Question:

Growth can be measured in various ways. Which of these can be used as parameters to measure growth ?

Updated On: Jul 6, 2022
  • Increase in cell number
  • Increase in cell size
  • Increase in length and weight
  • All the above
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The Correct Option is D

Solution and Explanation

Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm. Growth is, measured by a variety of parameters such as (i) Increase in length, e.g., stem, root, pollen tube, (ii) Increase in volume e.g., fruits, (iii) Increase in area, e.g., leaves, (iv) Increase in diameter, e.g., tree trunks, fruits, (v) Increase in fresh or dry weight. One single maize root apical meristem can give rise to more than $17,500$ new cells per hour, whereas cells in a watermelon may increase in size by upto $3,50,000$ times. In the former, growth is expressed as increase in cell number; the latter expresses growth as increase in size of the cell.
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Notes on plant growth and development

Concepts Used:

Plant Growth and Development

Growth in Plants:

Plants have the distinctive ability to grow throughout their life. The meristem cells present there in the roots and shoot apical lead to the primary growth of the plant. The primary growth which happens or takes place at the tips of the stem and roots of the plant contributes to the elongation of the plant along its axis.

In the later stages of growth in plants, the growth in dicotyledonous, vascular cambium, gymnosperms, and cork-cambium are also caused by the existence of meristems in them. These intercalary meristems are put up to increase the girth of the organs of the plant in which they are active. Such type of growth is commonly known as secondary growth.

Many parameters such as area, volume, fresh weight, cell number, dry weight, length, etc are utilized to measure the growth in plants as increase in the amount of protoplasm is responsible for the growth in plants.

Read More: Plant Growth and Development