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    • Posted by Abhishek Kala 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 4 answers

    Sagar Pandya 7 years ago

    In the human heart, contraction is initiated by a special modified heart muscle known as sinoatrial node. Since the heart beat is initiated by the SA node and the impulse of contraction originates in the heart itself, the human heart is termed myogenic. The hearts of vertebrates and molluscs are also myogenic....

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    Ekta Singh 7 years, 1 month ago

    Because SAN is present on the upper right corner of right atria which regulate our heart without any help of external stimulus

    0Thank You

    Priyal Bansal 7 years, 1 month ago

    Because the contractions and relaxation in our heart is controlled by muscles and myogenic means generated by muscles

    0Thank You

    Ritu Vasisht 7 years, 1 month ago

    Bcz SA node present in right atrium which controll contractions of our ?.???

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    • Posted by Sahil Rupal 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 2 answers

    Ayursh Sharma 7 years, 1 month ago

    I will provide best answer

    0Thank You

    Neha 7 years, 1 month ago

    Racemose = the main axis continuos grow and flower occur laterally - it is in acropetal manner Cymose= the main axis terminater into floral structure - it is in basipetal manner

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    • Posted by Abhishek Verma 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 2 answers

    Neetu Jaiman 7 years, 1 month ago

    The reason is that the person is showing consciousness but not self conscious ness

    2Thank You

    Priyal Bansal 7 years, 1 month ago

    Living person

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    • Posted by Ajmeri Khan 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Ritu Vasisht 7 years, 1 month ago

    Read all chapter ncert questions and book.??

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    • Posted by Ajmeri Khan 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Ajmeri Khan 7 years, 1 month ago

    Because when proteses release in active form they digest the muscular wall of alimentry canal

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    • Posted by ⪻Shⱥrᴍa⪼ ཌ???????ད 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Ritu Vasisht 7 years, 1 month ago

    Floret is a small part of flower which makes the eatable part.????

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    • Posted by Abhishek Kala 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 0 answers
    ANSWER

    • Posted by Sufiyan Ali 4 years, 10 months ago

    CBSE > Class 11 > Biology
    • 1 answers

    Sia ? 4 years, 10 months ago

    A ribozyme is a ribonucleic acid (RNA) enzyme that catalyzes a chemical reaction. The ribozyme catalyses specific reactions in a similar way to that of protein enzymes. Also called catalytic RNA, ribozymes are found in the ribosome where they join amino acids together to form protein chains.

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    • Posted by Abhinav Sharma 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 3 answers

    Abhinav Sharma 7 years ago

    Right answer is 0

    0Thank You

    Sagar Pandya 7 years, 1 month ago

    The DPD in guttation will have negative

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    Sagar Pandya 7 years, 1 month ago

    DPD is diffusion pressure deficit which is equal to difference of OP-WP or OP-TP , DPD=OP-WP or OP-TP Where , OP= Osmotic Pressure, WP= Wall Pressure, TP= Turgor Pressure. DPD can be defined as the amount by which diffusion pressure of a solution is less than its pure solvent. & In case of DPD the water will move from low DPD to high DPD

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    • Posted by Nandini Bisht 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Abhinav Sharma 7 years, 1 month ago

    Water ka cell se bahar nikalna jisse cell shrink ho jae use pladmolydis khte h

    2Thank You

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    • Posted by Sahiba Khan 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 0 answers
    ANSWER

    • Posted by Umakant Chauhan 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Virendra Agrawal 7 years, 1 month ago

    Animal cell do no have cell wall

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    • Posted by Niharika Pasi 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Niharika Pasi 7 years, 1 month ago

    Red data book mean all animal and plant servive them

    2Thank You

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    • Posted by Amol Gùpta 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Ayursh Sharma 7 years, 1 month ago

    Not possible to do it here

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    • Posted by Apoorva Mishra 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 0 answers
    ANSWER

    • Posted by Neha 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 2 answers

    Priyal Bansal 7 years, 1 month ago

    Because gymnosperms have naked seeds but seeds are enclosed within fruits in angiosperms

    1Thank You

    Sudipta Kumari 7 years, 1 month ago

    Because of some differences like presence of ovules in angiosperms and it is absent in gymnosperm

    1Thank You

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    • Posted by Neha 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 2 answers

    Sudipta Kumari 7 years, 1 month ago

    Aldosterone Act mainly at the renal tubule. Reabsorption of Na+

    1Thank You

    Soumya Madeshia 7 years, 1 month ago

    Aldosterone, the main mineralocorticoid, is necessary for regulation of salt and water in the body.

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    • Posted by Aradhya Gupta 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Meghna Thapar 5 years, 9 months ago

    Mesoderm is a primary gum layer of the embryo lying between the other two gum layers namely ectoderm and endoderm. From it arises all connective tissues. From this definition The part that is of mesodermal origin is teeth. The mesoderm gives rise to the skeletal muscles, smooth muscle, blood vessels, bone, cartilage, joints, connective tissue, endocrine glands, kidney cortex, heart muscle, urogenital organ, uterus, fallopian tube, testicles and blood cells from the spinal cord and lymphatic tissue 

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    • Posted by Aditya Singh 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Priyal Bansal 7 years, 1 month ago

    A type of modification of stem e.g are eichornia ,pistia

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    • Posted by Krish Vashisht 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Samya Parmar 7 years, 1 month ago

    It is biological catalyst speed up the metabolic reactions It always has suffix -----ase

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    • Posted by Sushmita Bharti 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Samya Parmar 7 years, 1 month ago

    Double helix structure

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    • Posted by Iqra Nadeem 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Meghna Thapar 5 years, 9 months ago

    Duodenum receives the secretions of two glands, liver and pancreas through a common duct. Liver secretes bile which is alkaline and contains salts to emulsify the fats (or lipids). The bile secreted by the liver is stored in the gall bladder. Pancreas secretes pancreatic juice which contains trypsin, lipase and pancreatic amylase. Trypsin digests the proteins, lipase emulsifies the fats and pancreatic amylase breaks down the starch. Thus, small intestine is the site of complete digestion of carbohydrates, proteins and fats. The walls of ileum secrete succus entericus which completes the digestion process.

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    • Posted by Mansi Khenwar 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    The thyroid gland is a ductless endocrine gland situated in the anterior/front portion of the neck. It roughly resembles the shape of a butterfly. It is also one of the largest endocrine glands, weighing an average of 25 – 30 g. This gland has two lobes on either side of the trachea, with each lobe measuring 4 – 6 cm in length and 1.3 – 1.8 cm in width.

    2Thank You

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    • Posted by Sunaina Verma 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 3 answers

    Priyal Bansal 7 years, 1 month ago

    Eubacteria ,archaebacteria,blue green algae,mycoplasma

    0Thank You

    Aditya Singh 7 years, 1 month ago

    *Eubacteria

    0Thank You

    Aditya Singh 7 years, 1 month ago

    It is decided into two groups. -Archaebacteria -Ehbacteria

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    • Posted by Kartik Chhimpa 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Samya Parmar 7 years, 1 month ago

    It is decomposd by parasites

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    • Posted by Little .... 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Antigen Antibody
    Generally proteins but can be lipids, carbohydrates or nucleic acids. Antibodies are proteins.
    Triggers the formation of antibodies. Variable sites has the antigen binding domain.
    There are three basic kinds of antigens. (Exogenous, Endogenous and Autoantigens) There are five basic kinds of antibodies. (Immunoglobulins M, G, E, D and A)
    The region of the antigen that interacts with the antibodies is called epitopes. The variable region of the antibody that specially binds to an epitope is called paratope.
    Cause disease or allergic reactions. Protects the body by immobilization or lysis of antigenic material.

    2Thank You

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    • Posted by Sheikh Hisba 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 0 answers
    ANSWER

    • Posted by Abhishek Kala 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Insulin is a peptide hormone, which plays a major role in the regulation of glucose homeostasis. Insulin acts mainly on hepatocytes and adipocytes (cells of adipose tissue), and enhances cellular glucose uptake and utilisation. As a result, there is a rapid movement of glucose from blood to hepatocytes and adipocytes resulting in decreased blood glucose levels (hypoglycemia). Insulin also stimulates conversion of glucose to glycogen (glycogenesis) in the target cells.

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    • Posted by Abhishek Kala 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Tripti Shah 7 years, 1 month ago

    It is pneumatophorus. In the marine and aquatic areas the trees and plants are present have diffrent typ of respiration becouse the soil of marine area are full of water or after the first layer of soil their is only water so plant can not do gasses exchange or respiration . That is why they start to modify their roots and come out from the soil in the form of big spines to do the process of respiration . And the spines like structure of roots which are out of the soil is called pneumatophorus???

    2Thank You

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    • Posted by Abhishek Kala 7 years, 1 month ago

    CBSE > Class 11 > Biology
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Fluid mosaic model:

    1. Fluid mosaic model was proposed by Singer and Nicholson.
    2. According to this model, there is a central bilipid
      layer of phospholipids with their polar head group towards the outside and the non-polar tails pointing inwards. ,
    3. Some proteins which are embedded in the lipid layer are called integral or intrinsic proteins and they cannot be separated from the membrane.
    4. There are large globular integral proteins which project beyond the lipid layer on both the sides are believed to have channels through which water- soluble materials can pass across.
    5. Superficially attached proteins are called extrinsic or peripheral proteins and can be easily removed.
    6. Some membrane lipids and integral proteins remains bound to oligosaccharides which project into the extracellular fluid and influence the manner in which cells interact with one another.
    7. There are certain specific proteins called membrane receptors, which mediate the flow of materials and information into the cell.

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