3.1 Changes in human and parrot populations over 500 years. The table below shows food groups with waste costs. Instructions for farmers: 1. Ensure sufficient supply of food. 2. Restrict access to particular types of food. 3.2 The transport of food over long distances. 3.3 The packaging and processing of food. 3.4 Notes on food thrown away each year.

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3.1 Changes in human and parrot populations over 500 years - NSC Life Sciences - Question 3 - 2017 - Paper 1

Question 3

3.1 Changes in human and parrot populations over 500 years. The table below shows food groups with waste costs. Instructions for farmers: 1. Ensure sufficient supp... show full transcript

Worked Solution & Example Answer:3.1 Changes in human and parrot populations over 500 years - NSC Life Sciences - Question 3 - 2017 - Paper 1

Step 1

3.1.1 To allow time for the auxins from the tip

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Answer

The auxins must diffuse from the tip into the agar jelly. This diffusion requires time for effective interaction with the surrounding cells. Adequate time ensures that the growth responses are correctly stimulated.

Step 2

3.1.2 Auxins from the agar jelly

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Answer

When auxins diffuse into the coleoptile from the left side, the cells on that side are stimulated to elongate. The cells on the right side, however, do not receive the same level of auxins and consequently grow more slowly, causing bending towards the light.

Step 3

3.1.3 Remove the agar jelly completely

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Answer

To test the growth response accurately, the agar jelly should be removed completely or replaced with an agar jelly that does not contain auxins. Additionally, placing a black box around the tip of the coleoptile will prevent light from influencing growth.

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