CSEC Biology Paper 3 May/June 2014 - Free CXC Past Paper with Answers

The apparatus in Figure 2 is set up to investigate one of the conditions necessary for the germination of tomato seeds.

Figure 2. Investigating the germination of tomato seeds

Write a suitable aim for this investigation.

Suggest TWO precautions which need to be taken to ensure that the results of this investigation are valid.

Explain the importance of moisture in the cotton wool.

Describe how the investigation could be modified to determine if oxygen is necessary for germination.

Some seeds that were planted deeply in the soil germinated but did not come up above ground. Suggest why this happened.

Figure 3 shows drawings of six germinated tomato seedlings collected at different times after the experiment was set up. The magnification of each drawing is $\times 3$.

Figure 3. Germinating tomato seedlings

Measure the length of the radicle of EACH of the tomato seedlings in Figure 3 and record your answer in a suitable table in the space provided below.

Not all plants produce seeds. Some plants reproduce by their leaves, such as the one shown in Figure 4.

Figure 4. Drawing of leaves of a plant

Name the type of reproduction carried out by this plant.

Suggest TWO advantages of this type of reproduction compared to the production of seeds for reproduction.