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    • Posted by Amit Kumar 8 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Anushka Singh 7 months, 1 week ago

    The sino-atrial (SA) node is a specialized bundle of neurons located in the upper part of the right atrium of the heart. The cardiac impulse originating from the SA node triggers a sequence of electrical events in the heart, thereby controlling the sequence of muscle contraction that pumps blood out of the heart. Since the SA node initiates and maintains the rhythmicity of the heart, it is known as the natural pacemaker of the human body.

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    • Posted by Moni K 8 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Amit Kumar 8 months, 3 weeks ago

    Homologous

    1Thank You

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    • Posted by Pooja Surliya 8 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Sumit Yadav 8 months, 3 weeks ago

    23650592723

    0Thank You

    Sumit Yadav 8 months, 2 weeks ago

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    Naveen Sharma 8 months, 3 weeks ago

    Sewage mainly includes human excreta and contains large amounts of organic waste and pathogenic microbes. Thus it is necessary that waste should be made less polluted before discharging into water bodies. The process of sewage treatment is explained in the following steps: a) Primary treatment - In this treatment, filtration and sedimentation process is applied to remove large and small particles. Filtration process removes the floating debris by passing it through mesh wire screens. Then sedimentation removes the soil and small pebbles. The sediment is known as primary sludge and the supernatant is known as primary effluent. The effluent then enters the secondary treatment. b) Secondary treatment - In this treatment, large aeration tanks containing primary effluent are constantly agitated with a continuous supply of air. Thus aerobic microbes grow vigorously consuming a major part of the organic effluent reducing biological oxygen demand (BOD) of the effluent. The sewage is then passed into the settling tank where bacterial flocs settle and now it is known as activated sludge. Some of the activated sludge is again passed into aeration tank to serve as inoculum while rest of it enters into large tanks called anaerobic sludge digesters. Here anaerobic bacteria grow to produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide to form biogas. This effluent can then be released into natural water bodies

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    • Posted by Shagufta Yasmeen 8 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 4 answers

    Rekha Rekha 8 months, 3 weeks ago

    Function unit. Of dna

    0Thank You

    Afrin Khan Maheros 8 months, 3 weeks ago

    Gene is genetic character

    0Thank You

    Pragyan Baby 8 months, 3 weeks ago

    Panting of dna

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    Himanshu Raj Anand 8 months, 3 weeks ago

    Gene is something which code for traits

    1Thank You

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    • Posted by Sarthak Chandola 8 months, 4 weeks ago

    CBSE > Class 12 > Biology
    • 2 answers

    Shipha Mairisha 8 months ago

    The removal of introns from mRNA is termed as splicing

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    Neha Thakur 8 months, 1 week ago

    To separate unwanted introns from mrna

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    • Posted by Shivank Rathore 8 months, 4 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Shipha Mairisha 8 months ago

    A male gametophyte, which is haploid in nature and also called as microspore which is produced from microsporangium.

    0Thank You

    Rekha Rekha 8 months, 3 weeks ago

    As anther mature and dehydrate the. Microspore

    0Thank You

    Shagufta Yasmeen 8 months, 3 weeks ago

    Pollen grain is male gametophyte , haploid and made from Microspore....

    4Thank You

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    • Posted by Yoki Kavi 9 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Nitin Tawda 9 months ago

    If the length of E. coli DNA is 1,360 microns then the number of base pairs in this DNA is 4×106.

    3Thank You

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    • Posted by Anshika Puri 9 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Nitin Tawda 9 months ago

    In the presence of antibiotic, the bacteria that are sensitive to it will die. However, if there are any mutants in the population, that can somehow survive its effect, they will multiply and increase in numbers. After that they will live as new species of antibiotic resistant bacteria.

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    • Posted by X A 9 months ago

    CBSE > Class 12 > Biology
    • 0 answers
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    • Posted by Chintu Raj 9 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Anushka Singh 7 months, 1 week ago

    • It is uncurable • It's vaccine was prepared by genetic engineering

    0Thank You

    Ayush Dixit 9 months ago

    It is a disease that makes the urine yellow colur

    1Thank You

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    • Posted by Ruhani Arora 9 months, 1 week ago

    CBSE > Class 12 > Biology
    • 3 answers

    Shagufta Yasmeen 8 months, 3 weeks ago

    (C ) LNG - 20 because hormonal IUDs require to hostile cevux for sperm....

    1Thank You

    Sonia Sharma 9 months ago

    Cu-T

    1Thank You

    Shilpa Devi 9 months, 1 week ago

    A

    2Thank You

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    • Posted by Diksha Foujdar 9 months, 1 week ago

    CBSE > Class 12 > Biology
    • 1 answers

    Shagufta Yasmeen 8 months, 3 weeks ago

    Formation of mature female gametes at embryonic developmental stages...

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    • Posted by Krish Singh 9 months, 1 week ago

    CBSE > Class 12 > Biology
    • 2 answers

    Rohit Kumar 7 months, 4 weeks ago

    Zift means zygote intra fallopian transfer, in which we put fertilised zygote in to female ;Gift means gamete intra fallopian transfer, in which we put ova into female body

    0Thank You

    Himanshu Raj Anand 8 months, 3 weeks ago

    Zift : zygote intra fallopian transfer GIFT: Gamete intra fallopian transfer. In 1st one we put fertilised zygote into female and in 2nd one we put ova into female body

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    • Posted by Aditi Thapa 9 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Vijay Kumar 7 months, 2 weeks ago

    When there is representation of both alleles

    0Thank You

    Shipha Mairisha 8 months ago

    When both alleles dominance and recessive together express themselves in the offspring is called co dominance. Example :- ABO blood grouping

    0Thank You

    Madhu Pandey 9 months, 2 weeks ago

    Both allel parent vene has heterozygous

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    • Posted by Chanchal M 9 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 2 answers

    Shagufta Yasmeen 8 months, 3 weeks ago

    And it produce many seeds and complete it's cycle in one season ...

    0Thank You

    Akansha Rawat 9 months, 2 weeks ago

    Because it has short life span. Can done self pollination and cross pollination. Contrasting traits

    2Thank You

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    • Posted by Vaibhav Sharma 9 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Himanshu Raj Anand 8 months, 3 weeks ago

    Vaccination is an process which leads to immunisation. Vaccination: Introduction of dead mirobes into body Immunisation: response of body toward vaccine

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    • Posted by Ashi Tha 9 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Anushka Singh 7 months, 1 week ago

    the cell or group of cells from which spore mother cells develop

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    • Posted by Poonam Balwada 9 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Anushka Singh 7 months, 1 week ago

    In society 4 points of significance of reproductive health are as follows: -Reproductive health is vital in the prevention and control of sexually transmitted diseases such as AIDS, HIV, etc. -Population control and unwanted pregnancies can be avoided. -Awareness about pre and post maternal care and proper medications. -Better *** education spreading awareness about contraception, misconceptions, etc.

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    • Posted by Priya . 9 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Simran Khanduri 9 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Swati Yadav 9 months, 2 weeks ago

    Inner most layer of microsporangium... Which provide nutrition to microspore

    1Thank You

    Punit Yaduvanshi 9 months, 3 weeks ago

    It is the inner most layer of microsporangium it provide nutrition to the microspores

    5Thank You

    Kritika Kritika 9 months, 3 weeks ago

    Tapetum is the innermost layer of cells found in the anther. It plays a role in providing nutrition for the microspores present in the anther.

    4Thank You

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    • Posted by Mohammed Munaf 9 months, 3 weeks ago

    CBSE > Class 12 > Biology
    • 2 answers

    Punit Yaduvanshi 9 months, 3 weeks ago

    Because male honey(drone) bee is genetically haploid and it is produced from parthenogenesis

    1Thank You

    Yati Sood 9 months, 3 weeks ago

    Because male honeybees genetically haploid and female honeybees genetically diploid in condition

    0Thank You

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    • Posted by Pawan Singh Gour 9 months, 4 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Rohit Kumar 7 months, 4 weeks ago

    Ligase is an restrictions enzyme, that help in joining the fragments of DNA

    0Thank You

    Shipha Mairisha 8 months ago

    Ligase is a enzyme which catalyse the joining of fragments of replicated DNA.

    0Thank You

    Ꭾꮢꭺꭰꭼꭼꭾ Lodha 9 months, 3 weeks ago

    The ligase is a bacteria of biochemistry, a ligase is an enzyme that can catalyze the joining of two molecules by forming a new chemical bond. This is typically via hydrolysis of a small pendant chemical group on one of the molecules, typically resulting in the formation of new C-O, C-S, or C-N bonds.

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    • Posted by Khali Jindal 9 months, 4 weeks ago

    CBSE > Class 12 > Biology
    • 1 answers

    Mansi Nautiyal 9 months, 2 weeks ago

    The blastocyst stays in their uterus for several days before it implants in the inner lining of their uterine wall (endometrium). It continues to make new cells, which separate into layers. About 10 to 12 days after fertilization, the blastocyst develops into an embryo.

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    • Posted by Ronny Singh 10 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Rohit Kumar 7 months, 4 weeks ago

    To mentain their species on the earth

    0Thank You

    Punit Yaduvanshi 9 months, 3 weeks ago

    To continue their species in next generation on earth

    0Thank You

    Krishna Achu 9 months, 4 weeks ago

    To continue their species on earth so that they doesn't get extinct

    0Thank You

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    • Posted by Rakhi Yuvnati 10 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Tanvi Sharma 10 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Aniket Singh 10 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Saffron Samari 10 months ago

    13

    1Thank You

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    • Posted by Simran Khanduri 10 months, 1 week ago

    CBSE > Class 12 > Biology
    • 2 answers

    Mansi Nautiyal 9 months, 2 weeks ago

    Rana tigrina

    1Thank You

    Oceen Chauhan 10 months ago

    Rana tigrina

    3Thank You

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    • Posted by Vaishu Ram 10 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 3 answers

    Punit Yaduvanshi 9 months, 3 weeks ago

    Artificial technology

    0Thank You

    Pawan Singh Gour 10 months, 1 week ago

    Spermetogenesis

    1Thank You

    Pawan Singh Gour 10 months, 1 week ago

    Can you explain the IUT technology in chater 3

    2Thank You

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    • Posted by Sathana Mp 10 months, 2 weeks ago

    CBSE > Class 12 > Biology
    • 2 answers

    Hitesh Raj Yadav 9 months, 2 weeks ago

    Hershey and chase = they infected E.coli with bacteriophage and used radioactive sulphur ,radioactive phosphorus and the step were infection, blending, centrifugation and As the DNA contain phosphorus and protein contain sulphur. So at last after all steps they got DNA contained phosphorus, which shows that the DNA is transferred not protein. 

    Hence it was unequivocal proof that DNA is the genetic material. 

    0Thank You

    Devesh Pratap Singh 10 months ago

    Harshey and chase experiment about- Unequivocal proof of genetic material come from work of harshey and chase

    0Thank You

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