Fluctuation of population in fresh water lake ecosystem is shown in the diagram.
State an example of a producer and a primary consumer.
Biology_2013_STPM Term 3_Structure
Quiz
•
Biology
•
12th Grade
•
Easy
Loh Jane
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Fluctuation of population in fresh water lake ecosystem is shown in the diagram.
State an example of a producer and a primary consumer.
A
B
C
D
Answer explanation
Producer :
Water weeds Elodea
Primary consumer: Herbivorous fish
Example: carp
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
State the relationship between the population of a producer and a primary consumer. ( 1 mark)
A
B
C
D
Answer explanation
Positively correlated. The population of a primary consumer as the producer increases and vice versa.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Explain why the population decreases significantly by May and June despite the favorable condition of light and temperature. ( 2 marks )
A
B
C
D
Answer explanation
This is due to the decrease in nutrients. With lesser nutrients, the population of the producer cannot grow.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
State the most likely source of the increase in nutrient that begins in October until November.
( 1 mark )
A
B
C
D
Answer explanation
Release of nutrients when the producer and primary consumer die and decompose.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
State two factors that would influence the fluctuation of the population. (2 marks)
A
B
C
D
Answer explanation
Competition, predation.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The process of DNA replication at one of the replication fork is shown in Diagram 1, while part of the steps involved in the synthesis of one of the new DNA strands shown in Diagram 2.
Name the strands P and Q.
A
B
C
D
Answer explanation
P : Lagging strand
Q : Leading strand
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Name the structure S.
A
B
C
D
Answer explanation
Okazaki fragment.
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Name the enzymes and the processes that are involved in Steps Ⅰ and Ⅱ.
A
B
C
D
Answer explanation
Step Ⅰ :
Enzyme : DNA Polymerase
Process : Line up nucleotides and form phosphodiester bonds.
Step Ⅱ :
Enzyme : Ligase
Process : To join Okazaki fragments and form longer DNA stands.
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