Figure 9 shows a photomicrograph of two stomata in a leaf - Edexcel - GCSE Biology Combined Science - Question 6 - 2023 - Paper 2
Question 6
Figure 9 shows a photomicrograph of two stomata in a leaf.
(a) (i) The length of one guard cell in this image is 6mm.
Convert the length of this guard cell into mic... show full transcript
Worked Solution & Example Answer:Figure 9 shows a photomicrograph of two stomata in a leaf - Edexcel - GCSE Biology Combined Science - Question 6 - 2023 - Paper 2
Step 1
Convert the length of this guard cell into micrometres (µm)
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To convert millimetres to micrometres, multiply by 1000. Therefore:
6extmm=6imes1000=6000extµm
Step 2
Calculate the actual size of the guard cell
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To find the actual size of the guard cell, divide the measured length by the magnification factor:
Explain the role of denitrifying bacteria in the nitrogen cycle
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Denitrifying bacteria play a crucial role in the nitrogen cycle by converting nitrates (NO3-) in the soil back into nitrogen gas (N2), which is released into the atmosphere. This process helps to reduce the excess nitrates that could lead to soil and water pollution, thereby maintaining ecological balance.
