Biology Test 294

Tap roots of certain plants like carrot and turnip are modified for the storage of food. These roots become swollen and store nutrients, which the plant can use during periods of scarcity.

Petunia is bicarpellary as it belong to solanaceae.

Leaves of dicotyledonous plants generally possess reticulate venation, where the veinlets form a network. This type of venation is characterized by a complex network of veins that branch and rebranch, forming a net-like pattern on the leaf surface.

Papilionaceous corolla has five free petals which resemble the butterfly. The posterior superior petal is larger than the others, two anterior inferior petals are more or less united forming a boat-shaped structure and are called carina or keel, two lateral petals called wings are present.

Meristematic tissue consists of immature cells that are in a constant state of division, contributing to the growth of plants. This tissue is found in specialized regions such as the tips of roots and shoots, where growth is most active. Unlike other tissues that might specialize in support, transport, or photosynthesis, the primary role of meristematic tissue is to facilitate growth through cell division.

In non- endospermic seeds like orchid, pea, lupin, the endosperm is completely consumed by the embryo.

Lateral meristems, such as the vascular cambium and cork cambium, are responsible for the secondary growth of plants. This type of growth increases the thickness of the plant, contributing to the development of a woody structure in trees and shrubs. Secondary growth is characteristic of many dicotyledons and gymnosperms but is absent in most monocotyledons.

In Solanaceae, the gynoecium is bicarpellary and the seeds are endospermic. Flowers of Solanaceae family are called as hypogynous flower as the sepals, petals, stamens are successively and freely inserted below the ovary and ovary is termed as superior. 

The promeristem, also known as the primordial or embryonic meristem, is the earliest form of meristem that develops in a plant. It is responsible for the formation of the embryo and the initial stages of the plant body. This foundational tissue sets the stage for further development into more specialized meristems that contribute to the plant's growth.

Parenchyma cells are versatile and can perform various functions, including photosynthesis, storage, and secretion. However, they are not typically involved in active cell division; this role is reserved for meristematic tissues. Parenchyma cells are known for their ability to adapt and take on multiple functions within the plant, contributing to the plant's overall health and growth.