CIE Biology Paper-4: Specimen Questions 89 - 91 of 120

Passage

Diagram shows a chart

the production of two different cells by a pollen mother cell

the production of two different cells by a pollen mother cell

Figure shows the production of two different cells by a pollen mother cell, Label the part B and C

Question number: 89 (1 of 2 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

Complete the given chart

Explanation

 production of two different cells by a pollen mother cell

production of two different cells by a pollen mother cell

Figure shows the production of two different cells Vegetative cells and generative cells by a pollen mother cell

Question number: 90 (2 of 2 Based on Passage) Show Passage

Short Answer Question▾

Write in Short

What is the difference between part A and B.

Explanation

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

Essay Question▾

Describe in Detail

Diagram shows a process done by plant leaves. Which process is it? What factors affect such process?

Image shows a process occur in plants

Image shows a process occur in plants

Image shows a process occur in plants, identify it

Explanation

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.

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