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$ Obelia has three types of zooids namel...

$ Obelia has three types of zooids namely (i) polyps (ii) Balastostyles (iii) Medusae
! The occurrence of more than one forms in an individual is called polymorphisms.

A

If both As and R are correct and R is correct explanation of As

B

If both As and R are correct but R is not correct explanation of As

C

If As is correct, R is wrong

D

If both As and R are wrong.

Text Solution

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The correct Answer is:
A
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DINESH PUBLICATION-ENVIRONMENTAL ISSUES-Assertion and reason
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  2. $ The skeleton which occurs on the surface of animal body is called ex...

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  3. $ Obelia has three types of zooids namely (i) polyps (ii) Balastostyle...

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  4. $ Sea Aneomone has parasitic nutrition. ! Roundworms are also called...

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  5. $ Octopus is also called "Devil Fish". ! Animals of class crustacea ...

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  6. $ Male anopheles acts as the carrier host for malarial parasite ! Sl...

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  7. $ Scorpion has a sting in its tail ! Tube feet are present in starfi...

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  8. $ Electric ray fish is also called Torpedo ! Dinosaurs are also call...

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  9. $ Duck billed platypus is viviparous ! Duck is a type of platypus.

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  10. $ If natulity is greater than mortality, it leads to population explos...

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  11. $ Biosphere is a closed system ! Closed vascular bundles are having...

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  12. $ Phagotrophs take solid nutrition. ! Photosynthetic organisms are c...

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  13. $ Pyramid of Energy is always upright ! Pyramid of biomass is always...

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  14. $ Green plants have two types of nutrition. (i) Organic nutrition (ii)...

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  15. $ Air pollutants are always gaseous. ! Ultraviolet rays do not cause...

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  16. $ Stilt roots grow obliquely into soil. ! Respiratory roots are nega...

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  17. $ Those lateral buds which are near the apical bud are called dormant ...

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  18. $ Weak stems which can climb a support without any climbing organs are...

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  19. $ The method of arrangements of leaves on a stem is calle Aestivation ...

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  20. $ Phylloclade is a stem modification. ! There are present flowers on...

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