☰
Morphology of Flowering Plants
Justify the following statements on the basis of external features:
(i) Underground parts of a plant are not always roots.
(ii) Flower is a modified shoot.
(i) Underground parts of a plant are not always roots: There are certain plants like potato , ginger turmeric in which the stem is modified for the storage of the food and is found underground. In these, the stem becomes swollen due to storage of food. The potato bears eyes, which are subtended by a leaf scar. Basal leaves in onions become fleshy because of the accumulation of food and are found under the ground. Since stem, leaves can be modified to be found underground, we can say that the underground parts of the plant are not always roots.
(ii) Flower is a modified shoot: The shoot apical meristem changes to floral meristem. The axis of the stem gets condensed, while the internodes lie near each other. The apex produces different kinds of floral appendages laterally at successive nodes of the leaves. Instead of leaves, various floral appendages arise from the node. Therefore, the flower can be said to be a flower is a modified shoot.
Sponsor Area
Define the following terms:
(c) actinomorphic
Define the following terms:
(d) zygomorphic
Define the following terms:
(e) superior ovary
Define the following terms:
perigynous flower
Define the following terms:
epipetalous stamen
Define the following terms:
(a) Racemose and cymose inflorescence
Define the following terms:
(b) Fibrous root and adventitious root
Define the following terms:
(c) Apocarpous and syncarpous ovary
Draw the labelled diagram of the following:
(i) Gram seed (ii) V.S. of maize seed
Describe modifications of stem with suitable examples.
Sponsor Area
Sponsor Area