MEDIUM
Earn 100

Which stage of the Demographic Transition Model is associated with low birth rates and low death rates, leading to a stable population?

50% studentsanswered this correctly

Important Questions on Nuclei

MEDIUM
In Africa, two distinct types of Rhinoceros are found. One is grazing which lives in open land and second is a browsing type which lives in wooded areas. It is which type of adaptive radiation?
MEDIUM

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): Amniocentesis for sex determination is one of the strategies of Reproductive and Child Health Care Programme.

Reason (R): Ban on amniocentesis checks increasing menace of female foeticide.

In the light of the above statements, choose the correct answer from the options given below: 

EASY
The phenomenon of evolution of different species in a given geographical area starting from a point and spreading to other habitats is called:
MEDIUM
When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt=rN1-N/K:
EASY
Assertion (A): Amniocentesis is used to detect the chromosomal defects if any, in the developing foetus.
Reason (R): Amniocentesis is a cytological study of the foetal cells for abnormal chromosomes.
EASY
Gause's principle of competitive exclusion states that:
EASY
Darwin's finches are a good example of:
EASY
Which of the following is correct for r-selected species?
EASY
The prenatal technique to determine the genetic disorders in a foetus is called
EASY
The permissible use of the technique amniocentesis is for
EASY
In which of the following interaction both partners are adversely affected?
EASY

The following factors indicate improved reproductive health of society. Choose the correct option.

1. Better detection and cure of disease

2. Better post-natal care

3. Medically assisted deliveries

4. Increased MMR

Select the code for the correct answer from the options given below:

MEDIUM
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field. A possible reason for these changes is that.


Question Image
MEDIUM
A population of finch birds with medium sized beaks colonizes an island with plants producing medium and large sized seeds. After a disease wipes out all the plants with medium sized seeds, what is most likely to happen to the finches?
EASY
If ' + ' sign is assigned to beneficial interaction, ' ' sign to detrimental and ' 0 ' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
HARD
Asymptote is a logistic growth curve is obtained when
EASY
The principle of competitive exclusion was stated by
EASY
Amniocentesis is a process to :
EASY
Amniocentesis is a diagnostic procedure to detect
MEDIUM
In the context of Amniocentesis, which of the following statement is incorrect?