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In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues -
A
Stem and root
B
All parts
C
Shoot tips and root tips
D
Flowers, fruit and leaves
Detailed Solution
Primary tissues are formed by the activity of the apical meristems; secondary tissues are formed by the lateral meristems (vascular cambium and cork cambium).
In a woody dicot tree, the stem and the root undergo extensive secondary growth, so they consist mainly of secondary tissues (wood and bark).
Leaves, flowers and fruits are lateral appendages of limited growth; they do not have a cambium that forms secondary tissues, so they consist mainly of primary tissues throughout their life.
The shoot tips and root tips are also primary, but they are only small regions of the stem and root.
So, as given in the answer key, the parts that mainly consist of primary tissues are the flowers, fruits and leaves.
In a woody dicot tree, the stem and the root undergo extensive secondary growth, so they consist mainly of secondary tissues (wood and bark).
Leaves, flowers and fruits are lateral appendages of limited growth; they do not have a cambium that forms secondary tissues, so they consist mainly of primary tissues throughout their life.
The shoot tips and root tips are also primary, but they are only small regions of the stem and root.
So, as given in the answer key, the parts that mainly consist of primary tissues are the flowers, fruits and leaves.