Question

Mention the work of different parts of the leaf ​

Answer 1

Answer:

A leaf consists of three main parts- petiole, leaf base and lamina.

• The petiole keeps the leaf blade exposed to wind and cools the leaf.
• The leaf base is a protruding part of a leaf.
• The lamina of the leaf contains veins and veinlets that provide rigidity to the leaf blade and help in the transport of mineral nutrients.

Explanation:

The petiole keeps the leaf blade exposed to wind and cools the leaf.

The leaf base is a protruding part of a leaf.

The lamina of the leaf contains veins and veinlets that provide rigidity to the leaf blade and help in the transport of mineral nutrients.

Answer 2

Explanation:

A plant has many parts. Different parts perform different functionalities. The part of the plant that appears above the ground level is called the shoot system while the part of the plant which lies underneath the soil is called the root system.

The important functions of a stem include:

• A stem carries out a number of functions essential for various processes such as photosynthesis.
• Provides a definite framework and structure to a plant which later develops into a tree.
• Support: Primary function of the stem is to hold up buds, flowers, leaves, and fruits to the plant. Along with the roots, a stem anchors the plants and helps them to stand upright and perpendicular to the ground.
• Transportation: It is the part which transports water and minerals from the root and prepared food from leaves to other parts of the plant.
• Storage: Stems are one of the storerooms of plants where the prepared food is stored in the form of starch. The stems of a few plants in the desert areas, such as Opuntia, get modified into thick, fleshy structures that store food and prevent excessive water loss due to transpiration.
• Reproduction: Few stems help in reproduction through vegetative propagation and also help to bear flowers and to produce fruits.
• Guards: Protects Xylem and phloem allowing them to perform their functions. The stem tendrils are spirally coiled and help the plant to climb support. The axillary buds also get modified into thorns that protect the plant from grazing animals.
• The stems of a few plants in the desert areas, such as Opuntia, get modified into thick, fleshy structures that store food and prevent excessive water loss due to transpiration.