No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

    • Posted by Anoop Singh 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Naveen Kumar Sharma 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Naveen Kumar Sharma 6 years, 8 months ago

    Please can you explain in single sentences its significance

    0Thank You

    Naveen Kumar Sharma 6 years, 8 months ago

    did not get it

    0Thank You

    Yogita Ingle 6 years, 8 months ago

    External genitalia-

    • The ***** is the male external genitalia.
    • Some special tissues make up the ***** which helps in the erection of the *****.
    • The enlarged end of ***** called the glans *****.
    • Foreskin, a loose fold of tissue covers the glans *****.

    2Thank You

    ANSWER

    • Posted by Shubham Saini 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    K@Łp@N@ $Øđh!?? 6 years, 8 months ago

    Transposons also called a jumping genes are the gene sequence present in the genome of eukaryotic cells that can jump to different locations within a genome. These cause RNA interference by silencing specific sequence of DNA and is used as a method of cellular defense of eukarypotic cells

    1Thank You

    Yogita Ingle 6 years, 8 months ago

    Transposons also called as jumping genes are the gene sequences present in the genome of eukaryotic cells that can jump to different locations within a genome. These cause RNA interferance (RNAi) by silencing specific sequence of DNA and is used as method of cellular defense by all eukarypotic cells.
    Transposons that replicate via  RNA intermediate are called retrotransposon. Retrotransposons are the types of transposons that copy themselves to RNA and then back to DNA  so that it may integrate back to the genome.
    Transposons that replicate via  RNA intermediate are called retrotransposon. Retrotransposons are the types of transposons that copy themselves to RNA and then back to DNA  so that it may integrate back to the genome.

    0Thank You

    ANSWER

    • Posted by Abhishek Pal 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Aniket Dubey 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Nivedita Garg 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Nasima Khan 6 years, 8 months ago

    The plants which are pollinated by air pollination in these plants contain packed ovule and Stigma is found in cab and these Stigma are called tassels.

    2Thank You

    ANSWER

    • Posted by Priya Chugh 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    Welcome

    0Thank You

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    A typical angiosperm is bilobed with each lobe having two theca.hence,angiosperm anther called dithecious... Structure- it is circular and is generally surrounded by four wall layers.namely.,epidemise,enthocium,middle layer and tapectum.. I hope this ans is suitable..

    1Thank You

    Aniket Dubey 6 years, 8 months ago

    Please go through ncert page 21 .

    0Thank You

    ANSWER

    • Posted by Shreya Kumari 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    There is a ans may be it helps u... The parent cell simply divides to form two daughter cells that r identical to the parent.. In many other organisms, two parents r involved ,and the offspring r not identical to the parents . In fact ,each offspring is unique..?

    0Thank You

    ANSWER

    • Posted by Shobikaa Ravikumar 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Gaurav Seth 6 years, 8 months ago

    Human Reproduction, Class 12, Biology

    Ameiotic Thelytoky - In this type of parthenogenesis, during oogenesis first meiotic division does not take place but second meiotic division occurs as usual. In this situation the ovum still remains diploid. These ova, when reproduce parthenogenetically give rise to diploid off springs. For example, Trichoniscus, Daphnia, Daphnia pulex etc.

    0Thank You

    ANSWER

    • Posted by Durgaprasad Kar 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Saheli Halder 6 years, 8 months ago

    Autogamy is discouraged as it is a mode of self pollination, which brings about negligible genetic variation. Adaptations to ensure xenogamy are:- Unisexuality Dicliny-reproductive parts dont mature at the same time. Heterostyle- In a bisexual flower stamen and carpel occurs in different length which prevent self pollination. Chasmogamy- the flowers open earlier.

    1Thank You

    ANSWER

    • Posted by Abhishek Bonal 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Abhishek Bonal 6 years, 8 months ago

    Goggle kar lengey

    0Thank You

    ANSWER

    • Posted by ▪▪Amrit▪▪ ❤ 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 5 answers

    Kashish Dogra 6 years, 8 months ago

    No.its not necessary bcz no body can intrested to read extra things which we added there is an answere key from which teachers were checking our papers so i think there is no need to write this thing and try to mention that thing which is asked by examiner☺

    1Thank You

    ꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 8 months ago

    Mera bhi message dekh le. .....samne se to me hi bat karti hu...??

    1Thank You

    Ďãřşháñăã Yadav ? ? ? ✊ 6 years, 8 months ago

    yes it's necessary.... but iska mtlb ye nhi ke abb tum hospital ke chakar lagnae lag jao .. ? ? ? Google par report hai le skte ho vaha se . becoz mera v project Ebola disease par tha mujhe khud victims report likhni hai it's available on Google so, might be cancer report v hogi he.

    3Thank You

    Saumya Chaubey 6 years, 8 months ago

    Ni

    1Thank You

    ▪▪Amrit▪▪ ❤ 6 years, 8 months ago

    please tell me

    1Thank You

    ANSWER

    • Posted by Navjot Kaur 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    ▪▪Amrit▪▪ ❤ 6 years, 8 months ago

    ability of pollen to germinate in certain time period

    1Thank You

    Nasima Khan 6 years, 8 months ago

    The time period in which pollen grains are functionally active known as pollen viability

    1Thank You

    ANSWER

    • Posted by Jasmine Jasmine 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 8 months ago

    Hormonal control of spermatogenesis

    • Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH) from hypothalamus.
    • The increases level of gonadotropin releasing hormone stimulates the anterior pituitary to secrete luteinizing hormone(LH) and follicle stimulating hormone(FSH).
    • LH acts at the Leydig cells and stimulates synthesis and secretion of androgens.
    • Androgens stimulate the process of spermatogenesis.
    • FSH acts on the Sertoli cells and secrete two factors- androgen binding protein (ABP) and inhibin which helps in spermiogenesis.

    0Thank You

    ANSWER

    • Posted by Saheli Halder 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 8 months ago

     Ameiotic Thelytoky- In this type of parthenogenesis, during oogenesis first meiotic division does not take place but second meiotic division occurs as usual. In this situation the ovum still remains diploid. These ova, when reproduce parthenogenetically give rise to diploid offsprings. For example, Trichoniscus, Daphnia pulexetc.

    1Thank You

    ANSWER

    • Posted by Anisha Sharma 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Aniket Dubey 6 years, 8 months ago

    3

    0Thank You

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    Radioactive waste ??

    0Thank You

    ANSWER

    • Posted by Navjot Kaur 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Gaurav Seth 6 years, 8 months ago

    Answer: Tobacco Mosaic Virus (TMV) uses RNA as their genetic material.

    1Thank You

    ANSWER

    • Posted by Anisha Sharma 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 7 answers

    Ashif Ali 6 years, 8 months ago

    Aids , cancer or biotecnology

    0Thank You

    Naveen Kumar Sharma 6 years, 8 months ago

    Contraceptive method

    0Thank You

    Naveen Kumar Sharma 6 years, 8 months ago

    single cell protein

    0Thank You

    Dhamani Jangral 6 years, 8 months ago

    You may also choose embryo development in humans

    0Thank You

    Gopal Singh 6 years, 8 months ago

    You may choose drug addiction

    0Thank You

    Mansi Jadoun☺☺☺ 6 years, 8 months ago

    You can choose sewage treatment plant it's quits nice isn't it.

    0Thank You

    Anisha Sharma 6 years, 8 months ago

    In biology

    0Thank You

    ANSWER

    • Posted by Harshit Sharma 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Aniket Dubey 6 years, 8 months ago

    By carbon dating method.

    0Thank You

    ANSWER

    • Posted by Ashif Ali 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Niharika Kumari 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    Pollen grains have the same specific gravity as that of water. Therefore pollens can float below the surface of the water. When pollens reach the stigma, they coiled around it and germinate. Hydrophily is a fairly uncommon form of pollination whereby pollen is distributed by the flow of waters, particularly in rivers and streams. Hydrophilous species fall into two categories: (i) Those that distribute their pollen to the surface of the water. e.g. Vallisneria's male flower or pollen grain are released on the surface of the water, which are passively carried away by water currents; some of them eventually reach the female flower (ii) Those that distribute it beneath the surface. e.g. seagrasses in which female flower remain submerged in water and pollen grains are released inside the water.

    0Thank You

    ANSWER

    • Posted by Navjot Kaur 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Aniket Dubey 6 years, 8 months ago

    Acrosomase

    0Thank You

    Sayeda Iram Ateeq 6 years, 8 months ago

    Hyaluronidase!

    3Thank You

    ANSWER

    • Posted by Navjot Kaur 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Shashidhargoud Goudar 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Prashant Dogra 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 8 months ago

    Chargaff's rule states that DNA from any cell of any organism has a 1:1 ratio of pyrimidine and purine bases and, more specifically, that the amount of guanine, a purine base, is equal to cytosine, a pyrimidine base; and the amount of adenine, a purine base, is equal to thymine, a pyrimidine base.

    The rules of base pairing (or nucleotide pairing) are:

    • A with T: the purine adenine (A) always pairs with. the pyrimidine thymine (T)
    • C with G: the pyrimidine cytosine (C) always pairs with. the purine guanine (G)

    0Thank You

    ANSWER

    • Posted by Justin Bieber 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Sayeda Iram Ateeq 6 years, 8 months ago

    Hardy-Weinberg's principle , adaptive radiation, human evolution, natural selection(types and examples), embryology, molecular evidence and origin of life(all theories).....?almost all topics are important!!!???

    0Thank You

    Shashidhargoud Goudar 6 years, 8 months ago

    Sorry for this answer

    1Thank You

    Shashidhargoud Goudar 6 years, 8 months ago

    Different between crystalline and amorphous. number of particles in unit cell Packing efficiency in defination Packing efficiency of BCC.fcc.scc direvation And problems

    3Thank You

    ANSWER

    • Posted by Sushma Sharma 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    Chargaff's rules states that DNA from any cell of any organisms should have a 1:1ratio of pyrimidine nd purine bases...

    0Thank You

    ANSWER

    • Posted by Jasmine Khatun 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Srishti Choudhary ✍⏳ 6 years, 8 months ago

    monocot contains a single cotyledon in its embryo whereas dicot contains 2 cotyledons in its embryo....Monocots nd Dicots differ in their structure as well.. They have diff.types of stems ,roots,leaves,flowers,and seeds...

    0Thank You

    ANSWER

    • Posted by Avinash Yadav 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Kashish Dogra 6 years, 8 months ago

    May a person will suffer from AIDS bcz many types of infections are transfering in only one body

    0Thank You

    Nikita Kumari 6 years, 8 months ago

    May a person will be infected by stds

    0Thank You

    ANSWER

    • Posted by Mitali Jain 6 years, 8 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Nikita Kumari 6 years, 8 months ago

    And in them asexual reproduction occurs

    0Thank You

    Sia ? 6 years, 8 months ago

    The single cell organisms are said to be immortal because their progenies are exactly like them in the genetic make up. Offsprings are in fact the clones of their parents and full genetic composition is conserved.

    0Thank You

    ANSWER

    myCBSEguide App

    myCBSEguide

    Trusted by 1 Crore+ Students

    Install Now

    Test Generator

    Test Generator

    Create papers online. It's FREE.

    Try Now

    CUET Mock Tests

    CUET Mock Tests

    75,000+ questions to practice only on myCBSEguide app

    Install Now
    Google Play

    Download myCBSEguide App

    All Courses

    Other Websites

    CBSE Courses

    Resources

    Corporate

    NCERT Solutions

    CBSE Sample Papers

    All Content and Intellectual Property is under Copyright Protection | myCBSEguide.com ©2007-2026