B3d Divide & Rule Questions

B3d Divide & Rule Questions paper

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  • Created on: 02-05-12 09:07
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B3d Divide and Rule
1. Structure of a sperm cell is adapted to its function:
small s................ and t................
n................ carries genes
produced in large numbers to increase chance of f................ .
Structure of an egg cell is adapted to its function:
large size as contains f................ source (for the growing embryo)
n................ carries genes.
1. The differences between a sperm cell and an egg cell are:
The sperm cell has a tail so that it can s................ to egg
It is also ................ in size compared to the egg so that can produce in ................
numbers and it would be easy to s................ .
The egg cell is much larger than the sperm cell as it ................ food.
2. Describe the growth of an embryo, with cell division ideas: After fertilization an egg
cell develops into an embryo. Cells ................ so the embryo grows bigger in size.
Cells also d................ produce many different types of s................ cells to make
the new organism.
3. Lots of sperm cells are produced at the same time. Explain why?
.........................................................................................................
.........................................................................................................
..............................
4. kangaroos have 12 chromosome in the skin cell. How many chromosomes are in
a sperm cell from a kangaroo?...............
Higher only:
5. This question is about human growth.
(a) The diagram shows a sperm cell.
(i) Sperm cells are adapted to fertilise egg cells.
Explain how the acrosome is an adaptation for fertilisation.
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Some sperm cells have more mitochondria than others.
Would you expect sperm cells with more mitochondria than
others to have a greater chance of fertilising an egg? Explain
your answer.
Would they have a greater chance of fertilising an egg? _
Explanation _
_
(b) The diagram shows a fertilised egg cell dividing.
What type of cell division does the diagram show?
..............................
(c) The graph shows how the mass of a boy changes as he grows.…read more

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Continue the line to show how a boy's mass changes between the ages of 10 and 20
years.
6. On this same axes above show how the master of the treaty would change over the
years if it hadn't been trimmed and if the growing conditions have been good.
7. Where in the tree cell division mainly
happen?...........................................................................
8. This question is about cells.
(a) (i) Kangaroos have 12 chromosomes in each skin cell.…read more

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Which diagram describes meiosis?
Choose A, B, C or D.
......................................................................................................................................
(ii) Which diagram describes mitosis?
Choose A, B, C or D.
...................................................................................................................................................
.
9. describe how new cauliflower plants can be grown by tissue culture:
a. choose suitable cauliflower with a d................ characteristics
b. Cut out very s................ pieces from this
c. Take many pieces and s................ these ( put these in disinfectant)
d. The surrounding place must be very clean, s................ with disinfectant.
e. Place these pieces of cauliflower carefully into a................…read more

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