CSEE
Biology · Paper 2A · 2023
2 questions 🇹🇿 NECTA ✓ Official NECTA answers
CSEE
🇹🇿 NECTA
✓ Official NECTA answers
Biology · Paper 2A · 2023
2 questions
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Questions (2)
Section A
1.
0 marks
You have been provided with specimens J, X, Y and Z. Observe the specimens carefully. then answer the following questions:
(a)
(i) Draw a well labeled diagram of specimen X with locomotary structures.
(ii) Why specimen X must have locomotary structures? Give four reasons.
(iii) Use a knife to cut and totally remove the scales and fine r s e t f u ro rn m ed to its habitat alive. if the specimen is impaired, sketch the skeleton and explain seven activities that will be performed to get it back to its habitat alive.
0 mk
(a(i))
Draw a well labeled diagram of specimen X with locomotary structures.
3 mk
(a)
Set up the apparatus as shown in Diagram 1. Record your initial readings.
5 mk
(b)
(i) Study specimen Y andJ and give their common names and the part of the skeleton from which each specimen were taken.
(ii) Briefly explain the function performed by specimen Y in the human body.
(iii) Explain four adaptive features of specimen Y which help it to perform its function to the human body.
0 mk
(a(ii))
Why specimen X must have locomotary structures? Give four reasons.
4 mk
(b)
Carry out the experiment for 15 minutes, taking readings at 3-minute intervals. Record your results in a table.
10 mk
(c)
Plot a graph of your results. Label the axes and title the graph.
5 mk
(a(iii)
Use a knife to cut and totally remove the scales and fine structures from specimen X and explain four activities that will be impaired, if the specimen is intact.
4 mk
(c)
(i) Carefully observe the structure of specimen J and identify the type of joint(s) that would be formed to the bodyo f the animal.
(ii) Explain how the specimen J is adapted for formation of the joint(s) identified in (i).
0 mk
(b(i))
Study specimen Y and J and give their common names and the part of the skeleton from which each specimen were taken.
2 mk
(d)
Closely observe specimen Z and explain three characteristic features which help it to move in its habitat easily.
0 mk
(b(ii))
Briefly explain the function performed by specimen Y in the human body.
1 mk
(b(iii)
Explain four adaptive features of specimen Y which help it to its function to the human body.
4 mk
(c(1))
Carefully observe the structure of specimen J and identify the type of joint(s) that would be formed to the body of the animal.
1 mk
(c(2))
Explain how the specimen J is adapted for formation of the joint(s) identified in (1).
2 mk
(d)
Closely observe specimen Z and explain three characteristic features which help it to move in its habitat easily.
3 mk
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2.
0 marks
Carefully study the specimens G, H and K and answer the following questions:
(a)
Identify specimen A and list three of its distinguishing features.
5 mk
(a)
(i) Identify one feature which may influence the artificial classification system to place both specimens K and H into the same taxonomic group.
(ii) What is suggested by scientists on noticing that specimens K and H consist of structures and characteristics common to that of the two to us of a classification system for microorganisms? Give specific reasons.
0 mk
(a(i))
Identify one feature which may influence the artificial classification system to place both specimens K and H into the same taxonomic group.
1 mk
(a(ii))
Why is specimen K and H not in the same taxonomic group of 'insects' under artificial classification system for given reasons.
2 mk
(b)
(i) Classify each of the specimens G, H and K to Class level.
(ii) Account for the features used in the natural classification system to place specimens G and H to their Classes.
(iii) Name four organisms which share the same Phylum with the specimen K.
(iv) In what ways members that were placed together with specimen K in the same Class are advantageous in our daily life?
0 mk
(b)
Describe the structure of specimen B, highlighting its adaptation to its environment.
10 mk
(c)
(i) Draw ad iagram of specimen H and label external features
(ii) Jdentify two observable features of specimen H at the Kingdom level
0 mk
(c)
Explain the function of part X in specimen C.
5 mk
(d)
Classify specimen D up to the level of Phylum/Division.
5 mk
(b(i))
Name four organisms which share the same Phylum with the specimen K.
4 mk
(b(ii))
In what ways members that were placed together with specimen K in the same Class are advantageous in our daily life?
3 mk
(c(i))
Draw a diagram of specimen H and label external features
2 mk
(c(ii))
Identify two observable features of specimen H at the Kingdom level
2 mk
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