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

Hi rohit u have got compartment then u have to do much hard work nd u have study every line of ncert if u want to pass then i give u a suggestion that is u have to first prepare those chapters which contains more matks in board like genetics nd u can check the blue print nd i more thing that is do practice of diagrams ......nd etc....tqq Deeksha ☺

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Harsh Pahuja 6 years, 10 months ago

You need to practice every kind of questions, previous year board questions as well as sample papers . First if all read NCERT thoroughly. Also manage to practice for tests.

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ANSWER

Mention the problem that are takes care of reproduction child health care programs

Posted by Meenu Baghel 6 years, 10 months ago

CBSE > Class 12 > Biology

2 answers

Souromi Chatterjee 6 years, 10 months ago

Reproductive health and strategies: Overpopulation Awareness about reproduction *** education Adolescence and related changes Sexually transmitted diseases Birth control and care of mother and child *** abuse and *** related crimes Infrastructural facilities and material support.

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Smreeti Biswas🤙🏻 6 years, 10 months ago

Grammar?

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What is congenital heart

Posted by Subham Sahu 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Sambhashini Sona 6 years, 10 months ago

It is a heart disease in infants

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ANSWER

If 10% of male in a population are colour blind then what % of females will be colour blind?

Posted by Nikita Saran 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 7 months ago

Colour blindness (colour vision deficiency, or CVD) affects approximately 1 in 12 men (8%) and 1 in 200 women in the world. In Britain, this means that there are approximately 3 million colour blind people (about 4.5% of the entire population), most of whom are male.

Colour blindness always pertains to the cone photoreceptors in retinas, as it is the cones that detect the colour frequencies of light.

About 8% of males, and 0.4% of females, are red-green colour blind in some way or another, whether it is one colour, a colour combination, or another mutation.

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Sexual transmitted disease by microbes

Posted by Rajat Beniwal 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Souromi Chatterjee 6 years, 10 months ago

Chlamydiasis, gonorrhoea, syphilis, trichomoniasis, genital herpes, genital warts, chancroid, hepatitis B, AIDS

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ANSWER

How sperms are ejected

Posted by Amarjit Hore 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Souromi Chatterjee 6 years, 10 months ago

***** is composed of three columns of erectile tissue namely two dorsal corpora cavernosa and one ventral corpus spongiosum.. on sexual arousal three bundles of tissue in ***** becomes engorged with blood and it ejaculates semen containing sperms in female reproductive tract

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Both wind and water pollinated flowers are not colourful and do not produce nectar.what would be the reason for this??

Posted by Shubham Pandey 6 years, 10 months ago

CBSE > Class 12 > Biology

3 answers

Shubham Pandey 6 years, 10 months ago

Thank you

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Harpreet Kaur 6 years, 10 months ago

Because they don't have to attract any pollinating agency towards them . They are simply pollinated by wind and water.

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Sunidhi Asthana 6 years, 10 months ago

Because wind and water pollinated flowers doesn't need any insect to attract for pollination so they are not colourful.

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ANSWER

What is the drawback of surgical method of birth control

Posted by Khushi Sharma 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Souromi Chatterjee 6 years, 10 months ago

Its reversibility is very poor.. may have some irritations in fallopian tube and vas deferens.

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What is difference between egg cell and polar cell

Posted by Rajat Beniwal 6 years, 10 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is Uniparentl

Posted by Hrishit Srivastava Hrs 6 years, 10 months ago

CBSE > Class 12 > Biology

2 answers

Harpreet Kaur 6 years, 10 months ago

Organism produced by single parent like amoeba.

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Manish Sharma 6 years, 10 months ago

Single parent

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What is oligospermia?

Posted by Varun Chaudhary 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Sunidhi Asthana 6 years, 10 months ago

Terms oligospermia, oligozoospermia, and low sperm count refer to semen with a low concentration of sperm and is a common finding in male infertility. Often semen with a decreased sperm concentration may also show significant abnormalities in sperm morphology and motility (technically oligoasthenoteratozoospermia).

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ANSWER

Spermatogenesis always continue after puberty in male then where the sperm store ,of large number?

Posted by Abhishek Saini 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Sunidhi Asthana 6 years, 10 months ago

Sperms are continuously degenerated by our body and new sperms are formed...

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Why orchidectomy occur??

Posted by Sunidhi Asthana 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Nikita Saran 6 years, 10 months ago

Removing the testicles helps ti control the growth of advanced prostate cancer, this is on orchidectomy, also called orchiectomy. After removal of the testicles, the level of testosterone in blood falls quickly.

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ANSWER

How does a potato reproduces? From which part

Posted by Aakash Yadav 6 years, 10 months ago

CBSE > Class 12 > Biology

2 answers

Samruddhi Dundage 6 years, 10 months ago

Potato reproduces asexually by vegetative propagation. Its vegetative propagule is tuber or stem tuber to bemore specific

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Gaurav Seth 6 years, 10 months ago

Potato is the underground modification of stem. It is called as stem tuber. Potato reproduces asexually by the process of vegetative propagation. Potatoes have small eyes which give rise to scaly leaves. In the rainy season these eyes start to produce scaly leaves due to availability of required amount of moisture. Scaly leaves develop into new plants.

*Asexual mode of reproduction: It is a mode of reproduction in which a single individual is responsible for creating a new generation of species.
*Vegetative propagation: This is the mode by which plants reproduce asexually. It involves the production of new plants from the vegetative parts of an existing plant.

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ANSWER

Difference between embryo genesis of monocote and dicot

Posted by Manisha Sandhu 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Gaurav Seth 6 years, 10 months ago

DICOT EMBRYO	MONOCOT EMBRYO
Dicot embryo is enclosed in between two cotyledons.	Monocot embryo is enclosed by a single cotyledon.
Dicot embryo has its plumule, future shoot in distal position.	Monocot embryo has its plumule in lateral position.
Dicot embryo has no protective sheaths on the plumule and radicle.	Monocot embryo has protective sheaths called as coleoptile covering the plumule and coleorrhiza covering the radicle.
Dicot embryo has no scutellum.	Monocot embryo has a scutellum.
Dicot embryo mostly does not have an endosperm to nourish it.	Monocot embryo has an endosperm to nourish the embryo.

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What is Triple fertilization?

Posted by Suraj Chaudhary 6 years, 10 months ago

CBSE > Class 12 > Biology

0 answers

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Mammary gland

Posted by Rashad Khan 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 7 months ago

A mammary gland is an exocrine gland in humans and other mammals that produces milk to feed young offspring. Mammals get their name from the Latin word mamma, "breast". Mammary glands, which are located in the breast overlying the pectoralis major muscles, are present in both sexes, but usually are functional only in the female. Externally, each breast has a raised nipple, which is surrounded by a circular pigmented area called the areola.

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Why there is million of sperm to fertilize a single ovum???

Posted by Sunidhi Asthana 6 years, 10 months ago

CBSE > Class 12 > Biology

4 answers

Sunidhi Asthana 6 years, 10 months ago

Okk thanku...

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Harsh Pahuja 6 years, 10 months ago

Phagocytosis takes place to prevent polyembryony state in humans. As it can cause adjoined twins or fraternal twins.

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Sunidhi Asthana 6 years, 10 months ago

Thanks ,but why phagocytosis of sperm occur???

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Harsh Pahuja 6 years, 10 months ago

The million of sperms are produced for single ovum because during the passage of sperms through uterus the phagocytosis of sperms takes place dur to which very few are left for fertilisation with ovum.

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ANSWER

Why is reproduction is essential for organism

Posted by Pallavi Dangi 6 years, 10 months ago

CBSE > Class 12 > Biology

3 answers

Keshab Kar Panda 6 years, 10 months ago

To ensure continuity of species

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Yogita Ingle 6 years, 10 months ago

Reproduction is a fundamental feature of all living organisms. It is a biological process by which living organisms produce offspring’s similar to them. Reproduction ensures the continuity of various species on the Earth. In the absence of reproduction, the species will not be able to exist for a long time and may soon get extinct.

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Souromi Chatterjee 6 years, 10 months ago

To maintain life on earth and continue the race of their species

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ANSWER

What are archaeocytes..??

Posted by Ankit Kumar Meena 6 years, 10 months ago

CBSE > Class 12 > Biology

3 answers

Aishwarya S 6 years, 10 months ago

Those cells which are capable of differentiating into any type of body cell are stem cell.They can be used to grow a single type of tissue too

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Ankit Kumar Meena 6 years, 10 months ago

Now, what is stem cells?

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Yogita Ingle 6 years, 10 months ago

Archaeocytes are stem cells which take part in the formation of gemmule in sponges. Gemmules are specialised structure which survive unfavourable conditions and later on, after germination give rise to new sponges.

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ANSWER

where graffian follicle present ???

Posted by Byydhdb Rhdhd 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Souromi Chatterjee 6 years, 10 months ago

Graffian foclicle is present in the ovary.. which ruptures to release an egg every month..

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ANSWER

If my father and mother blood group is o positive so how can my blood group become A+

Posted by Priyanka Ghose 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Harsh Pahuja 6 years, 10 months ago

Parent:

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ANSWER

What causes polyembryony?

Posted by Harsh Pahuja 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 8 months ago

Polyembryony is the production of two or more embryos in one seed, due either to the existence and fertilization of more than one embryonic sac or to the origination of embryos outside of the embryonic sac. (biology) The production of two or more embryos from a single fertilized egg. In plants, this phenomenon is caused either due to the fertilization of one or more than one embryonic sac or due to the origination of embryos outside of the embryonic sac. This natural phenomenon was first discovered in the year 1719 by Anton van Leeuwenhoek in Citrus plant seeds.

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In sterilisation method the slit part of fallopian tube and vasa deferentia are tied for what purpose do they are tied?

Posted by Harsh Pahuja 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Harsh Pahuja 6 years, 10 months ago

Not upto the mark.a

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ANSWER

What events do take place in a female reproductive system on inducing copper -T .

Posted by Harsh Pahuja 6 years, 10 months ago

CBSE > Class 12 > Biology

1 answers

Harsh Pahuja 6 years, 10 months ago

*Thickening of mucus plug to prevent the passage for sperm transport. *If still sperm transports it up to the fallopian tube and fertilisation takes place it prevents the implantation of the blastocyst to uterus. *Moreover it reduces the sperm motility and also helps in phagocytosis of sperms.

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