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Give reason why Marchantia is considered dioecious.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 21 hours ago

Marchantia is considered dioecious because Both *** organs in the separate individuals.

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Give reason why bamboo plants are considered to have unusual flowering response.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 23 hours ago

Flowering in Bamboo plant is considered a unique flowering process because this type of flowering is very rare and unique in plant kingdom. Bamboo plant produces spectacular flowers once every 60 to 130 years, depending upon the species. Similarly, a plant of Neela kuranagi exhibit flowers once in 12 years.

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Define cleistogamous ...

Posted by Jinu 😊🙃😉 2 days, 1 hour ago

CBSE > Class 12 > Biology

3 answers

Jass . 1 day, 9 hours ago

Cleistogamous flowers are closed flowers. They have anther and stigma within the closed flower. In them self pollination take place. They do not require pollinating agencies. Examples- viola , peanut , pea

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Nupur Sengar 1 day, 12 hours ago

Flower that do not open.

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😃 😃 1 day, 23 hours ago

Flowers which are open are called cleistogamous.

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Give reason why water hyacinth is called as invasive weed.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 23 hours ago

Water hyacinth reproduces vegetatively by off sets. It propagate, vegetatively, at an enormous and alarming rate. Therefore it spreads all over the water body and fully covers it within a short period of time. Thus, it has become the most invasive aquatic weed.

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Give reason why mammals living in natural wild condition are seasonal breeders.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 23 hours ago

Many mammals, especially those living in natural wild conditions exhibit reproductive cycles only during favourable seasons in their reproductive phase and are therefore called seasonal breeders.

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Give reason why rotifers are called as parthenocarpic organism.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

Shagun Sharma 19 hours ago

the phenomenon in which the egg or ovum develops into an embryo and then into a new organism without the act of fertilization is called parthenogenesies e.g. male honeybee rotifers and green algae like ulothrix.

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In which organisms gametes are non-motile? How do they reach the female gamete for fertilization?

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

4 answers

😃 😃 1 day, 23 hours ago

Angiosperms produce non-motile gametes. They reach the female gamete with the help of air or water.

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Nidhi Kashyap🤓🤓 2 days ago

Idk ?

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Nidhi Kashyap🤓🤓 2 days ago

Kya 🤔

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Jinu 😊🙃😉 2 days, 1 hour ago

Idk

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How is sexuality of papaya plant different from a maize plant?

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 23 hours ago

The sexuality is different because the sexes in the papaya plant are found on different trees , the male is on a different tree while the female is in a different tree while the sexes of the maize plant are found on the same plant.

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Differentiate between pre fertilization and post fertilization.

Posted by Diwakar Khandelwal 2 days, 1 hour ago

CBSE > Class 12 > Biology

1 answers

😃 😃 1 day, 23 hours ago

*Pre fertilisation is the event that takes place after the process of fertilisation when fusion of male and female gamets take place, in case of sexual reproduction. while in asexual reproduction, it is when the anthers get transferred to stigma. *Post fertilisation is the event that takes place after the process of fertilisation when the zygote formation takes place, in case of sexual reproduction. while in asexual reproduction, it is when the ovary gets transformed into fruit and ovules get transformed into seeds.

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What is gel electrophoresis?

Posted by Isha Antil 2 days, 20 hours ago

CBSE > Class 12 > Biology

1 answers

😃 😃 2 days, 7 hours ago

It is a technique used to separate DNA fragments.

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In megasporogenesis the nucleus are divided from same origin so why after dividing their functions are different (Ch 2)

Posted by Bharat . 3 days, 5 hours ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Characteristics of life span

Posted by Anjali Kumari 3 days, 9 hours ago

CBSE > Class 12 > Biology

1 answers

Sia 🤖 3 days, 9 hours ago

Key characteristics of life-span development

Development is multidirectional.
Development is plastic.
Development is dependent on history and context.
Development is multidisciplinary.
Development is contextual.
Development Involves Growth, Maintenance, and Regulation of Loss.
Theme 2.
Biological Processes.

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Which of the following structures are found in fallopian tube? Morula, secondary oocyte, primary oocyte, secondary follicle, ovum, zygote, blastula, gastrula.

Posted by Shivam Agrawal 4 days, 23 hours ago

CBSE > Class 12 > Biology

3 answers

Shivam Agrawal 4 days, 21 hours ago

Secondary oocyte, ovum, zygote, morula

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😃 😃 4 days, 22 hours ago

Zygote

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😃 😃 4 days, 22 hours ago

Secondary oocyte, primary oocyte, secondary follicle, ovum

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ANSWER

Name the functions of Corpus luteum endometrium acrosome of sperm tail fimbria

Posted by Jai Yadav 5 days, 10 hours ago

CBSE > Class 12 > Biology

2 answers

Devil 😎 5 days, 6 hours ago

Corpus luteum release the hormone called progesterone... acrosome contains hyluronidiand acrosin.. sperm tail help in the movement of sperm... Fimbrae help in catching of egg from the ovary endometrium has been implantation of zygote

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Kavya S 5 days, 9 hours ago

Corpus luteum- for synthesis of progesterone, endometrium- implantation of zygote,acrosome- energy for sperms, fimbria- collection of ova

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Posted by Kavya S 6 days, 2 hours ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What are difference between meiotic and meiosis division?

Posted by Ashutosh Bind 6 days, 6 hours ago

CBSE > Class 12 > Biology

2 answers

😃 😃 6 days, 5 hours ago

Meiosis is a type of cell division that results in the formation of four daughter cells each with half the number of chromosomes as the parent cell. Mitosis is the type of cell division that results in the formation of two daughter cells each with the same number and kind of chromosomes as the parent cell.

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Kavya S 6 days, 5 hours ago

I think so both are same

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Compare in any three ways the chromosomal theory of inheritance

Posted by Omish Garg 6 days, 6 hours ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Dhruv 6 days, 2 hours ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Hai guys ! My friend was Ill and not completed study for board exams still now.Pls say some ideas and tips for her to get 450+ in exams . She is school topper in 10th class got 475 + marks in board

Posted by Kavya S 4 days, 22 hours ago

CBSE > Class 12 > Biology

2 answers

Kavya S 6 days, 21 hours ago

Thank u for ur wishes divyashree 🙂 Same too u💐

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Dhivyasree Mohan 6 days, 23 hours ago

There is no shortcut for success kavya..so she should give her utmost effort to get succeded in her aim..this yr qn.ppr will also be ec..so ask her not to worry.. wishing u and ur friend a very all the best --😊💐

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What is the explanations of microbes and its uses

Posted by Aniket Singh 1 week ago

CBSE > Class 12 > Biology

1 answers

😃 😃 6 days, 22 hours ago

* Microbes are diverse-protozoa, bacteria, fungi and microscopic plants viruses, viroid and also prions that are proteinacious infectious agents. * They are found everywhere on earth ranging from soil, air water and some inhabitable places. * Bacteria and fungi can be grown on nutritive media to form colonies, which can be seen by necked eyes and very useful in study of microorganisms. *Microbes cause many diseases in human beings, plants and animals. Several microorganisms are useful to man in diverse ways.

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What is red list? Give two uses of red list

Posted by Afreen Hossain 1 week ago

CBSE > Class 12 > Biology

1 answers

Kavya S 1 week ago

The Red List tells us which species are most in danger and which to conserve first. It is also a powerful tool for persuading governments to protect threatened species, and for most of the plant and animal species worldwide, it is vital

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Name the category of virus that carries reverse transcriptase? What is the purpose of this enzyme. 22. Give the technical terms for the following:

Posted by Afreen Hossain 1 week ago

CBSE > Class 12 > Biology

2 answers

😃 😃 1 week ago

Retrovirus carries reverse transcriptase. Reverse transcriptase converts RNA into DNA.

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Kavya S 1 week ago

Retrovirus

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What is Klinefelter's syndrome ?

Posted by Dhruv Garg 1 week ago

CBSE > Class 12 > Biology

2 answers

Sia 🤖 1 week ago

Klinefelter syndrome is one of the genetic disorders in males. It occurs when a male baby is born with more than required or extra X chromosomes. Many males consist of one X and one Y chromosome and an extra chromosome can cost a male with physical traits which are inappropriate for males.

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😃 😃 1 week ago

Klinefelter's syndrome is due to the presence of an extra copy of x-chromosomes in males like 44+xxy, 44+xxxy, etc. The affected individuals are phenotypically males. Symptoms - underdeveloped testes, presence of breaat-like structure, little growth of hair on face and body, no sperm formation, etc.

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Body content

Posted by Ankita Channewar 1 week, 2 days ago

CBSE > Class 12 > Biology

0 answers

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Why Transcription and Translation are coupled in prokaryotes

Posted by Omkar Padhy 1 week, 4 days ago

CBSE > Class 12 > Biology

2 answers

Dhruv Garg 1 week ago

This is because there is no nucleus in prokaryotes that separates the transcription and translation process. Therefore, when bacterial genes are transcribed then transcripts begin to translate immediately. Prokaryotic transcription occurs in the cytoplasm alongside translation and both processes occur simultaneously.

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Vaibhav Kumar 1 week, 3 days ago

I don't know

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What is sporangenesis

Posted by Abhay Rajpoot 1 week, 4 days ago

CBSE > Class 12 > Biology

3 answers

Dhruv Garg 1 week ago

Google it out

0Thank You

Vignesh.S Vicky 1 week, 2 days ago

The process of transfer of spermatids into sperm is known as Spermiogenesis

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Aditya Mishra 1 week, 3 days ago

The answer is hidden in the word...genesis means formation ...so it is simply the process of formation of spores

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What is mitosis and meiosis

Posted by Anushka Singh 1 week, 4 days ago

CBSE > Class 12 > Biology

1 answers

Sia 🤖 1 week, 4 days ago

Mitosis is a part of the cell cycle in which replicated chromosomes are separated into two new nuclei.
Meiosis is a special type of cell division of germ cells in sexually-reproducing organisms used to produce the gametes, such as sperm or egg cells.

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How a bt cotton made to attain resistance against ballworm?

Posted by Rupali Soni 1 week, 5 days ago

CBSE > Class 12 > Biology

1 answers

Kavya S 1 week ago

Specific Bt toxin genes were isolated from bacillus thuringlensis and incorporated into the several crop plants such as cotton. The choice of genes depends upon the crop and the targeted pest, as most Bt toxins are insect group specific. 2. The toxin is coded by a gene name cry. There a number of them, for example, the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms, and that of cryIAb controls corn borer.,

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Posted by Anushaa ❄❄ 1 week, 5 days ago

CBSE > Class 12 > Biology