Tag: botany

The flowers of Bougainvillea appear bright pink due to their bracts. This is called homochlamydeous condition when the calyx and corolla cannot be differentiated. These coloured bracts are called petaloid bracts.

A flower is characterised by the calyx and corolla as the non-essential whorls because these are not directly involved in the formation of gametes and fertilization. When these are absent, the flower is called achlamydeous. For example, flowers of willow.

An intersexual flower is also called as the perfect, bisexual or hermaphrodite flower. It has presence of both the male reproductive whorl called the androecium and the female reproductive whorl called the gynoecium. The units of androecium are called the stamens. The units of gynoecium are called the carpels. These are called essential whorls as they form the male gametes and female gametes. Hence, the correct answer is 'Both the essential floral whorls'

Trimerous flowers have flower parts, such as petals, sepals, and stamens, in sets of three. Pentamerous divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members. A dicot is a type of flowering plant characterized by its two cotyledons, tetramerous or pentamerous flowers, and net-like leaf veins.  In monocots, flowers are trimerous (number of flower parts in a whorl in threes).

In plants like Beta vulgaris, the gynodioecious condition is seen in which some plants have bisexual or hermaphroditic or perfect flowers. These flowers have both the male sex organs (androecium) and female sex organs (gynoecium). Then there are some plants that have only the pistillate or female flowers. A population of plants belonging to a species in which there is a co-existence of bisexual and pistillate flowers is called gynodioecious.

A trioecious condition is defined as the presence of the male flowers (staminate flowers), the female flowers (pistillate flowers) and the hermaphroditic flowers in three different plants. For example, Mango.

Three concentric regions of primary meristematic tissues develop immediately behind the apical meristem . These primary meristems produce the different tissues of the plant body: the outermost protoderm differentiates into the epidermis, a tissue that protects the plant; the adjacent ground meristem differentiates into the central ground tissues (the pith and cortex); and the procambium differentiates into the vascular tissues (the xylem, phloem, and vascular cambium).

Dicot roots have xylem in the center of the root and phloem outside the xylem. Phloem is surrounded by the pericycle followed by endodermis. Pericycle is made up parenchyma cells and sclerenchyma cells.
The cortex is the outer most layer of the dicot root. Cortex is made up of epithelium cells. Pith is absent in it. Hence, total 5 types of tissues are present within dicot root.

Parenchyma, collenchyma, and sclerenchyma are called simple tissues. And they are made up of similar kinds of cells. Vascular tissues are complex tissue as it is heterogeneous in nature with different types of cells. The main elements are the xylem, phloem and pericyclic.

Thus, the correct option is B.

Parenchyma form basic packing tissue but unspecialized function so many times in some plant it stores food.