MCQ
Which of the following would necessarily decrease the density of a population in a given habitat ?
  • A
    Natality > mortality
  • B
    Immigration > Emigration
  • Mortality and emigration
  • D
    Natality and immigration

Answer

Correct option: C.
Mortality and emigration
(C) Mortality and emigration,
Mortality and emigration - necessarily decrease the density of a population in a given habitat

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Pithecanthropus erectus fossil was found in
Given below are two statements
Statement I:
In Sphagnum male and female gametophyte are independent free living existence.
Statement II:
In Pinus male and female gametophyte are not independent free living existence.
Choose the correct answer from the option given below:
According to one of the theories of ageing, the decline and disappearance of which gland by late middle age is the primary cause of ageing
The phenotypic ratio in the $F_{2}$ gereration of dihybrid cross, is
Which of the following statements are correct for transport of carbon dioxide ?
(i) Nearly 20-25 per cent of CO2 is transported by RBCs as carbamino-haemoglobin.
(ii) 70 percent CO2 is carried as bicarbonate.
(iii) About 7 per cent of CO2 is carried in a dissolved state through plasma.
(iv) Binding of carbon dioxide with haemoglobin is related to the partial pressure of CO2
(v) pO2 is a major factor which could affect binding of carbon dioxide with haemoglobin.
(vi) When pCO2 is low and pO2 is high as in the tissues, more binding of carbon dioxide occurs whereas.
(vii) When the pCO2 is high and pO2 is low as in the alveoli, dissociation of CO2 from carbamino- haemoglobin takes place.
(viii) Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO2 to the alveoli.
The forebrain develops into
Which of the following are located in tunica media of human blood vessels?
Assertion : Plasmodium vivax is responsible for malaria.

Reason : Malaria is caused by polluted water.

According to Hardy-Weinberg principle, allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. It makes several assumptions which were given below.

$i.$  Random Mating

$ii.$  Sexual Reproduction

$iii.$  Non-overlapping Generations

$iv.$  Occurrence of Natural Selection

$v.$  Small size of population

Identify two assumptions which do not meet for a population to reach Hardy-Weinberg Equilibrium?

Match the correct
Column $- I$ Column $- II$
$(1)$ Baculo Virus $(a)$ Bacillus thuringiancis
$(2)$ Trichoderma polysporum $(b)$ Monoscus purpureus
$(3)$ Statins $(c)$ Cyclosporin$- A$
$(4)$ $BT$ Cotton $(d)$ Nucleopolyhedro
$(e)$ Saccaromyacis sariviceae