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    • Posted by Sunitha Rajkumar 6 years, 6 months ago

    CBSE > Class 12 > Biology
    • 5 answers

    Amrita Mohanty 6 years, 6 months ago

    It is a branch of science

    0Thank You

    Nishu Goyal 6 years, 6 months ago

    Biology is the study of living

    0Thank You

    Vanshika Tyagi 6 years, 6 months ago

    Biology is a branch of science that study about living or non living organism

    0Thank You

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

    It is the study of biodiversity

    0Thank You

    Sunitha Rajkumar 6 years, 6 months ago

    Study of biodiversity

    1Thank You

    ANSWER

    • Posted by Dr. Rakesh Kumar 6 years, 6 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    In the central nervous system, axons are myelinated by oligodendrocytes, thus lack neurilemma. The myelin sheaths of oligodendrocytes do not have neurilemma because excess cytoplasm is directed centrally toward the oligodendrocyte cell body. Neurilemma serves a protective function for peripheral nerve fibers. The central nervous system consists of the brain and spinal cord. It is referred to as “central” because it combines information from the entire body and coordinates activity across the whole organism.

    0Thank You

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    • Posted by Gyan Prakash. 6 years, 6 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Disha Trivedi 6 years, 6 months ago

    1 microspore gives rise to 1 tetrad

    0Thank You

    Madhukar Dutt Tripathi 6 years, 6 months ago

    Tetrad.

    0Thank You

    Dr.Niraj Kumar 6 years, 6 months ago

    4 MMC

    0Thank You

    Dr. Rakesh Kumar 6 years, 6 months ago

    One microspore mother cell (MMC-2n) produces 4 haploid microspores or pollen grains by meiosis.

    1Thank You

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    • Posted by Sadhika Kumari 6 years, 6 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Krashnalal Chouhan 6 years, 6 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Nishu Goyal 6 years, 6 months ago

    Division of parent body into two or more than two daughter cell

    0Thank You

    Yogita Ingle 6 years, 6 months ago

    Fission means division. During asexual reproduction, the parent cell divides into two or more cells. Unicellular organisms show different patterns of cell division according to their cell structure. For example, an amoeba can divide itself into two at any plane but the division in euglena is longitudinal.
    Fission can be of two types, namely, binary fission and multiple fission. In binary fission, parent cell divides into two equal halves called daughter cells. Daughter cells are identical to each other and to their parent cell. Organisms like the amoeba, bacteria, euglena, etc., exhibit binary fission.
    During multiple fission, organism divides itself into numerous daughter cells. Examples of multiple fission are sporozoans and algae.

    1Thank You

    ANSWER

    • Posted by Reigns Media 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Dr. Rakesh Kumar 6 years, 6 months ago

    Primary sludge is generated by sedimentation of soil, dust and other impurities during primary treatment. The partially cleaned water is then subjected to secondary treatment where it is aerated. Aerobic bacteria, fungi and slime moulds grow and decompose organic matter. The sedimentation of aerobic bacteria generates activated sludge. This is also used as inoculum during next cycle.

    0Thank You

    ANSWER

    • Posted by Shivani Dubey 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Madhukar Dutt Tripathi 6 years, 6 months ago

    Pleitropic effect is termed as the ability of a gene to control more than one character. For example loss of proper sight along with albinism which is a combined effect generally observed , that comes up due to the malfunctioning of gene involved in control of both features.

    0Thank You

    Hritwik Raj 6 years, 7 months ago

    Pleiotropy refers to the condition where a single mutation causes more than more than one observable phenotypic effect or changes in characteristic.

    1Thank You

    ANSWER

    • Posted by Ankush Prajapati 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Ankush Prajapati 6 years, 6 months ago

    Thanks

    0Thank You

    Manika Gupta 6 years, 6 months ago

    DNA is a double helical structure made up of polypeptide chain . The 2 chains are made up of sugar(pentose) and phosphate . the 2 chains have antiparallel polarity , one has 5'-3' and another has 3'-5' the 2 strands are joined via bases. These bases are adenine(A) , guanine(G) , thymine(T) (uracil(U) in case of RNA) cytosine(C) . G triple bond C and A=T. These bonds are hydrogen bonds

    0Thank You

    Hritwik Raj 6 years, 7 months ago

    Structure of DNA is made of 2 polypeptide chain 2 chains have anti-parallel polarity with 5'-3' & 3'-5'

    1Thank You

    Pratham Gaur 6 years, 7 months ago

    Structure of DNA is double helix

    0Thank You

    ANSWER

    • Posted by Pratham Gaur 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 7 answers

    Pratham Gaur 6 years, 6 months ago

    Apis Mallifera is correct or not?

    0Thank You

    Harpreet Kaur 6 years, 6 months ago

    Apis indica

    1Thank You

    Amrita Mohanty 6 years, 6 months ago

    Gunjan means humming of bees

    0Thank You

    Nishu Goyal 6 years, 6 months ago

    Apis indica

    1Thank You

    Pratham Gaur 6 years, 7 months ago

    Mendel

    0Thank You

    Ankush Prajapati 6 years, 7 months ago

    Father of genetics

    1Thank You

    Ankush Prajapati 6 years, 7 months ago

    Structure of DNA

    1Thank You

    ANSWER

    • Posted by Satla Madavi 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 5 answers

    Madhukar Dutt Tripathi 6 years, 6 months ago

    Circulation can be defined as movement of body fluids in the intracellular locations, into the body cavity so as to transfer material( gases by diffusion, nutrition to cells, waste material for excretion) from place of origin to the place of usage or processing.

    0Thank You

    Vasu Sharma 6 years, 7 months ago

    It is the Process of flow of blood with some pressure from heart to other body part and vice vera

    0Thank You

    Hritwik Raj 6 years, 7 months ago

    It is process of circulation of body fluids like blood/plasma throughout the body parts.

    1Thank You

    Divya Garg 6 years, 7 months ago

    The flow of blood from heart to all parts of body nd vice versa is termed as circulation

    0Thank You

    Satla Madavi 6 years, 7 months ago

    What is circulation

    1Thank You

    ANSWER

    • Posted by Anushka Sen?? 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Madhukar Dutt Tripathi 6 years, 6 months ago

    These are successful tools in bio tech. Can be easily manipulated and structurally modified at genetic level to use them according to our benefits.

    0Thank You

    Hritwik Raj 6 years, 7 months ago

    BAC andYAC are used in HGP

    1Thank You

    ANSWER

    • Posted by Shikha Kashyap 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Nishu Goyal 6 years, 6 months ago

    Because in some plants there are no seeds to directly grow plant but by using simple cell for tissue culturing genetically similar plants can be formed in short time

    0Thank You

    Yogita Ingle 6 years, 7 months ago

    The plants obtained by micropropagation are called somaclones because they are genetically identical to each other as well as to parent plant.

    0Thank You

    ANSWER

    • Posted by Sakshi Solanki 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Sia ? 6 years, 7 months ago

    Mendel selected garden pea for his experiment for the following reasons-

    Easy to Cultivate: Pea plant (Pisum sativum) was easy to cultivate. It grew well in his garden. 

    Hermaphrodite: Its flowers were hermaphrodite I.e. pea plant have both male and female sexual organs.

    Cross-fertilization (Cross-Pollination) Easily Controlled: It was normally self-fertilizing (self-pollinating) that is the fertilization of plants and some invertebrate animals by their own pollen or sperm rather than that of another individual, but could also be cross fertilized (cross-pollinated) that is the transfer of pollen grains from an anther of a flower of one plant to a stigma of a flower of another plant of the same species. 

    Short Generation Time: As the time gap between generations was short, Mendel could raise many generations of pea within a short time. This is one of the main reason for choosing Pea plant (Pisum sativum). 

    Many Distinct Traits: Pea had many sharply distinct. its each trait had two clear cut alternative forms or varieties: e.g. seed shape had a round or wrinkled phenotype, plant height was either tall or short, seed color could be yellow or green etc. Mendel called them pair of contrasting traits. He focused on seven such contrasting pair of traits.

    3Thank You

    Deepesh Gulia 6 years, 7 months ago

    1 .Pure varieties of pea were available 2 .f1hybrid are fertile 3.a large no.seeds are produced per plant 4.pea flower normally remains closed and undergoes self -pollination..!

    0Thank You

    Pratham Gaur 6 years, 7 months ago

    1. Short life span 2. Show self pollination nd Cross pollination

    1Thank You

    Tanvi Toor 6 years, 7 months ago

    1. Easy to cultivate 2. Hermaphrodite 3. Shows distinct traits 4. Short life span ?

    1Thank You

    ANSWER

    • Posted by Komod Prasad 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Yogita Ingle 6 years, 7 months ago

    Some molecules produced by a certain living organisms perform functions in the body of other organisms and modify the metabolism.
    Hence, they are called bioactive molecules. Statins, and cyclosporin-A are bioactive molecules.

    2Thank You

    ANSWER

    • Posted by Shivam Singhania 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Amrita Mohanty 6 years, 6 months ago

    Haaaaaa joke of the year

    0Thank You

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

    Kaise krte ho magic

    0Thank You

    Tanvi Toor 6 years, 7 months ago

    ?

    0Thank You

    Vishakha Dixit 6 years, 7 months ago

    ?

    0Thank You

    ANSWER

    • Posted by Isha Garg 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Isha Garg 6 years, 6 months ago

    But we have to learn all the scientific names mentioned in textbook of class 11 and 12

    0Thank You

    ANSWER

    • Posted by Vinu Yadav 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Tarun Sorout 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Hritwik Raj 6 years, 6 months ago

    visit. cbseacademics.nic.in

    0Thank You

    ANSWER

    • Posted by Yakuza Shimatoro 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Nishu Goyal 6 years, 6 months ago

    First DNA replicate to produce templates . Than it undergo transcription to form mRNA .Than translation take place in which mRNA form protein .

    0Thank You

    ANSWER

    • Posted by Hritwik Raj 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Madhukar Dutt Tripathi 6 years, 6 months ago

    Foetal ejection reflex starts the positive feedback loop. It results in the release of oxytocin that induces uterine contractions that ultimately cause pituitary gland to release more oxytocin which is necessary for continuous uterine contractions for expulsion of the baby.

    1Thank You

    Himanshu Yadav 6 years, 7 months ago

    Foetal ejection reflex is a signal which arises by unborn baby and uterine cavity just before the parturition . A harmon oxytocin released by pituitary gland causes continuous contraction ans relaxation in uterine wall and parturition takes place

    1Thank You

    ANSWER

    • Posted by Hritwik Raj 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Manoj28675 Ht 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Nishu Goyal 6 years, 6 months ago

    Purine are two chain structure and pyrimidine are single chain structure when pairing take place in purine and pyrimidine which are complementary distance between two nucleotide become constant

    0Thank You

    Shivam Chaurasia 6 years, 7 months ago

    Because of phosphidiester bond providing strong attractional force between adjacent nucleotides.

    0Thank You

    ANSWER

    • Posted by Shantanu Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

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

    the formation of more than one embryo from a single fertilized ovum or in a single seed.

    0Thank You

    Hritwik Raj 6 years, 7 months ago

    Formation of more than one embryo in seedling

    2Thank You

    Aadi Ahluwalia 6 years, 7 months ago

    More than one embryo in a seed

    0Thank You

    Manoj28675 Ht 6 years, 7 months ago

    It is the occurance of more than one embryo in A seed . It occur in some species of citrus like orange lime .

    0Thank You

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    • Posted by Shantanu Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Hritwik Raj 6 years, 7 months ago

    Hydra reproduces asexually by budding or regeneration

    0Thank You

    Aadi Ahluwalia 6 years, 7 months ago

    Asexually

    0Thank You

    Shivam Chaurasia 6 years, 7 months ago

    Both by regeneration and budding.

    0Thank You

    Manoj28675 Ht 6 years, 7 months ago

    Hydra reproduce through asexually by external budding

    0Thank You

    ANSWER

    • Posted by Vidisha Kushwaha 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Gaurav Seth 6 years, 7 months ago

     

    Question: Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

    Answer

    Organisms such as fungi and algae switch to sexual mode of reproduction during adverse conditions because sexual reproduction brings variation into the individuals, some of which might help the individuals to adapt to the changed conditions and survive. This ensures the continuity of species.

    0Thank You

    ANSWER

    • Posted by Vivek Kakade 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 5 answers

    Amrita Mohanty 6 years, 6 months ago

    And analogy means having same function but different structure

    0Thank You

    Amrita Mohanty 6 years, 6 months ago

    Homology means having same structure but different function

    0Thank You

    Shivam Chaurasia 6 years, 7 months ago

    Homology means same anatomy but divertance in function so called divergent evolution. Analogy means different anatomy but same function( converges function) so also called convergent evolution.

    0Thank You

    K@Łp@N@ $Øđh!?? 6 years, 7 months ago

    Analogous structures have different evolutionary ancestries but they have the same function. Examples of these types of structures are the wings of birds, bats and insects. Homologous structures are the opposite; they have similar ancestries and common traits but maybe not have the same function in an organism.

    0Thank You

    Prafful Agrawal 6 years, 7 months ago

    Homology refers to the similarity in external morphology whereas analogy refers to the similarity in internal anatomy.

    0Thank You

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    • Posted by Kratika Mehta 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Kratika Mehta 6 years, 5 months ago

    Difference between biennial and annual plants

    1Thank You

    Nishu Goyal 6 years, 6 months ago

    Plant which show flowering or fruiting only once in their life cycle are called moncarpic. eg bamboo

    1Thank You

    Yogita Ingle 6 years, 7 months ago

    Monocarpic plants are those that flower only once in their lifetime. Once they flower, they produce seeds, and then die off. Examples - thouch-me-not pant, ragweed, winter wheat, etc.

    1Thank You

    Savitri Devi??? 6 years, 7 months ago

    The plants in which flowering and. fruiting takes place only once in the whole life cycle. Example : annual and biennial plants

    1Thank You

    ANSWER

    • Posted by Prashant Tomar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Nishu Goyal 6 years, 6 months ago

    It is the doubling ,tripling or multipling of basic set of chromosome

    0Thank You

    Shivam Chaurasia 6 years, 7 months ago

    PolyPloidy means more than 2 ploidy means multikaryon phase as occur during down syndrom.

    0Thank You

    Savitri Devi??? 6 years, 7 months ago

    It is the state of cell or organism having more than two paired sets of chromosomes coming from each parent. Example Peanut plant

    2Thank You

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    • Posted by Nilansha Srivastava 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Hritwik Raj 6 years, 6 months ago

    Alfred hershey on working on bactriophage proved that DNA is a genetic material

    0Thank You

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    • Posted by Kamlesh Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sia ? 6 years, 7 months ago

    Malaria is caused by the protozoan parasite Plasmodium. This disease spreads through the bite of an insect vector, i.e. the female Anopheles mosquito, which feeds on human blood.

    Symptoms of Malaria:

    (i) Sudden appearance of fever with pain and sensation of cold shivering.
    (ii) Temperature rises up to 106°F and patient feels burning hot, inter headache, faster breathing rate and heart beat.
    (iii) Fever later comes down with profuse sweating. This occurs either daily at a particular time or is repeated every third or fourth day depending upon the species of the parasite.
    (iv) Enlargement of spleen and anaemia occurs.

    1Thank You

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