Praying mantis is a good example of camouflage. Camouflage is the natural colouring of an animal which enables it to blend in with its surroundings. A praying mantis, or praying mantid, is the common name for an insect of the order Mantodea. Often mistakenly spelled praying mantis (a tempting mistake, as they are notoriously predatory) they are in fact named for the typical “prayer-like” stance. The word mantis derives from the Greek word mantis for prophet or fortune teller.

A praying mantis from India

Correct Option: C

Praying mantis is a good example of camouflage. Camouflage is the natural colouring of an animal which enables it to blend in with its surroundings. A praying mantis, or praying mantid, is the common name for an insect of the order Mantodea. Often mistakenly spelled praying mantis (a tempting mistake, as they are notoriously predatory) they are in fact named for the typical “prayer-like” stance. The word mantis derives from the Greek word mantis for prophet or fortune teller.

A praying mantis from India

At an altitude of 5400 meters the low atmospheric pressure of O₂ will be very low, so the solubility of oxygen in the blood will be very less hence the oxygen carried by each RBC will be too less. But to fulfill the oxygen requirement of the body, blood has to carry more oxygen to the body tissue and this is done by the increased no. of RBCs.

Correct Option: A

At an altitude of 5400 meters the low atmospheric pressure of O₂ will be very low, so the solubility of oxygen in the blood will be very less hence the oxygen carried by each RBC will be too less. But to fulfill the oxygen requirement of the body, blood has to carry more oxygen to the body tissue and this is done by the increased no. of RBCs.

Gene flow is the spread of genes through populations as effected by movements of individual and their propagules, e.g. seeds spores etc. Gene flow ensures that all populations of a given species share a common gene pool. i.e. it reduces difference between populations. The interruption of gene flow between populations is a prerequisite for the formation of new species.

Correct Option: B

Gene flow is the spread of genes through populations as effected by movements of individual and their propagules, e.g. seeds spores etc. Gene flow ensures that all populations of a given species share a common gene pool. i.e. it reduces difference between populations. The interruption of gene flow between populations is a prerequisite for the formation of new species.

In the sigmoid growth curve growth is slow in the lag phase. Growth rate remains stable during the stationary phase and it declines during the senescent phase. Growth increases logarithmically during the exponential phase.

Correct Option: D

In the sigmoid growth curve growth is slow in the lag phase. Growth rate remains stable during the stationary phase and it declines during the senescent phase. Growth increases logarithmically during the exponential phase.

Demography is the study of population in all aspects. Fertility refers to the number of children per couple. Mortality rate is the average number of natural deaths per unit population per unit time. Age distribution refers to the proportionate occurrence of individuals of the three age groups. Developing countries usually have high rate of population growth, because of increasing fertility and declining mortality.

Correct Option: A

Demography is the study of population in all aspects. Fertility refers to the number of children per couple. Mortality rate is the average number of natural deaths per unit population per unit time. Age distribution refers to the proportionate occurrence of individuals of the three age groups. Developing countries usually have high rate of population growth, because of increasing fertility and declining mortality.