Hibiscus is syncarpous gynoceium
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Answers
Explanation:
yes, hibiscus is syncarpous gynoecium if it's carpel are fused
Hope it helps!
Answer:
A typical angiosperm flower has following parts:
1. Bract (= Hypsophyll):
It is a leaf like structure in whose axil a flower often develops.
2. Pedicel:
It is the stalk of the flower which may be short, long or even absent.
3. Bracteoles:
They are scaly appendages present on pedicel.
4. Receptacle (= Thalamus or Torus):
It is the swollen or expanded tip of the pedicel which bears four whorls i.e. calyx, corolla, androecium and gynoecium. Of these, calyx and corolla are collectively called as helping or accessory whorls, while androecium and gynoecium are together known as essential or reproductive whorls.
5. Floral whorls:
(a) Calyx:
It is the first or outermost protective whorl. Individual member of calyx is called a sepal which is generally green.
(b) Corolla:
It is the second or attractive whorl present inner to calyx. Each member of corolla is called a petal.
(c) Androecium:
It is the third or male whorl. It is a collection of male parts called stamens. Each stamen is a modified leaf or microsporophyll. Each stamen consists of 3 parts – filament, anther and connective. Each anther has two anther lobes and each lobe usually contains two pollen sacs or micro-sporangia filled with pollen grains or microspores.
(d) Gynoecium or Pistil:
It is the fourth or female whorl, arid its functional units are called carpels (= megasporophylls). A typical carel consists of ovary, style and stigma. Ovary is the swollen basal part of the carpel that contains one or more ovules. Each ovule connected to the ovary wall through a special tissue called palacenta.
Bracts:
Bracts are specialized leaves from the axil of which bracteate flowers arise.
Bracts vary in size, colour and duration and are of following kinds:
(i) Foliaceous or Leafy bracts:
Green, flat and leaf like, e.g., Acalypbn, Adhatuda Gynandropsis.
(ii) Spathe:
Large, boat-shaped and tightly coloured bract enclosing lowers, e.g., banana, palms, Coloscassia.
(iii) Petaloid bracts:
Brightly coloured bracts like petals, e.g Polnsettia (Euphorbia pulcherrima)
(iv) Involucre:
Group of bracts in one or more whorls around luster of flowers, e.g., sunflower.
(v) Epicalyx:
Whorl of bracteoles arising at the base of tie calyx, e.g., cotton, lady’s finger, strawberry.
(vi) Glumes:
Small and dry scaly bracts found only in gasses and sedges.
(vii) Scaly bract:
Present at the base of each floret of members of compositae, e.g., sunflower.II. Polypetalous and Irregular:
(a) Papilionaceous:
Here corolla with five petals appears butterfly shaped. The posterior large petal is called standard or vexillum, two lateral petals are called wings or alae and two innermost fused petals are called keel or carina. It is the characteristic of family Papilionaceae.
III. Gamopetalous and Regular:
(a) Tubular – tube-like or cylindrical corolla, e.g., disc florets of sunflower.
(b) Campanulate-bell-shaped corolla, e.g., Campanula, Physalis.
(c) Infundibuliform-furmel-shapedcorolla, e.g.,Petunia, Datura
(d) Rotate – wheel-shaped corolla, e.g., Calotropis, brinjal.
(e) Hypocrateriform-Salver-shaped corolla, e.g., Vinca.
(f) Urceolate-Um-shapedcorolla, e.g.,Bryophyllum.
IV. Gamopetalous and Irregular:
(a) Ligulate-Strap-shaped corolla, e.g., ray florets.
(b) Bilabiate – two-lipped corolla where lips remain always open, e.g., Salvia, Ocimum etc.
(c) Personate – two-lipped corolla where lips remain closed by a projection called Palate e.g., Antirrhinum (snapdragon), Lindenbergia.
4. Aestivation of Corolla and Calyx:
Aestivation is the mode of arrangement of sepals or petals in relation to one another in a floral bud. It is useful in classification and identification of plants.
It is of following types:
(i) Valvate:
The edges of sepals or petals touch or most not ‘ouch each other but do not overlap, e.g., mustard, coriander etc.
(ii) Twisted (contorted):
One edge of petal or sepal regularly overlaps the margin of the next one, e.g., petals of china rose.
(iii) Imbricate:
The overlapping becomes irregular. Out of five members, one is outer, one is inner and the rest three remain in twisted condition.
It has two sub-types:
a. Ascending Imbricate:
Posterior petal is innermost i.e. being overlapped by the lateral petals, e.g., Cassia.
b. Descending Imbricate (= vaxillary):
The posterior petal is outermost and largest that overlaps the lateral petals (wings). They in turn enclose the two anterior smallest petals (keels). It is also called papilionaceous.