Question 5:
(a) Cell division is a process to produce a new cell. Diagram 5.1 shows a phase of cell division of cheek cell.
(i) State the type of cell division.
[1 mark]
(ii) State the phase in Diagram 5.1.
[1 mark]
(b) Diagram 5.2 shows the bar chart of production of guava fruits from a farm.
The farmer used cloned seedlings which are good quality and resistance to a type of disease but there is a decrease in fruit yield production.
Why did the situation occur?
[2 marks]
(c) A patient has been diagnosed with cancer. The doctor suggested to him to undergo a treatment using a technique in a genetic research application.
Explain the technique.
[2 marks]
Answer:
(a)(i) Mitosis
(a)(ii) Anaphase
(b)
– All guava trees produced through cloning have the same gene
– Therefore, a new disease will cause all trees to be infected
(c)
Application : Gene therapy
Explanation :
This technique is carried out by replacing the damaged gene by inserting a normal gene into the cells of the patient’s body
(a) Cell division is a process to produce a new cell. Diagram 5.1 shows a phase of cell division of cheek cell.
(i) State the type of cell division.[1 mark]
(ii) State the phase in Diagram 5.1.
[1 mark]
(b) Diagram 5.2 shows the bar chart of production of guava fruits from a farm.
The farmer used cloned seedlings which are good quality and resistance to a type of disease but there is a decrease in fruit yield production.Why did the situation occur?
[2 marks]
(c) A patient has been diagnosed with cancer. The doctor suggested to him to undergo a treatment using a technique in a genetic research application.
Explain the technique.
[2 marks]
Answer:
(a)(i) Mitosis
(a)(ii) Anaphase
(b)
– All guava trees produced through cloning have the same gene
– Therefore, a new disease will cause all trees to be infected
(c)
Application : Gene therapy
Explanation :
This technique is carried out by replacing the damaged gene by inserting a normal gene into the cells of the patient’s body
Question 6:
Diagram 6.1 shows an incomplete Modern Periodic Table of Elements.
(a) State the principle for the arrangement of the elements in the Modern Periodic Table of Elements.
[1 mark]
(b) Based on Diagram 6.1, state one element that is in the halogen group.
[1 mark]
(c) If the number of neutrons of atom L is 12 , what is the nucleon number of atom L?
[2 marks]
(d) Diagram 6.2 shows the penetrating power of rays X, Y and Z.
Based on Diagram 6.2, explain why ray Z can be used in treating cancer.
[2 marks]
Answer:
(a) In the order of increasing proton number from left to right and top to bottom
(b) Q
(c)
$$ \begin{aligned} \text { Nucleon number } & =\text { Proton number }+ \text { Neutron number } \\ & =11+12 \\ & =23 \end{aligned} $$
(d)
– Ray Z is gamma rays
– High penetrating power
Diagram 6.1 shows an incomplete Modern Periodic Table of Elements.
(a) State the principle for the arrangement of the elements in the Modern Periodic Table of Elements.[1 mark]
(b) Based on Diagram 6.1, state one element that is in the halogen group.
[1 mark]
(c) If the number of neutrons of atom L is 12 , what is the nucleon number of atom L?
[2 marks]
(d) Diagram 6.2 shows the penetrating power of rays X, Y and Z.
Based on Diagram 6.2, explain why ray Z can be used in treating cancer.
[2 marks]
Answer:
(a) In the order of increasing proton number from left to right and top to bottom
(b) Q
(c)
$$ \begin{aligned} \text { Nucleon number } & =\text { Proton number }+ \text { Neutron number } \\ & =11+12 \\ & =23 \end{aligned} $$
(d)
– Ray Z is gamma rays
– High penetrating power