Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Natality Rate - Natality
Natality rate or birth rate is determined by dividing the number of individuals born by unit time and is expressed as follows:
Natality rate = ΔNn / Δt
Δ Nn = production of new individuals in a population
Δ t = unit time
Natality rate can also be determined as the number of new individuals per unit of time per unit of population. This is called specific natality rate and can be expressed as:
Natality rate per unit of population = ΔNn / N Δ t
N may represent the total population or only the reproductive part of the population, i.e. females, for example, in higher organisms natality rate is per female. Natality rate is zero or positive but never negative. The measurement of natality or birth rate is highly dependent on the type of organism being studied. Some species breed once a year, some breed several times a year and others breed continuously. Some produce many seeds or eggs, and others few.
For example, a single oyster can produce 55 to 114 million eggs, whereas birds usually lay between 1 and 20 eggs. Also the specific natality rate differs for individuals of different age groups in the population. For example in a rabbit population for 1 to 2 year old females the specific natality rate is average 4 young ones per year per female, while for females of less than 1 year the rate is 1.5 on an average. Since natality is the concept referring to the population and not to the isolated individuals, the average reproductive capacity should be taken as the measure of natality, and not the capacity of the most productive or least productive individuals.
classification
Define Procedure for Standardization of HCl for Saponification Number of Fats? Precisely weigh 2.65 g of anhydrous sodium carbonate and transfer it to 100 ml volumetric flask.
Define Role in protein metabolism and growth? Severe vitamin A deficiency results in abnormal RNA metabolism and protein synthesis and hence interferes with growth. Hence vitam
What are the problems that vertebrates required to solve to adapt to the terrestrial environment as they came from the aquatic habitat? How evolution does solve those problems?
The vertebral bodies are much larger in the lower back than the neck. What is the functional significance of this structural difference?
Why Physical Fitness is Tested? 1) To assess pre-training fitness status: Before beginning an exercise programme and allow the exercise, intensity and duration to be set at th
Explain the Development of Cancer? Are you interested in knowing how cancer develops? Well here it is. The cancer development is a process involving initiation, promotion and p
Q. What is the difference between venous and arterial blood? Arterial blood is the oxygen-rich and carbon dioxide-poor blood that irrigates the tissues. Venous blood is the oxy
Q. How Cleaning agents works? Food particles and other debris provide good nutrients for the nlicroorganisms to grow. In fact, the food particles protect microorganisms d
What are two things that enter the cell for cellular respiration? Carbohydrate molecules and oxygen enter the cell during cellular respiration.
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd