Question

DO NOT WRIFE ON THE TEST of all carbon in living organisms is B) carbon dioxide from atmosphere and water D) sedimentary rocks bacteria A) broaation of tundra is dominated by B) short plants such as sedges, heaths, and willow D) sclerophyllous broadleaf evergreen shrubs. evergreen trees 01. Classification of the A) True major world's major terrestrial biomes is based on the dominant forms of plant life. B) False 92. The major natural ecosystem of the central United States (lowa, Kansas, Nebraska) was E) tundra. forest B) deciduous forest C) desertgrasland Use the following information to answer the next 4 questions r- b-d dN/dt- rN OLNEY Gray squirrels (Sclurus carolinensis) are common throughout the Eastern and Midwestern United States. Although this species is normally gray, rare instances of white individuals exist and are considered Tucky"by many people. These white individuals are albinos-meaning that a mutation prevents them from making melanin, the pigment used to color their coat and eyes, which provides camouflage and protection from the sun. Genetic traits for this condition are recessive. Albino squirrels are found much more commonly in urban areas, where populations can be relatively high. For instance, in Olney, Ilino albino squirrels are legally protected from cats, motorists, and squirrel-nappers and approximately 200 albino squirrels are present within the city limits (5 square kilometer land area). Over the course of on year, 50 squirrels were born and 20 squirrels died. 93. What is the population density (individuals per unit area) of albino grey squirrels in Olney Ohio? A) 1000 individuals / km D) 20 individuals /km2 B) 100 individuals/ km2 E) 10 individuals/km2 C) 40 individuals/km 94. What is the intrinsic growth rate (r) for the population? A) 0.5 squirrels/squirrel/year B) 5 squirrels/squirrel/year C) 0.15 squirrels/squirrel/year D)-0.15 squirrels/squirrel/year 95. What is the change in the population (dN/dt) for the squirrel population assuming unlimited A)-30 squirrels B)30squirrels C) 20 squirrels D)-20 squirrels 96, What is the population size (N) at the end of the year? A) 170 squirrels B)230 squirrels )220 squirrelsD) 180 squirrels

Answer 1

89] Option [b] carbon di oxide from atmosphere and water

This is so because the autotrophs in the ecosystem use the CO2 to synthesise food by photosynthesis . CO2 and H2O combine to form glucose which is the precursor of all other forms of food. And this is how, the carbon gets assimilated in living beings.

90 ] Option [b] short plants such as sedges, heaths and willows.

Tundra region is extremely cold and does not support much vegetation. This region is found around the poles and at very high altitudes. Broad leaved plants cannot survive in such a climate.

91] True

Because, the type of vegetation plays a major role in determining the animal life of that region . Also, the climate of the region decides the type of vegetation. Climate and vegetation are closely linked to each other and hence the different biomes on the earth can be divided on the basis of vegetation.

92] Option [ d] grassland

The climate of the region favors this type of vegetation. Scanty rainfall and extremes of temperature to not favor the growth of tall trees .

93] Option [ c] 40 individuals /km2

Because density = total population/ area

200/ 5km2 = 40 individuals/km2