Plant Growth and Development
What is Growth?
- It is a characteristic of living beings in which an irreversible permanent increase in size of an organ or its parts occur. In smaller living beings, an increase in the size of a cell can also be termed as growth.
Characteristics of Plant growth
Plant Growth is Indeterminate
- Plants retain the capacity of unlimited growth throughout life.
- Meristems are present in plants that have the ability to divide and self perpetuate.
- Open form of growth − New cells are always being added to the plant by meristem.
- Primary Growth − Occurs due to root apical meristems and shoot apical meristems
- Secondary growth − Occurs due to the appearance of lateral meristems, vascular cambium, and cork cambium later in the life of certain dicots and gymnosperms
Plant Growth is Measurable
- Growth is measured by measuring the parameters that are directly proportional to increase in protoplasm.
- Increase in weight (fresh and dry weight both), length, area, volume, and cell number are some parameters.
- Choice of parameters depends upon type of plant.
For pollen tube − length is the parameter
For water melon − cell size is used
For dorsiventral leaf − surface area is used
This, means that seed germination is the first step in the growth of plants. Lets study more about seed germination.
It is the first step in the process of growth of plants.
Seed germination requires certain necessary conditions necessary like availability of water and oxygen. In the absence of these, the seeds may fail to germinate.
The steps of seed germination include -
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