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Nuclear envelope disappears at...

Nuclear envelope disappears at

A

more permeable to `Na^(+)`

B

less permeable to `K^(+)`

C

more permeable to both `Na^(+)` and `K^(+)`

D

less permeable to both `Na^(+)` and `K^(+)`

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Nuclear envelope reappears at

Nuclear envelope reappears at

The following process occurs in metaphase : (a) centrioles move to opposite poles (b) chromosomes line up along the equator of the dividing cell (c) chromosomes move to opposite poles (d) nuclear envelope disappears

Nuclear envelope is a derivative of

Nuclear envelope is a derivative of

[A] : The nuclear membrane forms envelope like structure called nuclear envelope around nuclear contents . [R] : The nuclear envelopes separate the nuceloplasm from protoplasm .

Give the biological/technical terms for the following: The stage of cell division in which the nuclear membrane disappears and the chromosomes become short and thick.

Identify the mitotic stage from the given features . (i) Nuclear envelope degenerates completely . (ii) Chromosomes are spread throughout the cytoplasm . (iii) Fully formed spindle apparatus consists of fine fibres .

Read the statements below regarding the nucleus of a cell. Identify them as true or false and select the correct combination option. I. The nucleus displays an elaborate nucleoprotein fiber called chromatin during the interphase of the cell cycle. II. The space between the parallel membranes of the nuclear envelope is called the nucleoplasm. III. Nucleus was discovered first by Flemming. IV. The nuclear pores within the nuclear envelope are formed by the fusion of both membranes. {:("No.",I,II,III,IV),(1,"True","True","False","False"),(2,"True","False","False","False"),(3,"True","True","False","False"),(4,"True","False","False","True"):}

The nuclear membrane disappears in

ICSE-NEURAL CONTROL AND COORDINATION-(Review question) long answer
  1. Nuclear envelope disappears at

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  2. How does nerve impulse travel in axon ?

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  3. How does nerve impulse travel across axon ?

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  4. Give a well labelled diagram of the eye. Explain the phenomenon for th...

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  5. Explain a reflex arc along with a diagram

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  6. Give a well labelled diagram of spinal cord explaining its various par...

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  7. What is the mechanism of hearing ?

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  8. What are the effects of sympathetic and parasympthetic system on vario...

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  9. Explain the functions of various parts of the eye.

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  10. What is the primary function of the neuroglia cells ? What special str...

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  11. How does a wave of depolarisation spread along a nerve fibre ?

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  12. What is a synapse ? How does the nerve impulse cross the synapse ?

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  13. What is the action potential of a neuron ? Do all neurons possess the ...

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  14. Why is the mode of conduction of electrical impulse along the myelinat...

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  15. (a) Make a clearly labelled diagram of the inner ear of a human being....

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  16. Are rods and cones evenly distributed over the entire surface of the r...

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  17. Blind spot in the eye is devoid of the ability of vision. Why is it so...

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  18. If a strong odour is smelled continously for sometime the sensation of...

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  19. Which parts of the nervous system participate in the maintenance of ba...

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  20. What is a reflex ? What units of the nervous systems are involved with...

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  21. Which nerve tract connects the right and left hemispheres of the cereb...

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