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A barrel shaped structure organised at i...

A barrel shaped structure organised at interzonal region by remaining spindle fibers at the end of telophase is

A

Tonoplast

B

Phragmoplast

C

Mitoplast

D

Tyloses

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The correct Answer is:
B
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Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. Silicon that has been doped with group - 15 elements is called

Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. Silicon that has been doped with group - 13 elements is called

Read the following passage and answer the questions at the end of it. Conductivity of silicon increases if it is doped with certain other elements. Doping means introduction of small amount of impurities like phosphorus, arsenic or boron in the pure crystal. In pure silicon four valencies are used in bonding with other four adjacent silicon atoms. When a silicon crystal is doped with a group - 15 element (with five valence electrons) such as P, AsSb or Bi, the structure of the crystal lattice remains unchanged. Out of the five valence electrons of group - 15 doped element, four electrons are used in normal covalent bonding with silicon and fifth electron is delocalised and thus conducts electricity Doping a silicon crystal with a group-13 element (with three valence electron) such as B, Al, Ga or In produces a semiconductor with three electrons in dopant. The place where fourth electron is missing is called as electron vacancy or hole. If NaCl is doped with 10^(-3)" mol % " SrCl_(2) then concentration of cation vacancies is

AAKASH SERIES-CELL CYCLE AND CELL DIVISION-Exercise-II
  1. If each cell of the spore tetrad has 7 chromosomes, how many chromosom...

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  2. In mitosis the pressure on centromere will be more during

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  3. A barrel shaped structure organised at interzonal region by remaining ...

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  4. Condensation and decondensation of chromosomes occurs respectively in

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  5. Precursor of cell plate is

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  6. Identify the correct statements

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  7. Which one is not possible due to mitosis?

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  8. When compared to G(1) phase of mitosis quantity of DNA in nucleus of e...

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  9. When 16 cells are formed from a single cell, how many times cells divi...

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  10. Number of meiotic cycles, occuring in a meiocyte

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  11. Meiosis in plant occurs, when there is a change from

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  12. Meiosis is characterised by

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  13. Process which is antithetical to fertilization is

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  14. The subphase of prophase-I showing enlargement of nucleus and nucleolu...

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  15. If each cell of the spore tetrad contains 4 chromosomes, how many pach...

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  16. Regions of crossing over are indicated cytologically by

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  17. Enzymes help in crossing over

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  18. What is the ratio of the number of chromatids, chromosomes, bivalents ...

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  19. Chromosomes of the bivalent are fused (Joined) by their chiasmata near...

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  20. Movement of bivalents towards the periphery of the nucleus and their m...

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