FREE NEET Biology Practice MCQ Test: Organisms And Populations Exercise 1 Questions Answers With Detailed Explanations [PDF]

Answer: (b)

A biome is a major terrestrial community characterized by a distinct climate and inhabited by a particular species of plants and animals. Tundra is characterized by precipitation of less than 25 cm annually. Permafrost or permanent ice is found about a meter down from the surface, it never melts and is impenetrable to both water and roots. Savannahs are open grasslands with scattered shrubs and trees. Coniferous forest contain evergreen trees. In these forests all plants do not shed their leaves at the same time hence forest remains always evergreen. But Prairies is a grassland and epiphytes and ephemerals are found in deserts.

Answer: (b)

Answer: (a)

Answer: (a)

Answer: (b)

Predation is an interaction between members of two species in which members of one species capture, kill and eat up members of other species. Host is a term which is specifically related to parasitism. Amensalism is an interspecies interaction in which one species is harmed whereas the other one is unaffected. Parasitic organism can live both over the surface of their host or inside their body.

Answer: (d)

Answer: (b)

Age pyramid is a graphic representation of different age groups of population with pre-reproductive groups at the base, reproductive ones in the middle and post-re-productive groups at the top. In Triangular age pyramid, the number of pre-reproduction individual is very large while reproductive are moderate and post-reproductive are fewer.

Answer: (b)

The low atmospheric pressure at high altitude makes us feel sick and nauseated. This occurs due to low oxygen availability at high altitudes. Sometimes people also experience fatigue and heart palpitations.

Answer: (b)

Statements I and II are correct. But statement III is incorrect and can be corrected as If unlimited conditions are provided to a population then the population will grow quickly by increasing their birth rate (natality) and decreasing its death rate (mortality).

Answer: (b)

Answer: (c)

Answer: (a)

Answer: (d)

Plants donot have mechanism of thermoregulation to maintain that internal temperatures.

Answer: (a)

J-shape of growth pattern can be easily observed in algae blooms, some insects, annual plants and the lemmings of Tundra. In the beginning density of the population increases rapidly in compound interest fashion and then stops abruptly as the environmental resistance or other limiting factors become effective. These factors may be food, space, seasonal (frost, excessive rain etc.) or the termination of reproduction session.

Answer: (a)

Answer: (a)

Population has several characteristics or attributes which are a function of the whole group and not of an individual. Age distribution is one of them that is the number or the percentage of individuals in a population in different age groups. This is represented geometrically in the form of age pyramid.

Answer: (d)

Individuals are often found clumped about a resource.

Answer: (a)

Niche indicate the habitat of a particular species and the interaction of that species with the resources present in the habitat. Niche overlap means that two or more species sharing the resources present in a particular niche.

Answer: (b)

Answer: (a)