6) Natural selection (circle only 1): a. b. c. Requires genetic variation among

Question

6) Natural selection (circle only 1): a. b. c. Requires genetic variation among organisms; Can only occur over long time periods; Requires phenotypic plasticity in organisms; d. Is only effective when there are large differences in survival or reproduction among organisms; e Is important in the evolution of species and doesn't occur after speciation; a. Allows plants to achieve the same net carbon gain under different water conditions; b. Is constant within species; c. Depends primarily on the amount of incident radiation; d. Shows both genetic variability and phenotypic plasticity e. Depends primarily on the amount of water or nutrients; f Depends only on the amount of available water 7) The allocation of aboveground and belowground biomass by a plant (circle 2): 8) Referring to the picture below (only 1 answer for each section): A (I point) Which species has the greatest potential amount of photosynthesis: B (2 points) Which species has the broadest tolerance for water stress: C (3 points) Which species would b a. Speckled alder; b. White ash; c. Red oak; b. Speckled alder; b. White ash; c. Red oak; e the poorest competitor in wet environments (more positive water potential) Speckled alder; b. White ash; c. Red oak; c. D (3 points) Which species would be the best competitor in dry environments d. Speckled alder; b White ash; c. Red oak; 12 Speckled alder (Ainus rugosa) 10 White ash Red oak Quercus rubra) -2 eat Leaf water potential (MP

Explanation / Answer

6. Option A is correct.

Genetic variation is a prerequisite for natural selection to occur.

7. Options C and D are correct.

The allocation of aboveground and belowground biomass by a plant shows both genetic variability and phenotypic plasticity. It is primarily dependent on the incident radiation.

8.  

A. Speckled alder shows the greatest potential amount of photosynthesis.

B. Red oak exhibits the broadest tolerance for water stress.

C. Red oak is a poorest competitor in the wet environment.

D. Red oak is the best competitor in the dry environment.

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