Required Practical 8: Plant Responses PAPER 2

Question 1

In the required practical plant responses what do you investigate.

Answer 1

The effect of light or gravity on the growth of newly germinated seedlings.

Question 2

When investigating the effect of light intensity on the height of seedlings, the independent variable is the …

Answer 2

light intensity.

Question 3

When investigating the effect of light intensity on the height of seedlings, the dependent variable is the …

Answer 3

height of the seedlings

Question 4

First, we place cotton wool in —— and then soak them with equal volumes of water.

Answer 4

three petri dishes

Question 5

First, we place cotton wool in three petri dishes and then soak them with …

Answer 5

equal volumes of water.

Question 6

The volume of water is a ——— variable.

Answer 6

control

Question 7

Secondly, place ————— in each dish.

Answer 7

10 mustard seeds

Question 8

The type of seeds is a —— variable.

Answer 8

control

Question 9

Thirdly, we leave the dishes in a —– place and allow seeds to germinate.

Answer 9

warm

Question 10

Thirdly, we leave the dishes in a warm place and allow seeds to …

Answer 10

germinate.

Question 11

After a few days the seeds will …

Answer 11

germinate

Question 12

Fourthly, make sure that the three dishes have the same amount of …

Answer 12

seedlings

Question 13

The number of seedlings is a ——- variable.

Answer 13

control

Question 14

Fifthly, remove excess seedlings so that …

Answer 14

all three dishes have the same amount of seedlings in each.

Question 15

Sixthly, use a ruler and —-, holding the stems to make sure that they are straight.

Answer 15

measure the height of each seedling

Question 16

Sixthly, use a ruler and measure the height of each seedling, holding the …

Answer 16

stems to make sure that they are straight.

Question 17

Seventhly, place each of the three petri dishes in …

Answer 17

different conditions.

Question 18

One of each dish is place in a area of …

Answer 18

full sunlight, partial light, complete darkness

Question 19

Eighthly, measure the height of …

Answer 19

every seedling over 5 consecutive days.

Question 19

Using this data draw a …

Answer 19

diagram displaying the effects of different light intensities.

Question 19

Eighthly, measure the height of every seedling over 5 consecutive days. Using this calculate the …

Answer 19

mean height

Question 20

the height of the seedlings is ——– for both full sunlight and partial light.

Answer 20

similiar

Question 21

The seedlings in complete darkness are small and yellow because …

Answer 21

once the seedlings have used all their energy stores they cannot carry out photosynthesis in the dark.

Question 22

The seedlings in complete darkness are ————- because once the seedlings have used all their energy stores they cannot carry out photosynthesis in the dark.

Answer 22

small and yellow

Question 23

When investigating the effects of gravity on seedlings, …

Answer 23

put the dish is placed on its side in different conditions (full sunlight, partial and darkness)