Concept explainers
Introduction: Leaf is a part of the plant that is thin and flat. The primary function of leaf is photosynthesis. Blade is the broad and flat portion of a leaf. Petiole is the stalk that attaches the blade to the stem. The leaves that have a simple blade are called simple leaves and the leaves that have a blade divided into two or more than two leaflets are called compound leaves.
Answer to Problem 1TYU
Correct answer: Plants with an alternate leaf arrangement have one leaf at each node.
Hence, the correct answer is option (c).
Explanation of Solution
Reason for the correct answer:
Leaf arrangement on stem
There are three possible arrangements of leaves in a stem. These leaf arrangements are as follows:
- 1. Alternate leaf arrangement: In this type of arrangement, one leaf is present at each node. Leaves are attached to the node region.
- 2. Opposite leaf arrangement: In this type of arrangement, two leaves grow at each node.
- 3. Whorled leaf arrangement: In this type of arrangement, three or more than three leaves grow at each node.
Option (c) is given as “one leaf at each node”.
In an alternate leaf arrangement, one leaf is present at each node.
Hence, the correct answer is option (c).
Reasons for incorrect answers:
Option (a) is given as, “blades divided into two or more leaflets”.
The leaves have a blade divided into two or more than two leaflets are called compound leaves.
Hence, option (a) is incorrect.
Option (b) is given as, “major veins that radiate out from one point”.
The major veins that radiate out from one point are called palmately netted.
Hence, option (b) is incorrect.
Option (d) is given as, “major veins branching off along the entire length of the midvein”.
The major vein branch off along with the full length of midvein is called pinnately netted.
Hence, option (d) is incorrect.
Option (e) is given as, “two leaves at each node”.
In an opposite leaf arrangement, two leaves grow at each node.
Hence, option (e) is incorrect.
Hence, the options (a), (b), (d), and (e) are incorrect.
In an alternate leaf arrangement, one leaf is present at each node.
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Chapter 34 Solutions
Biology (MindTap Course List)
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