Why are the following described as stated :
(a) The androecium of pea flower is diadelphous
(b) Ray florets of sunflower as neuters
(c) Salvia sepals as petaloid
Answers
Explanation:
The androecium of pea flower is diadelphous because the filaments of anther are united in two bundles. In case of pea, out of ten, nine stamens form a staminal tube while one is free. (b) Ray florets of sunflower are neuters because both male and female reproductive organs are lacking or absent
Incomplete flower
If one or more sets of floral structures are missing, the flower is called incomplete flower.
E.g. American elm.
b) Staminate flower
A unisexual flower which contains only the stamens, i.e., male parts of a flower is called
male or staminate flower.
E.g. Eastern cottonwood.
(c) Pistillate flower
A flower which contains only the carpels, i.e., female parts of a flower is called female or
pistillate flower.
E.g. Date palm.
(d) Bisexual flower
A flower which contains both stamens and carpels is called bisexual or hermaphrodite flower.
E.g. Hibiscus.
(e) Inflorescence
Inflorescence is the mode of arrangement of flowers on the axis of the plant.
(f) Placenta
Tissue that attaches the ovule to the wall of the ovary is called placenta.
(e) Placentation
Placentation is the manner in which the ovules are arranged/attached to the wall of the ovary.
2. Distinguish between the following pairs
(a) Flower and inflorescence
Flower is a specialized shoot in which the leaves are modified into floral structures.
Inflorescence is the mode of arrangement of flowers on the axis of the plant.
(b) Petals and Petaloid
Petals are non-essential parts of a flower which help in protection of reproductive parts and
make the flower attractive for pollination.
Undifferentiated petals and sepals together form the perianth. When perianth is non-green, it
is called a petaloid.
(c) Petaloid and Sepaloid
When perianth is non-green, it is called a petaloid.
When perianth is green like the sepals, it is a sepaloid.
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