Question

79		There are many exceptions to the classic pyramids, but the pyramid of _________ may never be inverted. a).   .Numbers B).   .biomass c).   .Carnivores d).   .Energy
80		Transistional cultures: population growth slows or stops slow population growth population growth increases rapidly population growth slow / static

92

Which is not an exotic species in the Great Lakes Watershed?      A)zebra Mussel      b) sea lamprey      c) purple loosestrife      d) None of the above

22		Approximately _______ percent of the energy available at one trophic level is converted into new biomass in the next trophic level a).   5 b).   10 c).   25 d).   75
23		_______________ are the first link in any food chain. a. Consumers                                     b. Predators                                      c. Prey                                              d. Producers
24		Autotrophs a. might carry on chemosynthesis. b. might carry on photosynthesis. c. can live without heterotrophs. d. all of the above.

Answer 1

SOLUTION:

79. OPTION (d) IS CORRECT. Pyramid of energy may never be inverted

Pyramid of energy shows that there is a decrease in energy when it moves from lowe trophic level to higher tropic level. Hence pyramid of energy is always upright.

80. OPTION (b) IS CORRECT.(Slow population growth)

Transistional cultures also called demography transistion.

The study of the group characteristics of a population, their changes over time and predication of future changes is known as demography

NOTE;

QUESTION 80 : Option is inappropriate

92. OPTION (d) IS CORRECT: NONE OF THE ABOVE.

Exotic species are also known as alien species,invasive species, non-indigenous species are species of plants or animals that are growing in a non-native environment.

An invasive species is a plant or animal that is foreign to an ecosystem.These changes greatly affected the economy,health and food.

• ZEBRA MUSSEL
• SEA LAMPREY
• PURPLE LOOSESTRIFE

These species is not an exotic species in the Great Lakes Watershed.

22.Option (b) is COORECT: 10(ten)

Approximately 10 percent of the energy available at one trophic level is converted into new biomass in the next trophic level.

Trophic efficiency(10 PERCENT LAW) states that the efficiency of energy transfer from one trophic level to the next trophic level to the next is about 10%.

10% available energy is transferred from primary producers to primary consumers(herbivores).

23.OPTION(d) IS CORRECT: PRODUCER are the first link in any food chain.

PRODUCER (eg.Grass)-------->HERBIVORES(eg. Insect)------->Primary carnivore(eg.Frog)------->SECONDARY CONSUMER(eg. Snake).

Food chains begin with photosynthesis plants (primary producers).

24. OPTION (d) is CORRECT: (ALL OF THE ABOVE)

Autotrophs are organism prepare their own food by using light (photosynthesis) and chemical(chemosynthesis).

• ​​​​​​​ photosynthesis: Prepare their own food by using sunlight.
• Chemosynthesis: Prepare their own food by using chemical.

Autotroph can live without heterotrophs (But in actual without heterotrophs, autotrophs cannot survive for long time because it need carbon dioxide.)

For example, Considered as heterotrophs, without decomposers to recycle nutrients, autotrophs will lack the nutrient to undergo photosynthesis - organic waste. This will lead to the death of autotrophs.