These plants feed upon insects. They cannot prey upon large animals and human beings. Insectivorous plants can be categorized into two broad categories:
- Active type: These insectivorous plants close their leaves and trap insects the moment they land on them.
- Passive type: These insectivorous plants possess a pitfall mechanism. For instance, a pitcher-like structure which facilitates the fall of insect from the outer to inner part of the plant, where it is digested.
Why Do Insectivorous Plants Feed on Insects?
In these plants, the energy produced due to photosynthesis is not sufficient. These plants grow in soils with deficient nutrients or in soils which are acidic in nature. Acidic soils are formed due to anaerobic (lack of oxygen) conditions which facilitate partial decomposition of organic matter. Partially decomposed organic matter transforms into acid. Most of the microorganisms that are required for the complete decomposition of organic matter cannot survive in poorly oxygenated conditions.
PARTS OF A TREE
Various parts of a tree are listed below:
Roots usually grow under the surface of the earth. They absorb water and nutrients from the soil. Water and nutrients are transported to other parts of the plant or are stored within the roots.
Crown is made up of leaves and branches. It constitutes the top of a tree. The crown provides shade to the roots, collects sunlight for photosynthesis and allows the tree to release extra water in the atmosphere, through transpiration, to manage temperature.
Leaves of a plant contain a green-coloured pigment called chlorophyll. Leaves are the food factories of a plant. The food produced in the plant leaves is either used by the various parts of a plant or is stored in branches, trunk and roots. CARNIVOROUS PLANT
Branches and Trunk
Branches and trunk enable the transfer of water, nutrients, sugar (carbohydrates) and provide storage for extra sugar. Trunk can be further divided into various parts.
Various parts of a trunk are listed below:
- Inside the trunk of a plant, there are a number of rings. Roughly with the passage of each year, a new ring is added. So, it is referred to as the annual ring.
- Rings help in determining the age of a tree (dendrochronology).
- The size of the ring helps in determining the favourable climatic conditions.
- The outside layer of the trunk is called bark. It serves as a protective layer for the tree. Trees have inner bark and outer bark. CARNIVOROUS PLANT
- The inner layer of the bark is made up of living cells and the outer layer is made up of dead cells. The inner layer is made up of phloem vessels.
- The main job of the phloem vessels is to carry carbohydrates from the leaves to the rest of the tree.
- The outer layer of the bark consists of dead cells and they store the waste of a plant. Certain useful products such as latex and scents can be obtained from the outer layer of a tree.
- It is a thin layer of living cells present inside the bark.
- It is the part of a tree, where new cells are formed, allowing the tree to increase in width.
- Sapwood consists of xylem vessels. The xylem vessels transport water and nutrients from the roots up to the leaves. CARNIVOROUS PLANT
- It is the youngest wood of a tree. Over the years, sapwood dies and becomes heartwood.
- The heartwood is the dead sapwood at the centre of a trunk.
- It is the hardest wood in a tree giving it strength. It is usually darker in colour than the sapwood.
- Pith is the tiny, dark spot made up of spongy living cells right at the centre of a trunk.
- Essential nutrients are carried through the pith.
- Its placement at the centre protects it from being damaged by insects, animals, etc.
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