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

because parrot has 140 years lifespan since its is very small also elephant is bigger its lifespan is 70 years only so, its not the fact that if animal is big then its lifespan also big so, we cannot corelate lifespan with size of an organism

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What is replication fork

Posted by Aman Singh 6 years, 9 months ago

CBSE > Class 12 > Biology

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How sexual reproduction enables the organisms like algae and fungi to survive during unfavourable condition ? Why is sexual reproduction favoured under such condition ?

Posted by Priya Shyam 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Aditya Raj 6 years, 9 months ago

It is because sexual method of reproduction is more protective than asexual method.

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There is an enzyme called statin 1.Name the organism from which it get extract ? 2.What is the use and function of it?

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Aishwarya S 6 years, 9 months ago

1. Statin is extracted from Monascus purpureus
2.It helps in lowering blood cholesterol level

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Name the enzyme present in the acrosome of sperm?

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Shatayu Ganvir 6 years, 9 months ago

Hyaluronidase

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Anjali Yadav 6 years, 9 months ago

Sperm lysin

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Why is better genitic material RNA or DNA. Why?

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

4 answers

Sivan Karthick 6 years, 9 months ago

Due to its deoxyribose sugar, which contains one less oxygen-containing hydroxyl group, DNA is a more stable molecule than RNA, which is useful for a molecule which has the task of keeping genetic information safe. RNA, containing a ribose sugar, is more reactive than DNA and is not stable alkyline conditions

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Anjali Yadav 6 years, 9 months ago

DNA because due to stability or presence of nitrogen bases

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Ashish Sinha 6 years, 9 months ago

Why Give the reason

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Manoj Nagar 6 years, 9 months ago

DNA

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Is vegetative reproduction also type of asexual reproduction? Why do you say so? Is the term clone applicable to the offspring form by vegetative reproduction

Posted by Lalita Devi 6 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Sivan Karthick 6 years, 9 months ago

yes vegitative reproduction is also a type of asexual reproduction becaue by the basic definition of asexual reproduction (i.e a single parent gives offsprings without involvement of gamites) yes the offsprings produced in vegitative reproduction is a clone of parent because since no genitic recombination of dna takes place in vegitative reproduction

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Priya Shyam 6 years, 9 months ago

The term clone is applicable for offspring form by vegetative reproduction as they are morphologically & genetically similar to their parents.

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Priya Shyam 6 years, 9 months ago

Yes vegetative reproduction is also a type of asexual reproduction asin this process there is no involvement of two parents , a single parent is capable of giving rise to an offspring

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What are different between binary fission and multifission in ameaba

Posted by Lalita Devi 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Ashish Sinha 6 years, 9 months ago

Binary fission in amoeba : It is a normal condition seen in amoeba in which it divides longitudinally and form two daughter progenies Multiple fission in amoeba :This condition occur in the unfavourable condition in which amoeba start surrounded by a tough layer and inside it multiple division starts and in favourable condition it starts releasing progeny or get burst

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Can i get the exact or approximate lifespan of some organisms fig.1.1 page no. 4 from reproduction in organisms of class 12 according to cbse and neet.?

Posted by Toxic Nation 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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How can i earn capital to buy test series

Posted by Prateeksha Tiwari 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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Describe pre fertilisation event.

Posted by Akancha Gond 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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What would happen if syngamy does not occur?

Posted by Sataybir Sataybir 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Aditya Raj 6 years, 9 months ago

If syngamy do not occur then parthenogenesis is occur.

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Have you ever wondered how the gamates meet?

Posted by Sataybir Sataybir 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Miira Kapoor 6 years, 9 months ago

What

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How to study biology

Posted by Paras Kundu 6 years, 9 months ago

CBSE > Class 12 > Biology

5 answers

Abhishek Yadav 6 years, 9 months ago

Bio is very knowlegable subjet if we study this subject in morning times with our teacher then we study all the consept easily . My opinon is that we should study this more and more times in morning.

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Aditya Raj 6 years, 9 months ago

for board and competition exam you should study bio from line by line of NCERT. every line of ncert bio have big and valuable concepts.

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Sataybir Sataybir 6 years, 9 months ago

Written practice is necessary in biology

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Taniya Malik 6 years, 9 months ago

Study regularly and make the concepts clear

2Thank You

Christin Mathew 6 years, 9 months ago

Rote learning is best for biology

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What is the dua nature of codon 'AUG'

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Christin Mathew 6 years, 9 months ago

It code for methionine, it act as a initiation codon

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In pBR322 plasmid,there is a restriction enzyme called BamH1 . 1.Expand it . 2.Name its recogniion site.

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

0 answers

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In how many hosts does mosquito complete its cycle and why ?

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 5 months ago

Malaria infection begins when an infected female Anopheles mosquito bites a person, injecting Plasmodium parasites, in the form of sporozoites, into the bloodstream. The sporozoites pass quickly into the human liver. The sporozoites multiply asexually in the liver cells over the next 7 to 10 days, causing no symptoms. The stage infective for humans is the uninucleate, lancet-shaped sporozoite (approximately 1 × 7 μm). Sporozoites are produced by sexual reproduction in the midgut of vector anopheline mosquitoes and migrate to the salivary gland. Plasmodium parasites' primary hosts and transmission vectors are female Anopheles mosquitoes. Humans and other vertebrates are secondary hosts. The mosquitoes first take in the parasite by feeding on the blood of an infected person.

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Why testis is known as primary *** organ ?

Posted by Ashish Sinha 6 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Aditya Raj 6 years, 9 months ago

Testis release essential hormone - testosterone not androgen.

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Taniya Malik 6 years, 9 months ago

Bcoz testis is the place where sperms are formed Testis release the androgen which is responsible for maintaining the male *** characterstics So it is the primary male *** organ

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Astha Dewangan 6 years, 9 months ago

These hormones are responsible for controle and onset of whole reproduction process.Hence ovaries in female and testis is known as primary organ.

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Is vegitative reproduction also a type of asexual reproduction? Why do u say so

Posted by Kaushik Singh 6 years, 9 months ago

CBSE > Class 12 > Biology

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What is the difference between cardiac arrest and heart attack ?

Posted by Dewang Rawal 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 5 months ago

A heart attack is when blood flow to the heart is blocked, and sudden cardiac arrest is when the heart malfunctions and suddenly stops beating unexpectedly. A heart attack is a “circulation” problem and sudden cardiac arrest is an “electrical” problem. A heart attack occurs when a blocked artery prevents oxygen-rich blood from reaching a section of the heart. If the blocked artery is not reopened quickly, the part of the heart normally nourished by that artery begins to die. The longer a person goes without treatment, the greater the damage. Sudden cardiac arrest occurs suddenly and often without warning. It is triggered by an electrical malfunction in the heart that causes an irregular heartbeat. With its pumping action disrupted, the heart cannot pump blood to the brain, lungs and other organs. Seconds later, a person loses consciousness and has no pulse. Death occurs within minutes if the victim does not receive treatment.

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What are zoospores

Posted by Esha Chanana 6 years, 9 months ago

CBSE > Class 12 > Biology

3 answers

Aditya Raj 6 years, 9 months ago

Zoo means motile and spore means reproductive part. So, Zoospores are motile(flagellated) reproductive structures that take part in reproduction.

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Yogita Ingle 6 years, 9 months ago

Zoospore: A zoospore is a motile asexual spore that uses a flagellum for locomotion. Also called a swarm spore, these spores are created by some algae, bacteria and fungi to propogate themselves.

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Sia Mourya 6 years, 9 months ago

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Diffence between cockroach and scorpion

Posted by Mansi Wadhera 6 years, 9 months ago

CBSE > Class 12 > Biology

2 answers

Kawalpreetsingh Sandhu 6 years, 9 months ago

Cockroach 1 It is an insect. 2 It have six legs. 3 They have three body segments. Scorpion 1 It is an animal. 2 It have eight legs. 3 They have two body segments.

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Yakshi Baliyan 6 years, 9 months ago

i m scorpion?

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The process of joining together different DNA fragments is often referred to as

Posted by Suryansh Kapil 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Rishabh Zood 6 years, 9 months ago

It is called Renaturation of DNA

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It is now possible to breed plants & animals with desired characters through a. Genetic engineering b. Chromosome engineering c. Gel electrophoresis d . Tissue culture

Posted by Suryansh Kapil 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Harsh Mishra 6 years, 9 months ago

Genetic Engineering...........The process of genetic engineering requires the successful completion of a series of five steps. DNA extraction is the first step in the genetic engineering process. In order to work with DNA, scientists must extract it from the desired organism.With the help of Genetic Engineering, plant breeding is Possible......

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Can anyone help me

Posted by Janvi Chaudhary 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Kawalpreetsingh Sandhu 6 years, 9 months ago

Wats ur problem

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What are the ans for table 1.1

Posted by Janvi Chaudhary 6 years, 9 months ago

CBSE > Class 12 > Biology

1 answers

Priya Shyam 6 years, 9 months ago

It is very simple See 1 example which is given in ncert Organisms 2n n Human beings 46 23 You have to simply divide the chromosome number(2n) by 2 and you will get the n value 46÷2=23 And the one in which the (n ) is given multiply it to get 2n For housefly 2n - 12 and n - 6 For rat 2n - 42 and n -21

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What is the importance of the mmc undergoing meiosis

Posted by Princi Kasaudhan 6 years, 9 months ago

CBSE > Class 12 > Biology