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Becoz papaya n date palm contain both male n female reproductive structures on different plants(unisexual) Whereas in cucurbits n coconut both male n female reproductive structures in the same plant(bisexual).

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Sangitaben Patel 7 years, 1 month ago

In dioecious plants....flowers as well as the plant is unisexual( have only one ***) In monoecious plants....flowers are unisexual but the plant is bisexual i.e. plants has both types of flowers(male and female) but these flowers are unisexual

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Mention one positive and one negative application of amniocentesis

Posted by Payal Singh 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 1 month ago

Positive application : It helps to detect any genetically controlled congential disease or any metabolic disorders in foetus.
Negative application : People use this method for female foeticide.

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Lac operon functions

Posted by Priyanshu Mishra 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Tty Vvh 7 years, 1 month ago

The lac operon (lactose operon) is an operon required for the transport and metabolism of lactose in Escherichia coli and many other enteric bacteria. Although glucose is the preferred carbon source for most bacteria, the lac operon allows for the effective digestion of lactose when glucose is not available through the activity of beta-galactosidase.[1] Gene regulation of the lac operon was the first genetic regulatory mechanism to be understood clearly, so it has become a foremost example of prokaryotic gene regulation.

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How to learn chapter 6 biology..

Posted by Mansi Sharma 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Tty Vvh 7 years, 1 month ago

As u firstly prepared psychological , then read notes along with only NCERT bio not other ....other book may confuse you......

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ANSWER

Give examples to prove that microbes release gases during metabolism

Posted by Sofi Qureshi 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 8 months ago

The examples of bacteria that release gases during metabolism are:

(a) Bacteria and fungi carry out the process of fermentation and during this process, they release carbon dioxide. Fermentation is the process of converting a complex organic substance into a simpler substance with the action of bacteria or yeast. Fermentation of sugar produces alcohol with the release of carbon dioxide and very little energy.

(b) The dough used for making idli and dosa gives a puffed appearance. This is because of the action of bacteria which releases carbon dioxide. This CO2 released from the dough gets trapped in the dough, thereby giving it a puffed appearance.

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What is chemical nature of antigens?

Posted by Harbans Sekhon 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Preeti Dahiya 7 years, 1 month ago

Proteinaceous☺️

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What is natural selection? Explain it with an example.

Posted by Harsh Jangra 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Virat Gumber 7 years, 1 month ago

According to Darwin's theory,natural selection refers to survival of the fittest. Example : take two beakers A and B.both had some bacteria with same environmental conditions.But after few says their environmental conditions change and the one who is capable of ACCALMATISING survives.hence,survival of the fittest

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What is impact and mitigation

Posted by Akash Deep 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

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Features of testis

Posted by Tsering Yangzom 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years, 8 months ago

The main function of the testes is producing and storing sperm. They're also crucial for creating testosterone and other male hormones called androgens. Testes get their ovular shape from tissues known as lobules. Lobules are made up of coiled tubes surrounded by dense connective tissues. They are typically 2 inches (5 centimeters) long, 1.2 inches (3 cm) wide and 1 inch (2.5 cm) thick. The ******* is a loose sack of skin that protects the testicles and acts as a climate control system. The testes must be at a temperature slightly cooler than the body temperature for normal sperm development.

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Practical Density frequency

Posted by Dalpat Meghwal 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

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Cam pathway

Posted by Thakur Dev Pratap Singh Chauhan 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

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Seastar belongs to phylum?

Posted by Madgonda Varade 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Ascaris phylum

Posted by Ritu Shekhawat 7 years, 1 month ago

CBSE > Class 12 > Biology

3 answers

Seema Gupta 7 years, 1 month ago

Phylum

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Seema Gupta 7 years, 1 month ago

Yes

1Thank You

Ritu Shekhawat 7 years, 1 month ago

Ascahelmanthes

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Pls tell me what type of question will be coming for practical viva for three subjects .??? What to read for those viva questions.???

Posted by Jayaasrii?? Jayaasrii 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Papa . 7 years, 1 month ago

Questions will be mostly based on the investigatory project you have done and the experiment you got for major, minor and spotting.. They may ask you questions from the record note also...

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ANSWER

Weightage of marks

Posted by Navneet Navi 5 years, 11 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

What is chalmydia and gonorrhea diseases?

Posted by Shaista Siddiqui 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 7 years, 1 month ago

Chlamydia, the most prevalent bacterial STI in the United States, is the result of the Chlamydia trachomatis bacterium, which can infect the urethra (bladder opening) and cervix (uterus opening). It is common in youngsters aged fifteen to nineteen. The disease is easily treated, but like other sexually transmitted infections, chlamydia tends to be silent and therefore go undiagnosed until it becomes more serious than in its early stages. Three in four women and one in two men have no symptoms. In 40 percent of cases, by the time a girl seeks medical attention, the disease has progressed to pelvic inflammatory disease (PID, described below), a major cause of female infertility and pelvic pain.

Gonorrhea : Chlamydia infection is sometimes confused with gonorrhea, another bacterial infection transmitted through vaginal and **** intercourse, and oral ***. Not only do they share many of the same symptoms, the two diseases can occur together.

Gonorrhea usually begins in the urethra (bladder opening) or the cervix. However, the rapidly proliferating Neisseria gonorrhoea bacterium can migrate to the uterus and the fallopian tubes, giving rise to pelvic inflammatory disease (PID). The infection, like chlamydia, may also involve the rectum.

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What is poikilothermal animals it is in bio ncert class 12

Posted by Meenu Kaushik 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Anki Kaushik 7 years, 1 month ago

The animals whose interal temperature varies considerably.

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Agrobacterium Tunefaciens is widely used for gene transfer justify your answer

Posted by Aayushi Dhahana 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Anki Kaushik 7 years, 1 month ago

It's not Tunefaciens, It's tumifaciens. Agrobacterium tumifaciens is a pathogen of several dicot plants which exhibit natural genetic engineering in plant. ✓It is able to deliver a piece of DNA called " T-DNA" to transform normal plant cell into a tumor cell. ✓The DNA transform the normal cells into tumor cells which direct them to produce the chemical essential for the pathogen.

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Why Syphilis occur?

Posted by Tanvi Chauhan 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Pragya Gupta 7 years, 1 month ago

Without proper contaceptive sexual intercourse with syphlatic person

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What is diabetes

Posted by Tamanna Mansharamani 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Pragya Gupta 7 years, 1 month ago

The glucose level in blood become high where enough insulin does not produce by beta cell of pancreas

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What is cytological?

Posted by Sumit Ingale 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Priyanshu Mishra 7 years, 1 month ago

It is a barrier which helps in protecting from the pathogen.

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Transcription

Posted by Mohd Adnan 7 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Tanisha Choudhary 7 years, 1 month ago

Transcription is the process in which DNA converts into RNA .

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Pragya Gupta 7 years, 1 month ago

The process of coverting dna into rna by the enzyme dna polymerase

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In what way the plant get benefited from the mycorrhizal symbiotic relationship? Give any 3 benefits.

Posted by Anamta Ayaz 7 years, 1 month ago

CBSE > Class 12 > Biology

1 answers

Pragya Gupta 7 years, 1 month ago

Inrease surfac rea to grow 2 increase use of miniral and nutrients 3 help plant bcome more tollerent accn to enviroment

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ANSWER

Name any two varieties of cheese and mention the names of microbes used

Posted by Aish Rajawat 7 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Anki Kaushik 7 years, 1 month ago

Roquefort cheese is produced by Penicillium Roqueforti.

1Thank You

Yogita Ingle 7 years, 1 month ago

The large holes in ‘Swiss cheese’ are due toproduction of a large amount of CO₂ by a bacterium named Propionibacterium sharmanii. The ‘Roquefort cheese’ are ripened by growing a specific fungi on them, which gives them a particular flavour.

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List the type of cry genes that provide resistance to corn plants and cotton plants respectively against lepidopterans

Posted by Aish Rajawat 5 years, 11 months ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Bio practical exam questions

Posted by Naubi Singha 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Describe gatrulation in detail

Posted by Danish Quamar 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Name compound play important role in prebiotic evolution

Posted by Amit Kumar 7 years, 1 month ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Why is the polar region not a suitable habitat for tiny humming birds

Posted by Mamta Sahu 7 years, 1 month ago

CBSE > Class 12 > Biology

2 answers

Kanwar Brar 7 years, 1 month ago

large surface area to volume ratio in accordance to Bergman's rule heat loss is more while maintaining homesites

1Thank You

Nikky Saxena 7 years, 1 month ago

The surface area of humming bird is so large as compared to volume of its body so it will lose heat more readily and fastly but generating heat for them is very expensive and time consuming process in that conditions . So the polar region is not suitable for them

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