experiment- to study the leaf and their modification
Answers
Answer:
Explanation:
Aim Of The Experiment
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To study different modifications in roots, stems and leaves.
Theory
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Angiosperms or flowering plants are differentiated into flowers, stem, roots, and leaves. These plants bear seeds that enclose the fruit. On the basis of seed type they can be classified into:
Monocotyledonous – They have seeds with a single cotyledon.
Dicotyledonous – They have two cotyledons.
Materials Required
Forceps.
Scissors.
Hand lens.
Glass slides.
Dissecting microscope.
Sunflower/pea/mustard (complete dicot plant).
Onion/paddy/wheat/maize plant (complete monocot plant).
See Also: Leaves: Morphology, Types & Modification
Procedure
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Select a monocot plant. Dissect the plant for different parts such as stem, root, flower and leaves of this plant using scissors. Set up these different parts on separate slides with the help of forceps
Repeat the same process for a dicot plant
Make observations compare different external features of stem, root, leaves and flower of the dicot and monocot plants with the help of a hand lens and afterwards by dissecting microscope.
Observation
1) Root
Distinguish the root features:
The root is the part of the plant that typically emerges from the embryo’s radicle.
It renders rigidity against water and wind and firmly fixes the plant to the ground.
Absorption of minerals and water from the soil.
It is positively geotropic, it grows towards the centre of the gravity.
It has unicellular root hairs.
Normally, it grows away from light. It is negatively phototropic.
It does not yield leaves, buds and flowers that do not have internodes and nodes.
The root consists of four regions up till the base from the apex.
Apical meristem – cell division region.
Root cap.
Elongation region.
Maturation region.
The root cap renders protection to the developing root apex. The main growing part of the root is found just behind the root cap.
