TPO51-L1
Maize and Teosinte
Listen to part of a lecture in a botany class.
- What is the lecture mainly about?
- A. A research study that compares wild and domesticated plants
- B. Problems with a commonly held hypothesis about the origin of teosinte
- C. Reasons why wild plants are usually unsuitable for agriculture
- D. The process used to identify the ancestor of a modern crop
- What evidence seemed to indicate that maize and teosinte are not related?
- A. Young teosinte plants do not physically resemble young maize plants.
- B. Preliminary DNA evidence indicated that teosinte was related to rice.
- C. Maize and teosinte usually grow in significantly different climates.
- D. Maize and teosinte have very different types of kernels.
- Why does the professor discuss hybrids?
- A. To explain how a geneticist confirmed that maize was widely grown 9,000 years ago
- B. To indicate the earliest method used by geneticists to identify plant origins
- C. To explain a method used to demonstrate a link between two plant species
- D. To describe how geneticists distinguish between wild plants and domesticated plants
- What was most researchers’ initial view of George Beadle’s theory about teosinte?
- A. They accepted it but questioned the evidence cited.
- B. They rejected it because of conflicting archaeological evidence.
- C. They questioned it because it implies that ancient farmers were sophisticated plant breeders.
- D. They questioned it because genetic research was viewed with skepticism at that time.
- What did Beadle conclude about maize and teosinte?
- A. Both plants lack particular genes that are common in most domesticated plants.
- B. Both plants have particular genes that enable them to adapt to varying climates.
- C. Only a small number of genes are responsible for the differences between the two plants.
- D. The genetic composition of both plants is very similar to that of rice.
- According to the professor, why was the discovery of stone tools important?
- A. It proved that teosinte was simultaneously domesticated in multiple locations.
- B. It helped to confirm the period in which maize was first domesticated.
- C. It suggested that maize required farming techniques that were more complex than experts had previously assumed.
- D. It provided evidence that maize plants were used for more purposes than experts had previously assumed.
答案：
D D C C C B