Coriander and sagittaria show the phenomenon of heterophylly. This refers to different leaf forms on the same plant.

Meristamatic tissue is responsible for growth in plants.

Most of the hydrophytes lack true roots due to the availability of plenty of water.

Ecology is the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.

Centrioles are present in the cells of most eukaryotes, e.g. those of animals. However, they are absent from conifers (pinophyta) and flowering plants (angiosperms). 

Apical zone consists of meristamatic tissue.

In a plant with a taproot system, the primary taproot is the largest, most central and most dominant root. 

Unicellular hair on root occur in the root hair zone.

Some foliar buds can produce foliar roots, e.g. Bryophyllum, Begonia and Pogostemon.

The root cap is absent in some parasitic plants and some aquatic plants, in which a sac-like structure called the root pocket may form instead. These are present in duckweed and water hyacinth.

Rafflesia and striga are partial root parasites.

Haustoria is a slender projection from the root of a parasitic plant, such as a dodder, or from the hyphae of a parasitic fungus, enabling the parasite to penetrate the tissues of its host and absorb nutrients from it.

Mustlatoe is a partial stem parasite.

The association of fungus with higher plants is called mycorrhinza.

Bulbils are essential for reproduction in Oxalis. 

A corm grows vertically.

Endogenous word refers to growth of branches from the pericycle.

In yucca, each leaf ends in a very sharp pointed spine which is directed obliquely outward.

Tendrils pea plants are homologous with leaflets.

Vegetative propagation through leaves takes place in Bryophyllum and Begonia.

Rhizome remains dormant during unfavourable conditions but develops new shoots which grow form either apical or terminal bud.

Moniliform or beaded roots are those roots which are swollen at frequent intervals.

Rhizophora develops respiratory roots, which develop from underground roots. These roots are called pneumatophores. 

Adventitious buds are subnormal buds found at points along the stem. They arise from latent or dormant buds in the leaf axils of the young stem and persist for an indefinite number of years within the cortical-cambial zone.

Pulvinus leaf base is an important feature of Legume family.