Assessment Direction: Choose the letter of the best answer and write it on your own answer sheet. 1. A substance in the air that is given off by trees and is beneficial to human beings. A carbon dioxide C. carbon monoxide B. erosion D oxygen 2. Processed wood from planted trees that is used to construct houses for man and animals A lumber paper B. pulp D. rubber 3. These are erect plants with single woody stem and it plays a very important role in our ecological balance. A. flower C. shrub B. tree D. vine 4. The following are benefits in planting trees and fruit-bearing trees except one. A. They serve as valuable wildlife habitat. B. Trees cause erosion. C. They prevent lake and river sedimentation. D. They provide shade and fresh air around the house and along the streets and surroundings. 5. Chemical taken in by trees from factories and motorized vehicle emissions. Acarbon dioxide C. oxygen B. soil erosion D. sulfur dioxide​