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The correct answer is (d) EMIGRATION

Easy explanation: An emigration is an ACT of leaving one’s own country and settling or RESIDING in another country (abroad) permanently. The population DENSITY decreases when emigration is more.

The correct answer is (c) 1,028,737,436

To elaborate: The POPULATION of India according to the 2001 census is 1,028,737,436. Population Census is the TOTAL process of COLLECTING, compiling, ANALYZING demographic, ECONOMIC and social data about the members of a given population.

Right choice is (b) India

The EXPLANATION is: India is the second-largest populous COUNTRY in the world. The population of India according to the 2011 census is 1,210,854,977. China is a top-most populous country in the world.

The correct answer is (d) GROWTH rate

To elaborate: The growth rate is an increase in POPULATION due to an ACTUAL NUMBER of individuals added to the population. It is the PERCENTAGE change of a population within a specific time period.

Correct CHOICE is (c) 1,210,854,977

To explain I would say: The POPULATION of India according to the 2011 census is 1,210,854,977. Population census is the process of collecting, compiling, analyzing DEMOGRAPHIC, economic and SOCIAL data about the members of a GIVEN population.

Right answer is (d) Every 10 years

The EXPLANATION is: Census is CARRIED out every 10 years. Population census is the PROCESS of collecting, COMPILING, analyzing demographic, economic and social data about the members of a given population.

Right choice is (c) Birth rate

The explanation: Immigration contributes more to the population growth than the birth rate in a new habitat which is just being colonized. Immigration is responsible for fluctuation in population density. It is an ACT of coming into a DIFFERENT country of which they are not NATIVES and reside permanently.

The CORRECT choice is (a) Emigration

Explanation: Under SPECIAL conditions emigration is responsible for fluctuating population DENSITY. Emigration is an act of leaving one’s own country and settling or RESIDING in another country (abroad) permanently.

Correct option is (a) Emigration

Easy explanation: The emigration is responsible for FLUCTUATION in POPULATION density. The population density DECREASES when emigration is more. Emigration is an act of leaving ONE’s own country and SETTLING or residing in another country (abroad) permanently.

The CORRECT choice is (B) E

Best explanation: The LETTER used to designate emigration is ‘E’. Emigration is an act of leaving one’s own country and settling or RESIDING in another country (abroad) PERMANENTLY.

Right CHOICE is (C) Deaths

The best I can explain: Under normal conditions, the population density is influenced by deaths in an area at a specific time i.e. death RATE (mortality). It is the NUMBER of INDIVIDUALS died in a population at a specific time.

The correct answer is (c) Emigration is more

Easy explanation: The population density decreases when emigration is more. Emigration is an act of leaving ONE’s own country and settling or RESIDING in another country (ABROAD) PERMANENTLY.

Correct choice is (d) Immigration

The EXPLANATION: Immigration is responsible for FLUCTUATION in POPULATION density. It is an act of COMING into a different COUNTRY of which they are not natives and reside permanently. This increases the population density of an area where they are residing.

Right answer is (d) I

Best EXPLANATION: Immigration is designated by the letter ‘I’. Immigration is RESPONSIBLE for FLUCTUATION in POPULATION density. It is an act of coming into a different country of which they are not natives and reside PERMANENTLY.

Right option is (B) D

The best explanation: The mortality (death rate) is designated by ‘D’. It is the NUMBER of individuals DIED in a population at a specific TIME. For humans, it is described as a number of deaths PER 1000 of the population per year.

Right answer is (c) IMMIGRATION is more

Explanation: Population density increases when there is an INCREASE in immigration. It is an ACT of coming into a different country of which they are not natives and reside permanently. This increases the population density of an AREA where they are RESIDING.

The correct CHOICE is (d) Mortality

Best explanation: Mortality is responsible for fluctuation in population density. It is the number of INDIVIDUALS died in a population at a SPECIFIC time. For HUMANS, it is described as a number of DEATHS per 1000 of the population per year.

Correct choice is (a) B

For explanation: Natality (BIRTH rate) is DESIGNATED by the letter ‘B’. It is the number of individuals BORN in a population at a specific time. For humans, it is described as a number of individuals born PER 1000 of the population per year.

The correct OPTION is (b) Birth rate

The explanation is: Among the given above birth rate is a POPULATION attribute. It is the number of individuals born in a population at a SPECIFIC TIME. For humans, it is described as a number of individuals born per 1000 of the population per year.

Correct option is (B) Sexually as well as asexually reproducing organisms

For explanation I WOULD say: For ecological STUDIES of population, both sexually as well as asexually reproducing organisms are considered. The organisms formed from sexual reproduction are genetically different (except homozygotic twins). The organisms produced by ASEXUAL reproduction are genetically as well as morphologically similar.

Right option is (a) ECOLOGY, population GENETICS, and evolution

To elaborate: Population ecology is a SUBJECT that studies the reasons, factors AFFECTING population and how population change over time. It is important for biology conservation and it links ecology with population genetics and evolution.

The CORRECT choice is (d) Steady population

The explanation: The FOLLOWING PYRAMID indicates a steady population. It is a bell-shaped pyramid in which the individuals in pre-REPRODUCTIVE and reproductive age are almost EQUAL while fewer individuals are present in post-reproductive age.

Correct choice is (B) Expanding population

The best I can EXPLAIN: The following pyramid INDICATES the expanding population. It is a TRIANGULAR AGE pyramid in which the individuals in pre-reproductive age are more, moderate in reproductive age while fewer individuals are present in post-reproductive age.

Right answer is (B) DECLINING population

Explanation: The population has a large NUMBER of individuals in a post-reproductive age is CALLED a declining population. It is so-called because there will be fewer births and more deaths thus indicating NEGATIVE population growth.

Correct answer is (c) Steady population

The best I can EXPLAIN: The population has the same number of individuals in the pre-reproductive post-reproductive age is CALLED a steady population. It is the population in which the birth rate is APPROXIMATELY EQUAL to the DEATH rate.

Right answer is (c) GROWING POPULATION

The explanation is: The population having a LARGE number of individuals in the pre-reproductive age is called a growing population. It is so-called because fertile females can give rise to more children thus increasing the population.

The correct answer is (d) 50 years and above

Easiest explanation: The individuals above 50 years fall under the category of post-reproductive age. These are the years during which female FERTILITY declines and have fewer CHANCES of BEARING children.

The correct answer is (d) 0-14 years

The best I can explain: The pre-reproductive AGE is 0-14 years. It is the age before PUBERTY. It is the age before females BECOME fertile and can carry CHILDREN.

Correct ANSWER is (c) 15-49 YEARS

For explanation I would say: The AGE individuals of 15-49 years are considered as the REPRODUCTIVE age group. It is the age group in which females become fertile and have the child-bearing capacity.

Correct answer is (B) The number of individuals in a unit area in a unit TIME

To explain: The population DENSITY TELLS about the number of individuals in a unit area at a specific time. It is a geographical TERM. Countries with high population density are said to be over-populated.

Correct OPTION is (b) Dynamics of population

Explanation: The HUMAN population is dynamic. THUS the changing nature of the human population is called the dynamics of the human population. The dynamic studies include the size and age COMPOSITION of the human population.

Correct answer is (d) Demography

The BEST explanation: The demography is the study of QUANTITATIVE and statistical aspects of the human POPULATION. The study of statistics such as deaths, births, income, INCIDENCES of various DISEASES is included. This study tells about the changing structure of the human population.

Right choice is (B) Population

Explanation: The population is the level of the ORGANIZATION after an organism. VARIOUS organisms COME together and start residing at the same place known as population. It has organisms of the same species.

Correct answer is (a) HOMO sapiens

The best I can EXPLAIN: Humans belong to the species of Homo HABILIS. It lived APPROXIMATELY between 2.1-2.4 and 1.5 million years ago. It is an archaic species that lived in the EARLY Pleistocene. Today’s human species is called Homo sapiens.

The correct option is (d) BIRDS

To elaborate: Hollow body with pneumatic or spongy bones is a FEATURE of birds. They have boat-shaped sternum, thin CRANIAL bones, and beaks that help in the reduction of body weight by providing lightness to ease FLIGHT.

Correct option is (a) Birds

Easiest EXPLANATION: Only left ovary and oviduct are present in birds. Many organs such as RIGHT ovary and oviduct, gall bladder, urinary bladder are EITHER absent or vestigial to reduce body weight, provide lightness and ease in flying.

Correct CHOICE is (b) Volant

For explanation I would say: The adaptation for flying or gliding is called volant adaptation. These ANIMALS have lighter bodies as compared to other species. These organisms have WINGS with feathers, hollow spongy bones along with larger HEARTS.

Correct answer is (B) Aquatic

For explanation I would say: The adaptation for aquatic life is called aquatic adaptation. They have large spindle-shaped STREAMLINED BODIES. Their skin is rich in mucous GLANDS and has gills for the absorption of DISSOLVED oxygen.

The CORRECT option is (c) Streamlined bodies and SCALES

Explanation: Streamlined bodies with scales are a CHARACTERISTIC feature of fishes. They have gills for the absorption of dissolved OXYGEN and also have an AIR bladder that helps in floating in the water.

Correct answer is (d) Desert adaptation

To ELABORATE: The adaptation for survival in the desert is called desert adaptation. It is a mode of life in extreme TERRESTRIAL habitats. These animals have thick and HARD SKIN and are nocturnal. They have a longer loop of HENLE for more water reabsorption.

Right answer is (c) CAMEL

Easiest explanation: Camel is an animal adapted for desert adaptation. It stores WATER in all body TISSUES. They also have a hump MADE up of fatty tissue. They have longer Henle’s loop in kidneys.

Right CHOICE is (c) Monkey

Explanation: Monkey is an EXAMPLE of arboreal adaptation. It has strong and stout limbs, LONG prehensile tail along with opposable DIGITS. Because of these ADAPTATIONS they can easily climb on trees, walls.

Correct answer is (d) Hind limbs PROVIDED with longer toes

To explain I would SAY: Hind limbs provided with longer toes are a characteristic of arboreal adaptation. Along with this arboreal ANIMALS have a long prehensile TAIL (monkeys) with strong and stout limbs. They also have opposable digits (marsupials) and elongated CLAWS (squirrels).

Correct answer is (b) ARBOREAL

The best I can explain: The adaptation for climbing and BALANCING is known as arboreal adaptation.It is also known as scansorial adaptation. It is used by animals for climbing on trees, rocks, WALLS, etc. This type of adaptation is shown by monkeys, sloths, CHAMELEONS, koalas, etc.

The CORRECT answer is (c) Cursorial

The explanation is: The adaptation for RUNNING is known as cursorial adaptation. It is an adaptation for FAST running to find hiding places for protection from various predators. Some examples of cursorial animals are deer, HORSE, cockroach, LEOPARD, etc.

The correct answer is (d) Terrestrial

The explanation: The modifications of the organisms living on the LAND for their SURVIVAL called terrestrial ADAPTATIONS. It is exhibited by all organisms, plants as well as animals. These adaptations are for VARIOUS BIOLOGICAL activities.