Question

what are types of leaf?

Answer 1

Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized forphotosynthesis. In most leaves, the primaryphotosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf[1] but in some species, including the mature foliage of Eucalyptus,[5]palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves have distinctive upper surface (adaxial) and lower surface (abaxial) that differ in colour, hairiness, the number ofstomata (pores that intake and output gases),epicuticular wax amount and structure and other features.

Broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as theclubmosses, with different evolutionary origins, the leaves are simple, with only a single vein and are known as microphylls.[6]

Some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines. Furthermore, several kinds of leaf-like structures found in vascular plants are not totally homologous with them. Examples include flattened plant stems called phylloclades and cladodes, and flattened leaf stems called phyllodes which differ from leaves both in their structure and origin.[4][7] Many structures of non-vascular plants, such as the phyllids of mosses andliverworts and even of some foliose lichens, which are not plants at all (in the sense of being members of the kingdom Plantae), look and function much like leaves

Answer 2

Answer :

• The types of leaf include :

1. Simple
2. Compound

• The two types of compound leaf include :

1. Pinnately compound leaf
2. Palmately compound leaf

• The simple leaf includes lamina, and the incisions of the lamina does not reach the midrib breaking into leaflets.
• The compound leaf includes lamina, here the incisions reach the midrib breaking into leaflets.
• In both of the types there is a presence of bud in the axil of petiole.
• The pinnately compound leaves have a number of leaflets on the common axis, called the rachis. Ex : Neem.
• The palmately compound leaves have a number of leaflets attached to the common point that is at the tip of petiole. Ex : Silk cotton.