Hypothetical age pyramids, Biology

Assignment Help:

Hypothetical Age Pyramids

The three types of hypothetical age pyramids which are as follows:

1) A pyramid with a broad base, indicating a high percentage of young individuals in a population. This shows that population is expanding exponentially.

2) A triangular or bell shaped pyramid indicating moderate proportion of young to old individuals. This is the characteristic of a stable population where natality equals mortality.

3) An urn shaped figure indicating a low number of young individuals. This pyramid is the characteristic of aging or declining population.

404_Hypothetical Age Pyramids.png

Figure: Three types of age pyramid showing large (1) moderate (2) and small (3) number of young individuals in a population. Vole population under laboratory conditions is shown expanding (a), and stable (b) age pyramids.


Related Discussions:- Hypothetical age pyramids

What is coronary disease, Q. What is coronary disease? The Coronary dis...

Q. What is coronary disease? The Coronary disease, or the coronary insufficiency, is a disease in which there is total or partial obstruction of one or more of the arteries tha

Special uses of biogas, S p e c i a l Uses Biogas Biogas is an im...

S p e c i a l Uses Biogas Biogas is an important renewable energy resource for rural areas. Generation of bio-gas from dung and urine is a very simple and cost-effective

Amnion adaptation to terrestrial life, Q. Why can the amnion also be consid...

Q. Why can the amnion also be considered an adaptation to terrestrial life? The amnion is as well an adaptation to dry land since one of its functions is to prevent desiccation

What do you mean by neurotransmitters, Q. What do you mean by neurotransmit...

Q. What do you mean by neurotransmitters? - Nicotinic receptors (nicotine mimics the effects of Ach here). Found at NM-junction, ANS ganglions in general. Binding of Ach to

Zoology, classification mollusca

classification mollusca

Canine parvovirus infections, Canine parvovirus infections The canine p...

Canine parvovirus infections The canine parvovirus infections are caused by a virus, which belongs to the genus Parvovirus in the family Parvoviridae. This virus is similar to

Carbon dioxide concentration in photosynthesis process, Q. Why is carbon di...

Q. Why is carbon dioxide concentration a limiting factor of the photosynthesis process? And When the carbon dioxide concentration is increased indefinitely is photosynthesis also i

Assessment of new born - purposes and precautions, Assessment of new born ...

Assessment of new born The main purposes are: i) To identify normal characteristics in the neonate ii) To identify existing abnormalities, ii any iii) To carry

Giant nerve fibres, Giant Nerve Fibres We now know that giant nerve f...

Giant Nerve Fibres We now know that giant nerve fibres take place in the central nervous system of many polychaetes, oligochaetes, insects cephalopod etc. They are broader an

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd