Understanding life, Biology

UNDERSTANDING LIFE -

  1. Presence of protoplasm is the important feature of life which acts the site of metabolism.
  2. Maintenance of life by protoplasm requires continuous energy conversion and using energy for performance of certain vital activities.
  3. Protoplasm is made up of inorganic (81% - water 80% + minerals & gases 1%) & organic matter (19% - protein 14% + lipid 3% + carbohydrate 1% + regulatory substances as enzymes, hormones, vitamins & nucleic acid 1%)
  4. Inorganics are always micro biomolecules.
  5. Organics may be micro or macro biomolecules.
  6. C, H, O, N, P, S form about 98% of body weight of organism.
  7. O element is maximum i.e. 62%.
  8. Thus life can be defined as "the ever active and changeable state of organized matter".
  9. A living being act as an organisation so they are called organism.
  10. Living organism are morphous.

These are main characters of living beings -

1.      ORGANISATION -

(i) Protoplasmic level - e.g. Protozoa

(ii) Cellular level - e.g. Porifera

(iii) Tissue level - e.g. Coelenterata, Ctenophora

(iv) Organ system level - e.g. Platyhelminthes to Mammals

  • These levels beyond the individual organism are -

(i) Population level - All individuals of a species in a particular area.

(ii) Community level - Population of different species as plants or animals present in a particular area.

(iii) Ecosystem - Living beings inter act with non-living components.

(iv) Biosphere lelvel - Different ecosystem of all the geographical regions of the world form the biosphere.

  • Factor regulating the organisation -

(i) Aggregation - It involves grouping of smaller units to form large units.

(ii) Interaction - It involves interrelationship between different components of an aggregate.

(iii) Equilibrium - Tendency to keep a balance or stability e.g. to maintain ecological balance in nature.

(iv) Change - It is ability to show variation as different atoms as C, H, O, N, combine in different ways to form different chemical in body.

1606_understanding life.png

Posted Date: 10/8/2012 5:20:37 AM | Location : United States







Related Discussions:- Understanding life, Assignment Help, Ask Question on Understanding life, Get Answer, Expert's Help, Understanding life Discussions

Write discussion on Understanding life
Your posts are moderated
Related Questions

How do respiratory pigments act? Respiratory pigments are oxygen-carrying molecules present in the blood. When the oxygen concentration is high, for instance, in the pulmonary

Q. Using examples of invertebrate nervous systems how can the process of evolutionary cephalization be described? Considering the example of invertebrates it is observed that e

Binding of  Pigments, synthetic dye In  addition  to water, lipids and  volatile  flavours,  food proteins  can  bind  a number of other  substances  by  weak interactions  or

Explain Gluconeogenesis Gluconeogenesis (i.e synthesis of  new  glucose)  is  the  synthesis of carbohydrate from  non-carbohydrate, source. The major  substrates for glucone

explanation of examples of protozoa

Q. What is the difference between fat-soluble and water-soluble vitamins? Why can fat-soluble vitamins cause harm when ingested in excess? Water-soluble vitamins are those vita

Q. Define Left Posterior Hemiblock? Bobbna and associated reported four cases in which they proposed that the left posterior hemi block was initiated by exercise. In their pa

Q. Fiehes test and Aniline chloride test? Determine the adulteration in the given honey sample by Fiehe's test and Aniline chloride test This activity will help you to: •

In most cases, the transcription factors in eukaryotes which bind to promoter   or enhancer sequences   are activator   proteins   which induce   transcription.   That proteins gen