1
Question
Match the following.
Match the following.
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Solution
The correct option is C a- ii; b- iii; c- iv d- i
Some plants undergo modifications of the aerial stem of either the axillary or the terminal bud to perform various functions like climbing, protection, vegetative propagation or photosynthesis. The different modifications are thorns, tendrils, phylloclades, cladodes etc.
Phylloclades are flattened or cylindrical green stems which have taken over the function of photosynthesis in desert plants like Opuntia. In Opuntia leaves are modified into spines to check transpiration.
The cladodes are leaf like in appearance with spiny tip, ovate outline and roughly parallel veins. They are green stems of limited growth which have taken over the function of photosynthesis from the leaves. The true leaves are reduced to scales or spines. In Asparagus, the cladodes are one internode long and in Ruscus the cladodes are two internode long.
Spines are straight, pointed, hard or woody structures sometimes they bear leaves, flowers or even may be branched. These are developed from axillary buds. Provide protection to the plant from grazing animals and prevents excessive transpiration. Spines are modified leaves or leaf parts.
In Bougainvillaea the thorns are curved. They help the plant in climbing.
The stem of plant or the branches are modified to green thread-like leafless structures known as tendrils and are used for climbing. These tendrils can be both branched and unbranched and a scale leaf can be seen at the point of branching. Tendrils can be subdivided into 4 types which are mentioned below: Axillary tendrils, extra axillary tendrils, apical bud tendrils and floral bud tendrils. Pumpkin have stem tendril as aerial stem modification.
Some plants undergo modifications of the aerial stem of either the axillary or the terminal bud to perform various functions like climbing, protection, vegetative propagation or photosynthesis. The different modifications are thorns, tendrils, phylloclades, cladodes etc.
Phylloclades are flattened or cylindrical green stems which have taken over the function of photosynthesis in desert plants like Opuntia. In Opuntia leaves are modified into spines to check transpiration.
The cladodes are leaf like in appearance with spiny tip, ovate outline and roughly parallel veins. They are green stems of limited growth which have taken over the function of photosynthesis from the leaves. The true leaves are reduced to scales or spines. In Asparagus, the cladodes are one internode long and in Ruscus the cladodes are two internode long.
Spines are straight, pointed, hard or woody structures sometimes they bear leaves, flowers or even may be branched. These are developed from axillary buds. Provide protection to the plant from grazing animals and prevents excessive transpiration. Spines are modified leaves or leaf parts.
In Bougainvillaea the thorns are curved. They help the plant in climbing.
The stem of plant or the branches are modified to green thread-like leafless structures known as tendrils and are used for climbing. These tendrils can be both branched and unbranched and a scale leaf can be seen at the point of branching. Tendrils can be subdivided into 4 types which are mentioned below: Axillary tendrils, extra axillary tendrils, apical bud tendrils and floral bud tendrils. Pumpkin have stem tendril as aerial stem modification.
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