1 Figure 1 shows a cell from an onion root tip - Edexcel - GCSE Biology Combined Science - Question 1 - 2021 - Paper 1
Question 1
1 Figure 1 shows a cell from an onion root tip.
This cell is dividing by mitosis.
(a) (i) Which structure is labelled Z?
a) allele
b) chromosome
c) spindle
d) nuc... show full transcript
Worked Solution & Example Answer:1 Figure 1 shows a cell from an onion root tip - Edexcel - GCSE Biology Combined Science - Question 1 - 2021 - Paper 1
Step 1
Which structure is labelled Z?
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
The structure labelled Z is D) nuclear membrane. This structure is important in protecting the genetic material within the cell during the process of mitosis.
Step 2
Mitosis produces new cells. Give two reasons why mitosis is important in living things.
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
Mitosis facilitates growth by allowing organisms to increase in size through the production of new cells.
It also aids in the repair and replacement of damaged or dead cells, ensuring the maintenance of healthy tissue.
Step 3
Draw one straight line from each stage of the cell cycle to its description.
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
Interphase → DNA is copied
Prophase → a spindle is formed
Metaphase → the nuclear membrane breaks down
Anaphase → the cell divides in two
Cytokinesis → two nuclei are formed
Step 4
State what can be added to the slide to make the plant cells more visible.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To make the plant cells more visible, a stain can be added to the slide, which enhances the contrast of the cell structures.
Step 5
Which is the total magnification of this microscope?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The total magnification of this microscope is D) x400. This is calculated by multiplying the eyepiece magnification (x10) by the objective magnification (x40).
Step 6
Name one part of a light microscope that can be moved to obtain a clear image of plant cells.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One part of a light microscope that can be moved to obtain a clear image is the stage, which can be adjusted to focus the slide containing the plant cells.
