Answer the following statements true (T) or false (F)
1. In the evolution of plants, wood appeared before seeds.
2. Ginkgo trees and humans have similar chromosomal sex-determination systems.
3. The fig tree Ficus tremula produces unique inflorescences that are only accessible to a particular species of pollinating fig wasp Courtella wardi. The inflorescence provides a protected space for the fig wasp to lay eggs which then develop into the next generation of adult fig wasps. This relationship between the fig tree and the fig wasp is an example of coevolution.
4. In the fall, squirrels often harvest large numbers of acorns and bury some of them for future consumption. Over the winter, however, many of these acorns are forgotten by the squirrels and germinate in the spring, producing the next generation of oak trees. This relationship between the squirrel and oak tree is an example of a coevolved seed dispersal mechanism.
1. TRUE
2. TRUE
3. TRUE
4. TRUE
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Answer the following statements true (T) or false (F)
1. Scientists developing drought tolerant plants can use the knowledge of relative water content as models for predicting how these plants will respond to stress. 2. If scientists want to develop plants that can withstand cold conditions they would breed for the ability of the plant to increase solutes in cells. 3. One possible explanation for the reason water can be transported up the vessels in plants is because of adhesion of water to the lignified walls. 4. Given the same driving force, water transport in vessels is more rapid than that in tracheids because of the end wall perforation of vessels. 5. Liquids move faster in plant cells by bulk flow than by diffusion.
At the start of both experiments, the bacteria were
a. evenly distributed throughout the chamber. b. clustered on the algal filament. c. clumped along certain areas of the algal filament. d. actively avoiding the algal filament.
In which stage of labor dose the amniotic sac rupture?
a. the first stage only b. the second stage only c. the third stage only d. in either the first or second stage e. in either the second or third stage
Which of the following is not a function of the excretory system?
What will be an ideal response?