

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Duplicate gene

Posted by Ranjeeet Singh 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Ranjeeet Singh 6 years, 6 months ago

The two pairs of gene which determine same or nearly same phenotype hence either of them is able to produce the character

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ANSWER

How many autosomes are present in an human sperm???

Posted by Alisha Jajodia 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Gaurav Seth 6 years, 6 months ago

22 Autosomes are found in a single mature human sperm.

Explanation:

Human body cells (except eggs and sperm) have 23 pairs of chromosomes. Of these, 22 pairs are autosomes and 1 pair are *** chromosomes.

This is a male as you can see by the XY. Females have XX as their *** chromosomes.

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ANSWER

Can anyone provide me his /her notes of class 12th biology

Posted by Sameer Nehra 6 years, 6 months ago

CBSE > Class 12 > Biology

3 answers

Sameer Nehra 6 years, 6 months ago

Fb or Whatsapp or insta

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Ayush Ranjan 6 years, 6 months ago

Yes bt how

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Aadi Ahluwalia 6 years, 6 months ago

Yes but how

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What is difference between small pox and chicken pox ..other then causitive organism

Posted by Pavithra A S 6 years, 6 months ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 6 years, 6 months ago

S.N	Characteristics	Chickenpox	Smallpox
1	Causative Agent	Varicella Zoster Virus (Herpes Virus)	Variola virus (Pox Virus)
2	Incubation period	14-21 days	7-17 days
3	Severity	Chickenpox is less deadly comparing to small pox.	Smallpox is deadly severe comparing to chicken pox.
4	Lesions	Lesions first appear on the face or trunk.	Lesions first appear in the throat or mouth, then on the face, or on the upper arms.
5	Rash Lesions	Lesions develop in successive fashion. While some are new, others are crusting over (in “crops”).	Lesions develop at the same time, and they look alike on any one section of the body, such as the abdomen, arms, or face.
6	Initial Symptoms	0 to 2 days of mild illness pass before the rash develops.	2 to 3 days of severe illness pass before the rash develops.