The entire process of mitotic CDKs activation and entry into mitosis involves two positive feedback loops and coordination between events at the centrosome, in the cytoplasm, and in the nucleus.

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The entire process of mitotic CDKs activation and entry into mitosis involves two positive feedback loops and coordination between events at the centrosome, in the cytoplasm, and in the nucleus.

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#XL - R Botany

The flower

Perfect flowers have both an androecium and a gynoecium

Imperfect flowers have one or the other and are termed pistillate if they contain female reproductive structures or staminate if only male reproductive structures

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Symmetry of flowers

actinomorphic (radial symmetry).

Example;  Mustard, datura, chilli.

(Brassicaceae, Solanaceae and Liliaceae family)

zygomorphic (bilateral symmetry).

Example;   pea, gulmohur, bean, Cassia.

(Fabaceae family)

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Flower is asymmetric (irregular)

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Parts of flowers

Sepals collectively form the calyx, 

The calyx may be gamosepalous  (sepals united) or polysepalous (sepals free)

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The next internal whorl is the corolla and is composed of petals. corolla may be also united gamopetalous (petals united) or polypetalous (petals free).

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Types of flowers

Hypogynous flower- The ovary in such flowers is said to be superior,  e.g., mustard, china rose and brinjal.

Perigynous flower- The ovary here is said to be half inferior. e.g., plum, rose, peach. (Rosaceae)

Epigynous flowers, the ovary is said to be inferior. e.g., guava and cucumber, and the ray florets of sunflower.