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A dithecous anther consists of ul((i)) m...

A dithecous anther consists of `ul((i))` microsporangia, `ul((ii))` in each lobe.

A

`{:((i),(ii).),(four,two):}`

B

`{:((i),(ii).),(two,"one"):}`

C

`{:((i),(ii).),(two,two):}`

D

`{:((i),(ii).),(four,"one"):}`

Text Solution

Verified by Experts

The correct Answer is:
A
A stamen or male reproductive organ of a flower is made up of two parts-a stalk-like filament and a knob like terminal anther. Each anther has two lobes which are attached at the back by a sterile band called connective. When both the anther lobes are present, the stamen is called bithecous (or dithecous). A dithecous anther is tetrasporangiate having four microsporangia. Each lobe has two microsporangia separated by a strip of sterile tissue. When a single anther lobe is present, the stamen is termed as monothecous.
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Knowledge Check

  • Read the following statements and find out the incoorect statement. a. the number and length of stamens is variable in flowers of same species. b. A typical angiosperm anther is bilobed with each lobe having two theca. c. Often a longitudinal groove runs lengthwise separating the theca. d. The anther consists of four microsporangia located at the corners one in each lobe. e. the microsporangia develop further and become pollen sacs. They extend longitudinally all through the length of an anther and are packed with pollen grains.

    A
    b, c and e
    B
    a, c and d
    C
    a and d only
    D
    a and b only

  • How many microsporangia are found in each lobe of anther ?

    A
    One microporangia
    B
    Two microporangia
    C
    Three microporangia
    D
    Four microporangia

  • Electrolysis of an aqueous solution of AgNO_(3) with silver electrodes produces ul((i)) at cathode while ul((ii)) ions are dissolved from anode. When Pt electrodes are used ul((iii)) is produced at anode and ul((iv)) at cathode.

    A
    `{:("(i)", "(ii)","(iii)","(iv)"),(H_(2), NO_(3)^(-) , OH^(-) , H_(2)):}`
    B
    `{:("(i)", "(ii)","(iii)","(iv)"),(Ag, H^(+) , O_(2) , H_(2)):}`
    C
    `{:("(i)", "(ii)","(iii)","(iv)"),("Ag", "Ag"^(+) , O_(2) , Ag):}`
    D
    `{:("(i)", "(ii)","(iii)","(iv)"),(Ag, H^(+), "Ag"^(+), O_(2)):}`

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