Lectures 4 and 5

Choose wisely:

• Reese's

• Doritos

• Oreos

• M&Ms

• Fruits

Through adaptations such as leaf thickness, size, e and shape, plants have acquired properties that allowed them colonize different environments. These adaptations extend even to their photosynthetic processes. Considering carbon fixation, two main types of plant photosynthesis have emerged: C3 plants and C4 plants. Which alternative better describes the changes provided by C4 plants photosynthesis?

• C4 photosynthesis prioritizes environments with higher concentrations of O2 and lower concentrations of water

• C3 photosynthesis in an adaptation towards environments that have less concentrations of atmospheric CO2 and possibly less water

• C4 photosynthesis in an adaptation towards environments that have less concentrations of atmospheric CO2 and possibly less water

• C3 photosynthesis prioritizes environments with higher concentrations of O2 and lower concentrations of water

Plant "A" is known for having leaves that are thin, have low toughness and high concentrations of nutrients

Plant "B" is known for having high leaf toughness with low nutrient concentration, a low growth rate and high defenses.

Which plant(s) shows adaptations towards LOW fertility soils?

• A

• B

• A and B

• Neither

Both for plants and animals, adaptations mean effectively dealing with two aspects of their environment. Which are these aspects?

• Food source and temperature avoidance

• Predation and temperature forecasting

• Finding a mate and dealing with environmental catastrophes

• Energy source and temperature regulation