Question 1
Explain the meaning of the following branches of biology
a) Cytology
b) Mycology
Answer
a) Cytology - Study of cells
b) Mycology - Study of fungi
b) Mycology - Study of fungi
Question 2
State three reasons why it’s necessary to classify living organisms.
Answer
1. Helps to develop scientific skills like observation, recording e.t.c.
2. Helps to arrange information in orderly manner to avoid confusion
3. Helps to understand evolutionary or phylogemetic relationship
2. Helps to arrange information in orderly manner to avoid confusion
3. Helps to understand evolutionary or phylogemetic relationship
Question 3
The diagram below represents a neuron.
a) Identify the neuron
b) Give a reason.
c) Identify the parts labeled A and D.
A
D
d) State the function of neuron.
Answer
a) Sensory neuron / Afferent neuron
b) - Cell body of the axon
- Short axon
- No dendrites on the cell body
c) Identify the parts labeled A and D.
A - Schwann cells
D - Node of ranvier
d) Transmits impulse from receptors / sense organs to central nervous system / brain/ spinal cord.
b) - Cell body of the axon
- Short axon
- No dendrites on the cell body
c) Identify the parts labeled A and D.
A - Schwann cells
D - Node of ranvier
d) Transmits impulse from receptors / sense organs to central nervous system / brain/ spinal cord.
Question 4
A form one student trying to determine the size of onion cells observed the following on a microscopes field of view.
If the student observed 2 cells across the field of view calculate the length of one cell in micrometers.
Answer
Diameter of field of view = 3 mm = 3000 μm
No of cells = 20 cells
No of cells = 20 cells
Question 5
The diagram below represents a certain organism collected by a student on his way to school
a) State the class to which the organism belongs
b) Give two reasons for your answer (a) above
Answer
a) Arachnida
b) 1. Four pairs of legs
2. Lack antennae
b) 1. Four pairs of legs
2. Lack antennae