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[A] : Endomixis is Paramecium involves ...

[A] : Endomixis is Paramecium involves total internal nuclear reorganisation within a single individual .
[R] : It takes place in the absence of conjugation.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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[A] : The conjugation in Paramecium involves meiosis and fusion of pronuclei of two individuals . [R] : During conjugation , macronucleus gradually elongates and breaks up into fragments which are absorbed into the cytoplasm .

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Light guidance in an optical fibre can be understood by considering a structure comprising of thin solid glass cylinder of refractive index n_1 surrounded by a medium of lower refractive index n_2 . The light guidance in the structure takes place due to successive total internal reflectrions at the interface of the media n_1 and n_2 as shown in the fugure. All rays with the angle of incidence i less than a particular value i_m are confined in the medium of refractive index n_1 . The numerical aprture (NA) of the structure is defined as sini_m If two structure of same cross-sectional area, but different numerical apertures NA_1 and NA_2(NA_2ltNA_1) are joined longitudinally, the numerical aperture of the combined structure is

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A transparent cube of side d, made of a material of refractive index mu_(2) , is immersed in a liquid of refractive index mu_(1)(mu_(1)ltmu_(2)) . . A ray is incident on the face AV at an angle theta (shown in the figure). Total internal refraction takes place at point E on the face BC. Then must satisfy:

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TRUEMEN BIOLOGY ENGLISH-Animal Kingdom -ASSERTION AND REASON
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  2. [A] : Protozoans have no physiological division of labour . [R] : Th...

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  3. [A] : Endomixis is Paramecium involves total internal nuclear reorgan...

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  4. [A] : Sponges are primitive multicellular animals that probably evolve...

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  5. [A] : Annelids , Arthropods and mollusks are protostomial coelomates ....

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  6. [A] : The body cavity of earthworm is a true coelem . [R] : It is li...

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  7. [A] : Pearl is formed when a foreign particle gets in between shell an...

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  8. [A] : Fasciola is hermaphrodite . [R] : Gonads are well developed an...

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  9. [A] : There are 10 tidemanns bodies in ambulacral system of echinoderm...

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  10. [A] : Termites and ants are social insects . [R] : They make fungus ...

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  11. Assertion(A): In sponges, archaeocytes are totipotent. Reason( R): T...

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  12. [A] : The honey is a vital food for animals including man . [R] : Th...

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  13. [A] : Leeches secrete hirudin from their salivary glands . [R] : Hir...

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  14. [A] : All invertebrates can keep their body temperature constant all t...

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  15. [A] : In Taenia solium , bladder worm is also known as cysticercus . ...

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  16. [A] : Earthworm obtain oxygen for respiration through moist skin . The...

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  17. [A] : Presence of alimentary canal would not have suited the mode of l...

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  18. [A]: Development in cockroach is termed as retrogressive metamorphosis...

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  19. [A] : All the gills of Palaemon are phyllobranchs . [R] : Each gill ...

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  20. [A] : Renal-sac of Prawn functions in same manner as vertebrate kidney...

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