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    • Posted by Rajandra 123 Kumbhkar 456 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Shobikaa Ravikumar 6 years, 7 months ago

    Honey bee. Male honey bee (drone): haploid body (as it is developed by parthenogenesis) Female honey bee (Queen and worker) : diploid body (developed from zygote).

    2Thank You

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    • Posted by Sudhir Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Tanya Mishra 6 years, 7 months ago

    primary Endospermic Cell it is formed after triple fusion

    1Thank You

    Sia ? 6 years, 7 months ago

    PEC is an industry leading, risk-management company that provides a technology-enabled contractor management service for reporting and measuring contractor risk, safety and compliance information to owner clients (operators).

    0Thank You

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    • Posted by Kaushal Rawat 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Neymar Arya 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    • Female Reproductive System:

    The human female reproductive system consists of:

    (i) Ovaries - These are the primary reproductive organs in women. They are oval shaped organs which are inside the abdominal cavity of a woman near the kidneys and produces mature female *** cells called ova or eggs. They also produce female *** hormones called Oestrogen and Progesterone. Each ovary is composed of several thousand follicles which mature to form ripe eggs at puberty.

    (ii) Oviduct - These are paired tubes which have funnel shaped openings that cover the ovaries. The ovum released by an ovary goes into the oviduct through its funnel shaped opening. The fertilisation of egg by a sperm takes place in it. It is also known as fallopian tube.

    (iii) Uterus - It is a bag like organ in which the fertilised egg develops into a baby. It is connected through a narrow opening called cervix to another tube called ******. It is commonly called womb.

    (iv) ****** - It is a tubular structure. It receives the ***** for putting sperms into the women's body. It is also called birth canal because it is the passage through which the baby is born.

    When a girl is born, the ovaries already contain thousands of immature eggs. On reaching puberty, some of these start maturing. One egg is produced every month by one of the ovaries. The egg is carried from the ovary to the womb through a thin oviduct or fallopian tube. The two oviducts unite into an elastic bag-like structure known as the uterus. The uterus opens into the ****** through the cervix. The sperms enter through the vaginal passage during sexual intercourse. They travel upwards and reach the oviduct where they may encounter the egg. The fertilised egg, the zygote, gets implanted in the lining of the uterus, and starts dividing.

    The release of an ovum from an ovary is called ovulation. In human females, the ovaries start releasing ovum once every 28 days from the age of puberty. Fertilisation is possible if mating takes place during the middle of menstrual cycle because in a normal healthy girl the ovulation takes place on the 14th day of the beginning of menstrual cycle of 28 days. The embedding of embryo in the thick lining of the uterus is called implantation.

    The lining thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition from the mother’s blood with the help of a special tissue called placenta.

    Placenta is a disc like special tissue which develops between the uterus wall and the embryo after implantation. Its function is the exchange of nutrients, oxygen and waste products between the embryo and the mother. It contains villi on the embryo’s side of the tissue. On the mother’s side are blood spaces, which surround the villi. This provides a large surface area for glucose and oxygen to pass from the mother to the embryo. The developing embryo will also generate waste substances which can be removed by transferring them into the mother’s blood through the placenta. The time period from the fertilisation up to the birth of a baby is called gestation. The average gestation period in humans is about 9 months (about 38 weeks).The child is born as a result of rhythmic contractions of the muscles in the uterus.
     

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    • Posted by Yaduvir Singh Si 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Himam Jani 6 years, 7 months ago

    Meiosis is the type of cell division results in offspring having chromosome half to that of parent.it results in production of 4 daughter cells. Mitotic is the division in which offspring have same no of chromosome to thst of parent.it results in production of 2 daughter cells.

    2Thank You

    Afroj Rose 6 years, 7 months ago

    Meiosis involve not in one but involve in two cell division and mitotic division involved in germ cell or reproductive cell

    1Thank You

    Himanshu Kumar 6 years, 7 months ago

    *** cell and other cell

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    • Posted by Tushar Gautam 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Arjun Kumar Yadav 6 years, 7 months ago

    Spore formation is a type of asexual reproductin in which new plant is produces from the flagellaus structure (spore ) of pre existing plants

    1Thank You

    Afroj Rose 6 years, 7 months ago

    It is a type of asexual reproduction in this the small smores produce a new plants

    1Thank You

    Yaduvir Singh Si 6 years, 7 months ago

    It is a type of asexual reproduction occur in flowering plants such as fungi and bacteria . In this method hundreds of tiny spores become new plants .

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    • Posted by Zoya Niyaziya 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Afroj Rose 6 years, 7 months ago

    The production of seed without fertilization is called parthenogenesis

    1Thank You

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    • Posted by Siya Prasad 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Adarsh Deep 6 years, 7 months ago

    Yes

    0Thank You

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    • Posted by Pankti Jais.... 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Aysha Enami 6 years, 7 months ago

    It is the phase when an individual organism reproduces sexually. In plant the flowering shows reproductive phase. In human the onset of menstrual cycle and formation of sperm shows reproductive phase.

    2Thank You

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    • Posted by Shriansh Singh 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Anjali Kumari 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Nk Jk 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Shiva Goyal 6 years, 7 months ago

    Okazaki fragments are joined by ligase not by helicase

    0Thank You

    A R Vhasnsciani 6 years, 7 months ago

    Since the lagging strand runs from 5' to 3', dna dependent dna polymerase cannot replicate the dna. Therefore it forms short fragments of dna called okazaki fragments which are later joined by the dna helicase. That is why replication is called as a discontinuous one on the lagging strand.

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    • Posted by Shalu Gupta 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Shalu Gupta 5 years, 8 months ago

    Immortals

    4Thank You

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    • Posted by Ushashi Chowdhury 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Shobikaa Ravikumar 6 years, 7 months ago

    Seed without endosperm is produced

    1Thank You

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    • Posted by Sumit Chaurasiya 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 4 answers

    Prashant Bhardwaj 6 years, 7 months ago

    Oxytocin and relaxin are the birth hormones oxytocin gives powerful contraction whereas relaxin relaxes pelvic muscles

    1Thank You

    Sinchana Malagond 6 years, 7 months ago

    Its is also involved in contraction during labor.

    1Thank You

    Sinchana Malagond 6 years, 7 months ago

    No, Oxytocin is known as the birth harmone and is involved in the function of lovemaking, emotions fertility etc..

    2Thank You

    Shobikaa Ravikumar 6 years, 7 months ago

    Oestrogen

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    • Posted by Sourabh Bhaira 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Shobikaa Ravikumar 6 years, 7 months ago

    DNA is comparatively more stable than RNA. RNA is more reactive due to the presence of free OH group and also undergoes more mutations than DNA.

    1Thank You

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    • Posted by Nabanita Dey2002 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    Artificial selection, also called "selective breeding”, is where humans select for desirable traits in agricultural products or animals, rather than leaving the species to evolve and change gradually without human interference, like in natural selection. Selective breeding leads to future generations of selectively bred plants and animals, all sharing very similar alleles which will reduce variation. Genes and their different alleles within a population are known as its gene pool .

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    • Posted by Gurleen Kaur 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Nabam Taga 6 years, 7 months ago

    Dont know

    1Thank You

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    • Posted by Priya Pujari 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Prashant Sharma 6 years, 7 months ago

    Umbilical cord have undeferentiated cell so after delivery it shoud not be thrown it should be kept in preservation so if any case of organ failure in future of the fetus so we can use that umbilical cord as organ by giving it a cell of that particular organ and that umbilical cord became the organ which we required..as umbilical cord is undeferentiated.

    1Thank You

    Souromi Chatterjee 6 years, 7 months ago

    Umbilical cord connencts the foetus with tha mother through placenta.. it helps in excretion of waste materials from the foetus provides nutrition to it from the mother..

    1Thank You

    Ujjawal Yadav 6 years, 7 months ago

    To Excreate The Waste Waste Material Of Foetus

    1Thank You

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    • Posted by Manpreet Suneja 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Manpreet Suneja 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

    Alok Singh 6 years, 7 months ago

    Apna results bhej sakte ho

    0Thank You

    Alok Singh 6 years, 7 months ago

    Kitna subject tha

    0Thank You

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

    Don't know

    0Thank You

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    • Posted by Narinder Khajuria 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Aysha Enami 6 years, 7 months ago

    Because inside the ovary of angiosperm plant 7 cell and 8 nucleus are present.

    1Thank You

    Ujjawal Yadav 6 years, 7 months ago

    Not Perfect Answer

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    • Posted by Zaid Rana 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 3 answers

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

    Heterothallic species have sexes that reside in different individuals.the term id applied particularly to distinguish heterothallic fungi which requires two compatible partners to produce sexual spore from homothallic ones which are capable of sexual reproduction from a single organism

    0Thank You

    Aysha Enami 6 years, 7 months ago

    If male and female reproductive part present different from each other then it is called heterothallic or unisexual or diescious.

    0Thank You

    Sinchana Malagond 6 years, 7 months ago

    In several species of fungi and plants heterothallic is a term used to denote unisexual condition.

    2Thank You

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    • Posted by Arpita Ghildiyal 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sinchana Malagond 6 years, 7 months ago

    The Museum is simply known as reverse transcription. It was discovered by Temen and Baltimore. According to Temenism, RNA can act as template for DNA formation i.e., DNA can be synthesized by RNA.

    1Thank You

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    • Posted by Namita Singh 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Sinchana Malagond 6 years, 7 months ago

    Mosses and liverworts are non vascular plants and not have completely developed vascular transport system. They can only survive in moist and marshy areas. In dry conditions there will be no water to carry sperms to eggs and hence these plants fail to reproduce sexually.

    1Thank You

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    • Posted by Pawan Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Pankaj Panwar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Arpita Ghildiyal 6 years, 7 months ago

    It is a pehnomenon to be habitual of taking substances that enhance ones metabolism n makes an individual to lose his control over his brain

    2Thank You

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    • Posted by Aastha Jain 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 1 answers

    Meghna Thapar 5 years, 5 months ago

    Vegetative propagation or asexual propagation is the method of reproducing plants with the use of organs other than the seed and spore.  Artificial vegetative propagation is a type of plant reproduction that involves human intervention. The most common types of artificial vegetative reproductive techniques include cutting, layering, grafting, suckering, and tissue culturing.

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    • Posted by Sudhir Kumar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 0 answers
    ANSWER

    • Posted by Narendra Singh Panwar 6 years, 7 months ago

    CBSE > Class 12 > Biology
    • 2 answers

    Shobikaa Ravikumar 6 years, 7 months ago

    Skin, mucous in gastro intestinal tract, saliva in mouth, hydrochloric acid in stomach, mucous in respiratory tract, etc.

    0Thank You

    Sinchana Malagond 6 years, 7 months ago

    Skin gastrointestinal tract,cilia, respiratory tract etc..

    1Thank You

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