X CBSE Science

X CBSE Science includes:-

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REVISION 2020 – 21 SCHEDULE

X CB Revision Plan 2020-21

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211 thoughts on “X CBSE Science”

      1. Sir, 2.42=3*10rise to8/speed in diamond
        Speed in diamond=3*10rise to 8/2.42
        =3*100/2.42*100
        =(300/242)*10rise to8
        =1.23*10rise to8 is the ans i got sir

    4. Sir, 2.42=3*10rise to8/speed in diamond
      Speed in diamond=3*10rise to 8/2.42
      =3*100/2.42*100
      =(300/242)*10rise to8
      =1.23*10rise to8 is the ans i got sir

      1. Sir,
        1. Chlorophyll contains magnesium ion
        2. Examples of animals with different chambered heart
        2 Chambered heart — Fishes
        3 Chambered heart– All amphibians and reptiles except crocodiles . Crocodiles have 4 chambered heart .
        4 Chambered heart– Birds and mammals

      1. Sir, 2.42=3*10rise to8/speed in diamond
        Speed in diamond=3*10rise to 8/2.42
        =3*100/2.42*100
        =(300/242)*10rise to8
        =1.23*10rise to8 is the ans i got sir

    2. Sir, In double displacement reaction if the product side is written vice versa then will the answer be correct.
      Can you explain that with the help of the raction given in page-11,last reaction.

      2. In the case of double displacement reaction if the reaction is reversed products become reactants and vice versa. But the reaction does not proceed, unless it is a reversible reaction.
        In the case of reversible reactions that is forward and backwad reactions are possible, this will happen. In other cases not possible.
        Our example of reaction between BaCl2 and Na2SO4 is an irreversible reaction.

    1. Silver Gold and Platinum are precious metals as they resist corrosion. Eventhough silver becomes dark due to the formation of silver sulfide layer (Ag2S). That is why silver ornaments become dark.
      Aluminium isself resistant to corrosion due to formation of a thin layer of Aluminium Oxide (Al2O3)

  12. sir I’ve heard of saprophytic,parasitic and symbiotic but all these are types of heterotrophic nutrition. I think there are only 2 types- autotrophic and heterotrophic nutrition

  14. Parasitic nutrition – organisms that obtain nutrition from host by living inside the host body
    Saprophytic nutrition- organisms break down the food outside the body and absorb the nutrients
    Holozoic nutrition – organisms take in food and break it inside the body

    1. Animal parasites include leeches , lice , fleas , tapeworm etc
      While plant parasites include Viscum album , stinking corpse lily etc…

    1. Chlorophyll contains magnesium metal

      Two chambered heart – Pisces
      Three chambered heart – Amphibia, and reptiles.
      Crocodile is a reptile and have four chambered heart

    1. Phloem contains :-
      Companion cells
      Seive tubes
      Phloem parenchyma
      Phloem fibers

      Xylem contains :-
      Tracheids
      Vessels
      Xylem parenchyma
      Xylem fibers

  30. animal with two chambered heart- shark
    animal with three chambered heart- reptile
    crocodile has four chambered heart
    magnesium is the metal contained in chlorophyll
    Navya Binoy

  34. Magnesium is present in chlorophyll pigment

    Fishes have two chambered hearts

    All Amphibians eg- frogs. and all reptiles except crocodile have 3 chambered hearts

    Crocodiles have 4 chambered hearts

  37. Sir,

    Metal pigment which is found in chlorophyll is magnesium
    2 chambered heart – Fishes
    3 chambered heart – Amphibians
    4 chambered heart – Birds and Mammals
    Reptiles have three and a half chambered heart but crocodile have 4 chambered heart

  39. The metal present in chlorophyll is magnesium…
    Fishes have two chambered heart…
    Reptiles have three chambered heart…
    Mammals and birds have four chambered heart…
    While the crocodile being a reptile has a four chambered heart…

  40. metal present in chlorophyll is magnesium (mg)
    fish have two chambered heart
    amphibians have three chambered heart
    crocodile has 4 chambered heart

  44. The metal associated with chlorophyll is magnesium.
    2 chambered heart -fish.
    3 chambered heart -amphibian and reptiles.
    Crocodiles have 4 chambers in heart.

  45. 2 Chambered animal— Pisces
    3 Chambered animal— Amphibia and Reptilia eg: toad , salamander , turtle , chameleon etc.
    4 Chambered animal— Aves and Mammalia eg: pigeon , crow , human , cat etc.
    In reptilia crocodiles have an exception because they have 4 heart chambers

  46. TODAY’S HOMEWORK
    Metal present in chlorophyll is magnesium
    2 chambered heart in fishes also called gill circulation
    3 chambered heart in amphibians and reptiles
    crocodile has 4 chambered heart with two ventrical and both left and right aorta which are connected to a hole .
    Like mammals it has heart valves

  49. 1)Chlorophyll contains a metal called magnesium.

    2)2 chambered heart : Pisces
    3 chambered heart : Ambhibia And Reptiles
    Crocodile is also considered in the reptile group but it contains 4 chambered heart

  50. Fishes have a two-chambered heart
    Reptiles and amphibians have a three-chambered heart but crocodile has a four-chambered heart
    Mammals and birds have a four-chambered heart

  51. The metal associated with chlorophyll is- Magnesium
    2 chambered heart animals- Fishes
    3 chambered heart animals- Reptiles
    Crocodiles have 4 chambered heart

    1. Components of xylem:Trachieds, Vessels, Xylem parenchyma, Xylem fibres
      Components of Pholem:Phloem fibres, Phloem parenchyma, Sieve tubes, Sieve plates, Companion cell

      Micturition:The process of urination

  53. The metal which is associated with chlorophyll is magnesium
    fish has 2 chambered heart
    salamander has 3 chambered heart
    crocodiles have 4 chambered heart

  54. metal associated with chlorophyll is Magnesium(Mg)
    2 chambered heart- fish
    3 chambered heart- all reptiles except crocodile which is having 4 chambered heart.

  56. Components of phloem — Sieve tubes ,Companion cells ,Phloem parenchyma ,Phloem fibres
    Components of xylem — Vessels , Tracheids , Xylem parenchyma ,Xylem fibres

  58. Components of Xylem
    Tracheids, vessels, xylem parenchyma, xylem fibres

    Components of Phloem
    Sieve Tubes, Companion Cells, Phloem Fibres and Phloem Parenchyma

    Micturition
    The process of urine excretion from urinary bladder…

  60. Components of xylem-Tracheids,Vessels,xylem parenchyma,xylem fibres.
    Component’s of Phloem – Sieve tubes,Companion cells, Phloem fibres , phloem parenchyma cell.

  61. Parts of phloem- sieve tubes, companion cells, phloem- fibres, phloem- paranchyma

    Xylem parts- tracheids, vessels, xylem paranchyma, xylem fibres

    Micturition meaning – urination

  62. Components of xylem-Tracheids,Vessels,xylem parenchyma,xylem fibres.
    Component’s of Phloem – Sieve tubes,Companion cells, Phloem fibres , phloem parenchyma.

  64. xylem components are:- tracheids, vessels, xylem parenchyma,xylem fibers
    phloem components:- companion cells, sieve tubes, phloem fibers phloem parenchyma
    micturition is the process of expelling urine from the urinary bladder

  65. Sir
    The different components of xylem are tracheids, vessels xylem paranchyma, xylem fiber
    The different components of phloem are sieve tube,companion cells, phloem paranchyma, phloem fibers
    The passing of urine is called micturition

  66. Components of xylem: Trachids ,vessels , xylem parenchyma , xylem fibres
    Components of phloem: Sieve cells , sieve tubes , companion cells , phloem parenchyma

    Micturition: Action of urinating

  67. components of xylem are tracheids, vessels, xylem parenchyma, xylem fibres
    components of phloem are sieve tubes , companion cells, xylem parenchyma , xylem fibres
    MICTURITION
    After kidneys have done their job now it is the bladder’s job to store the urine and empty fully at the time of urination which is also known as micturition

  69. Xylem components–>xylem parenchyma, xylem fibres, vessels and tracheids.
    Phloem components–>phloem parenchyma, phloem fibres, sieve tubes and component cells.
    MICTURITION is an action of urinating.

  70. Components of xylem – xylem tissue , tracheids , vessels,xylem parenchyma ,xylem fibres.

    Components of phloem – sieve tubes , companion cells , phloem fibres , phloem parenchyma

    Micturition is the process of discharging urine from the urinary bladder .

  72. Xylem – xylem parenchyma,vessels,xylem fibres,tracheids
    Phloem-sieve tubes,companion cells,phloem parenchyma,phloem fibres
    mictrution- the action of urination

  73. Xylem is composed of 4 elements
    1. Xylem tracheids
    2. Xylem vessels
    3. Xylem parenchyma
    4. Xylem fibres

    Phloem is composed of
    1. Sieve tubes
    2. Companion cells
    3. Phloem parenchyma
    4. Phloem fibres

    Micturition:- It is the release of urine from urinary bladder through urethra

  74. 1)Different components of Xylem: Tracheids, Vessels, Xylem fibres,
    Xylem Parenchyma.
    Different components of Phloem:
    Sieve tubes, Companion cells, Phloem fibres, Sieve cells,Phloem parenchyma.
    2)Micturition: Removal of urine from the urinary bladder is called micturition.

  75. 1. Xylem components are tracheids, vessels, xylem fibres and xylem parenchyma
    2. Phloem components are sieve cells, sieve tubes, companion cells, phloem fibers and phloem parenchyma
    3. Micturition – expelling of urine from the urinary bladder

  76. Xylem components: xylem tracheids, xylem vessels, xylem parenchyma, xylem fibres.
    Phloem components: sieve tubes, companion cells, phloem parenchyma, phloem fibres.

    Micturition is the release of urine from urinary bladder through urethra.It is also called urination.

  77. The components of xylem are xylem tracheids, xylem vessels, xylem parenchyma, and xylem fibers
    The components of phloem are sieve tubes, companion cells phloem fibers, and phloem parenchyma

  79. Xylem componenets- Tracheids, xylem vessels, xylem parenchyma, mylem fibres and xylem sclerenchyma
    Phloem components- Companion cells, sieve tubes, phloem fibres and phloem parenchyma
    Micturition is the process of expelling urine from the urinary bladder

  105. If AB=BC=AC, the triangular phase of the prism forms an equilateral triangle. In an equilateral triangle all the angles are equal and each of it’s angle is 60 degree. Therefore, angle A= angle B = angle C = 60 degree.

  157. Sir, Megha of X CBSE here. Sir, why is necessary that functional groups must be directly attached to the carbon chain? What will happen if those atoms are attached indirectly ?

  160. metal associated with chlorophyll – magnesium
    2 chambered – fishes
    3 chambered – amphibians and reptiles
    crocodile – 4 chambered heart
    xylem components – tracheids , vessels , xylem parenchyma , xylem fibres
    phloem components – companion cells , sieve tubes , phloem parenchyma , phloem fibres
    Micturition – process of urine excretion from the urinary bladder .

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