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A: Each cell fo the sporogenous tissue i...

A: Each cell fo the sporogenous tissue is capable of giving rise to a microsproe tetrads
R: Most abundant microspore tetrads is the product of simultaneous cytokinesis

A

if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark

B

if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark

C

if assertion is true statement but reason is false then mark

D

if both assertion and reason are flase statements then mark

Text Solution

Verified by Experts

The correct Answer is:
B
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If a typical angiospermic anther has 25 microspore mother cells in its each sporangium, calculate the total number of microspore tetrads, pollen grains and male gametes respectively produced by this anther.

On the basis of your understanding of the following paragraph and the related studied concepts. An electric dipole is a pair of equal and opposite point charges q and -9 separated by a distance '2a'. The total charge of the electric dipole is obviously zero but the field of the electric dipole at a point is non-zero because electric fields due to + qand - q charges at the point do not exactly cancel out. Electric field of a dipole, at large distances, depends on the product 'qa'. So we define a term dipole moment vector vecp of an electric dipole as vecp = q(2a) and its direction is along the line from q to + q charge. The dipole field at large distances fall off as 1/r^3 . Further, the magnitude and direction of the dipole field depends not only on the distance r but also on the angle between the position vector vecr and the dipole moment vecp . Concept of electric dipoles is very significant for different materials. In most molecules, the centres of positive charges and of negative charges exactly coincide and their dipole moment is zero. However they develop a dipole moment when an electric field as applied. Such molecules are termed non-polar molecules. But in some molecules, the centres of positive charges do not exactly coincide with that of negative charges and the molecules has a permanent dipole moment even in the absence of an electric field. Such molecules are called polar molecules. Various materials give rise to interesting properties and important applications in the presence or absence of electric field. Is the electric field due to a charge configuration with total charge zero necessarily zero ? Give an illustration in support of your answer.

Knowledge Check

  • As each cell of the sporogenous tissue is capable of giving rise to .....

    A
    a megaspore diad
    B
    a megaspore tetrad
    C
    a microspore diad
    D
    a microspore tetrad

  • The cells of sporogenous tissue undergo____ division to form microspore tetrads.

    A
    Mitotic
    B
    Meiotic
    C
    Amitoitc
    D
    Cleavage

  • Which of the following statement is applicable for all flowering plants ? 1 Each cell of sporogenous tissue in anther is capable of giving rise to microspore tetrad II The polllen grain reprsent male gametophyte III Pollen grains are usually traingular and 10-15 mu m in diameter IVsporopollenin is one of the most resistance organice material whihc can be destoryed only by storn acids and alkali

    A
    monosiphonous pollen tube
    B
    non motile and morphologically dissimilar gamestes
    C
    presence of pollinium
    D
    division of generatve cell after pollination

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    On the basis of your understanding of the following paragraph and the related studied concepts. An electric dipole is a pair of equal and opposite point charges q and -9 separated by a distance '2a'. The total charge of the electric dipole is obviously zero but the field of the electric dipole at a point is non-zero because electric fields due to + qand - q charges at the point do not exactly cancel out. Electric field of a dipole, at large distances, depends on the product 'qa'. So we define a term dipole moment vector vecp of an electric dipole as vecp = q(2a) and its direction is along the line from q to + q charge. The dipole field at large distances fall off as 1/r^3 . Further, the magnitude and direction of the dipole field depends not only on the distance r but also on the angle between the position vector vecr and the dipole moment vecp . Concept of electric dipoles is very significant for different materials. In most molecules, the centres of positive charges and of negative charges exactly coincide and their dipole moment is zero. However they develop a dipole moment when an electric field as applied. Such molecules are termed non-polar molecules. But in some molecules, the centres of positive charges do not exactly coincide with that of negative charges and the molecules has a permanent dipole moment even in the absence of an electric field. Such molecules are called polar molecules. Various materials give rise to interesting properties and important applications in the presence or absence of electric field. In which direction is the magnitude of electric field due to a short dipole (i) maximum, (ii) minimum ? Write expression for the same.

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