`color{blue} ul(mathtt (GROWTH"))` :The irreversible increase in the mass of the living body or/ and the number of cells.
'`\color{green} ✍️ \color{green} \mathbf(KEY \ CONCEPT)`
● Growth can be understood as an increase in mass or an increase in number or both.
● Increase in cell number occurs by means of `color{Violet}"cell division"`, in both unicellular and multi cellular organisms. In plants, this growth by cell division occurs continuously throughout their life span (`color{Violet}"Indeterminate Growth)"`. In animals, this growth is seen only up to a certain age `color{Violet}"(Determinate growth)"`. Although in certain tissues, cell division does occur throughout the life to replace lost cells.
● In majority of higher animals and plants, growth and reproduction are `color{Violet}"mutually exclusive events"`. Here cells stop growing during cell division and vice versa.
● If increase in body mass is considered as a criterion for growth, then non living objects like mountains, boulders and sand mounds grow too. However, this kind of growth exhibited by non-living objects is by accumulation of material on the surface (`color{Violet}"Extrinsic Growth)"`. In living organisms, growth is from inside (`color{Violet}"Intrinsic Growth)"`.
● Therefore, `color{Brown}"Growth, cannot be taken as a defining property of living organisms"`. Only after carefully observing the conditions in which growth occurs, it is understood that it a characteristic of only living organisms as dead organisms do not grow.
`color{blue} ul(mathtt (GROWTH"))` :The irreversible increase in the mass of the living body or/ and the number of cells.
'`\color{green} ✍️ \color{green} \mathbf(KEY \ CONCEPT)`
● Growth can be understood as an increase in mass or an increase in number or both.
● Increase in cell number occurs by means of `color{Violet}"cell division"`, in both unicellular and multi cellular organisms. In plants, this growth by cell division occurs continuously throughout their life span (`color{Violet}"Indeterminate Growth)"`. In animals, this growth is seen only up to a certain age `color{Violet}"(Determinate growth)"`. Although in certain tissues, cell division does occur throughout the life to replace lost cells.
● In majority of higher animals and plants, growth and reproduction are `color{Violet}"mutually exclusive events"`. Here cells stop growing during cell division and vice versa.
● If increase in body mass is considered as a criterion for growth, then non living objects like mountains, boulders and sand mounds grow too. However, this kind of growth exhibited by non-living objects is by accumulation of material on the surface (`color{Violet}"Extrinsic Growth)"`. In living organisms, growth is from inside (`color{Violet}"Intrinsic Growth)"`.
● Therefore, `color{Brown}"Growth, cannot be taken as a defining property of living organisms"`. Only after carefully observing the conditions in which growth occurs, it is understood that it a characteristic of only living organisms as dead organisms do not grow.