CIE Biology Paper-4: Specimen Questions 89 - 91 of 120
Diagram shows a chart
Question number: 89 (1 of 2 Based on Passage) Show Passage
Write in Short
Complete the given chart
Question number: 90 (2 of 2 Based on Passage) Show Passage
Write in Short
What is the difference between part A and B.
Cell A is bigger in size and it has abundant food reserve. It has a larger irregularly shaped nucleus. Cell B is small and it floats in cytoplasm of vegetative cell.
Question number: 91
Describe in Detail
Diagram shows a process done by plant leaves. Which process is it? What factors affect such process?
Diagram shows transpiration process in which moisture is carried by plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.
Factors affecting transpiration- There are a number of factors that affect transpiration rates:
1- Temperature- Transpiration rates increase as the temperature goes up, especially during the growing season, when the air is warmer due to stronger sunlight and warmer air masses
2- Relative humidity- As the relative humidity of the air surrounding the plant enhance the transpiration rate decrease.
3- Wind and air movement- Increased circulation of the air near plant will result in increased level of transpiration rate
4- Soil-moisture availability- When moisture is lacking, plants can begin to premature ageing, which can result in leaf loss and transpire less water
5- Type of plant-Plants transpire water at different rates. Some plants which grow in dry areas, such as cactus, save water by transpiring less water than other plants.