Skip to main content

What is Breathing?

Q. What is breathing? Ans. Breathing is an external process, in this process inhale of air and exhale of air. Or  Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.   Breathing is also known as external respiration. It is part of respiration but not internal or cellular respiration. The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and whose gaseous composition differs markedly from that of the ambient air . Physiological respiration involves the mechanisms that ensure that the composition ...
Post a Comment

Budding reproduction


A.  Budding (Bud=Outgrowth)

o   Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site.
o   It is most commonly associated in both unicellular and multi-cellular organisms.
o   Bacteria, yeast, corals, flatworm, jellyfish and sea anemones are some animal species which reproduce through budding.

Mechanism: Each Bud or Outgrowth arise at any plane of parent body enlarges, develops the independent life. It feeds, grows, becomes an adult and repeats the process.


a.   Unicellular organism (Yeast)
b.   Multicellular organism (Hydra)

a.     In Unicellular organism:
o   The small bud-like projection coming out from the yeast cell is called a bud. A small bud arises as an outgrowth of the parent cell.
o   Later the nucleus is separated into two parts and one of the nuclei shifts into the bud. The newly created bud divides and grows into a new cell.



b.     In Multicellular Organisms

o   Budding in Hydra involves a small bud which is developed from its parent Hydra through the repeated mitotic division of its cells.
o   The small bud then receives its nutrition from the parent Hydra and grows healthy. Growth starts by developing small tentacles and the mouth.
o   Finally, the small newly produced Hydra gets separate from its parent Hydra and becomes an independent organism.



Comments

Post a Comment

Popular posts from this blog

What is Respiration?

Q. What is Respiration? Definition : Respiration is the process by which chemical energy stored in the food is released in the form of ATP along with carbon dioxide and water. Whole the process completed inside the cell. It is also known as "cellular respiration". OR  Oxidation of food with the help of inhaled oxygen and released energy is called Respiration , it always occurs at cellular level (inside the cell). Respiration completed in two step: i. Breathing (External Respiration) : Inhale of air and exhale of air is called Breathing. Breathing is not respiration, it is part of respiration. Without breathing respiration cannot be done. ii. Metabolism (internal Respiration) Cellular Respiration : It is the process which involves exchange of oxygen and carbon dioxide between  the organisms and the environment. 
Post a Comment
Read more

What is Breathing?

Q. What is breathing? Ans. Breathing is an external process, in this process inhale of air and exhale of air. Or  Breathing (or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide.   Breathing is also known as external respiration. It is part of respiration but not internal or cellular respiration. The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and whose gaseous composition differs markedly from that of the ambient air . Physiological respiration involves the mechanisms that ensure that the composition ...
Post a Comment
Read more

what is Binary Fission? How many types of Binary Fission?

                           Asexual reproductions are following types: A.    Fission B.    Budding C.    Spore formation D.    Fragmentation E.    Regeneration F.    Gemmulation G.    Conidia formation H.    Zoospores I.     Vegetative propagation A.   Fission (Fission=division) It is type of Asexual reproduction in which a fully-grown parent cell divides into two or more than two daughter cells. In this, the reproductive unit is whole parental body. Types of Fission: On the basis of number of off-springs produced, fission reproduction is divides into two categories:   (a)       Binary Fissio n Definition: I t is division of adult parental body into two nearly equal daughter cells during favorable condition. Occurrence: It is the simplest and mos...
Post a Comment
Read more