In china rose the flowers are:

  • Option 1)

    Zygomorphic, epigynous with twisted aestivation

  • Option 2)

    Actinomorphic, hypogynous with twisted aestivation

  • Option 3)

    Actinomorphic, epigynous with valvate aestivation

  • Option 4)

    Zygomorphic, hypogynous with imbricate aestivation

 

Answers (1)
V Vakul

As discussed in

Actinomorphic flower -

When a flower can be divided into two equal halves by many vertical sections passing through the center called actinomorphic or radial

- wherein

eg: cruciferae, malvaceae

 

And,

 

Types of Aestivation -

(1) Valvate - when sepals or petals lie very close to each other without over lapping eg: mustard , calotropis

(2)  Twisted Aestivation - when one margin of petal or sepal overlaps the margin of next eg: China rose

(3) Imbricate - When both margins of one of the petals are covered by others & both margins of another one are external eg: Caesalpiniaceae

(4) Quincuncial - when two are inner & two are outer, and one is partly outer & partly inner eg: Ranunculus

(5) vexillary - posterior petal is largest & covers two lateral petal the latter in turn nearby overlap the anterior petal eg: pea

 

 

-

 

 And,

 

Position of floral parts on thalamus -

Hypogyny - ovary is at the top and separable from thalamus. ovary is superior and convex

eg: Brassica & malva

perigyny: ovary is half superior and half inferior. example, rose.

Epigyny - calyx & corolla arise from the upperside of ovary & Ovary is completely surrounded by or fused by thalamus. Ovary is inferior. eg: luffa , Aster

-

 

 

 

 


Option 1)

Zygomorphic, epigynous with twisted aestivation

This option is incorrect.
 

Option 2)

Actinomorphic, hypogynous with twisted aestivation

This option is correct.
 

Option 3)

Actinomorphic, epigynous with valvate aestivation

This option is incorrect.
 

Option 4)

Zygomorphic, hypogynous with imbricate aestivation

This option is incorrect.
 

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