Question

What is growth??? ELABORATE this topic!!

Answer 1

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Growth, the increases in cell size and number that take place during the life history of an organism.

$\large{ \bold{ \green{ \: process \: of \: growth...}}}$

Growth is seldom random. Rather, it occurs according to a plan that eventually determines the size and shape of the individual. Growth may be restricted to special regions of the organism, such as the layers of cells that divide and increase in size near the tip of the plant shoot. n the latter case, the rates of cell division and of the increase in cell size differ in different parts.

Growth is seldom random. Rather, it occurs according to a plan that eventually determines the size and shape of the individual. Growth may be restricted to special regions of the organism, such as the layers of cells that divide and increase in size near the tip of the plant shoot. n the latter case, the rates of cell division and of the increase in cell size differ in different parts. The rate of growth of various components of an organism may have important consequences in its ability to adapt to the environment and hence may play a role in evolution. For instance, an increase in the rate of growth of fleshy parts of the fish fin would provide an opportunity for the fish to adapt more easily to terrestrial locomotory life than could a fish without this modified fin. Without disproportionate growth of the fin—ultimately resulting from random changes in the genetic material (mutations)—the evolution of limbs through natural selection might have been impossible.

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$\bold{ \blue{ in \: cells}}$

The increase in size and changes in shape of a developing organism depend on the increase in the number and size of cells that make up the individual. Increase in cell number occurs by a precise cellular reproductive mechanism called mitosis.

$\blue{ \bold{ in \: plants...}}$

The very young developing plant embryo has many cells distributed throughout its mass that undergo the cycle of growth and cell division. As soon as the positions of the root tip, shoot tip, and embryonic leaves become established, however, the potential for cell division becomes restricted to cells in certain regions called meristems. One meristematic centre lies just below the surface of the growing root; all increases in the number of cells of the primary root occur at this point. Some of the daughter cells remain at the elongating tip and continue to divide. Other daughter cells, which are left behind in the root, undergo the increase in length that enables the new root to push deeper into the soil. The same general plan is evident in the growing shoot of higher plants, in which a restricted meristematic region at the tip is responsible for the formation of the cells of the leaves and stem; cell elongation occurs behind this meristematic centre.

$\blue{ \bold{ in \: animals...}}$

The growth of animals is more restricted in time than is that of plants, but cell division is more generally distributed throughout the body of the organism. Although the rate of cell division differs in different regions, the capacity for cell division is widely distributed in the developing embryo. Increase in size is rapid during the embryonic period, continues at a reduced rate in juveniles, and thereafter is absent. Cell division and size increase continue, however, even after increase in total body size no longer occurs. Height increase in mammals is limited by cessation of cell division and bone deposition in the long bones.Some organs retain the potential for growth and cell division throughout the life span of the animal.

The growth of animals is more restricted in time than is that of plants, but cell division is more generally distributed throughout the body of the organism. Although the rate of cell division differs in different regions, the capacity for cell division is widely distributed in the developing embryo. Increase in size is rapid during the embryonic period, continues at a reduced rate in juveniles, and thereafter is absent. Cell division and size increase continue, however, even after increase in total body size no longer occurs. Height increase in mammals is limited by cessation of cell division and bone deposition in the long bones.Some organs retain the potential for growth and cell division throughout the life span of the animal. The rates of both growth and cell division can vary widely in different body parts. This differential increase in size is a prime factor in defining the shape of an organism.

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Answer 2

-: Growth :-

Increase in mass and overall increase in size of a tissue or organism or it's part .

Growth is the non defining feature of a living organism.

➡️ increase in mass and increase in number of an organism is TWIN CHARACTER of growth.

➡️ Irreversible permanent increase in size of an organism or it's part or even of an individual cell.

➡️ Growth is the result of Metabolism.

Growth is of four types :-

➡️ Intrinsic - defining feature.

➡️ Extrinsic - defined part or accumulation on material on any body surface.

➡️ Interminant :- unlimited. eg , Plants.

➡️ Determinent :- Limited. eg, Animals

More about growth :-

if synthetic reaction or Anabolism increases and destructive reaction or Catabolism decreases then it is termed as Growth.

if synthetic reaction or Anabolism decreases and destructive reaction or Catabolism increases then it is termed as Degrowth or negative growth.