Question 1(a)(ii)
[Maximum number: 2]
Sensitivity is one of the characteristics of life. The eye is one of the major sense organs of vertebrates.
Define the term sense organ.
IGCSE Biology Extended 14.2.1—Sense organs as groups of receptor Topic Practice
14.2.1—Sense organs as groups of receptor
• Describe sense organs as groups of receptor cells responding to specific stimuli: light, sound, touch, temperature and chemicals
Question 2(a)
[Maximum number: 2]
Define the term sense organ.
Question 3(e)
[Maximum number: 3]
Heroin is a drug that acts on the nervous system.
List three stimuli, other than pain, which humans can detect.
1
2
3
Question 3(b)
[Maximum number: 1]
State the names of two sense organs.
1
2
Question 4(b)(i)
[Maximum number: 1]
The responses of the human body to danger are coordinated by the nervous and endocrine systems.
Fig. 4.1 shows the sequence of events that occurs in response to a dangerous situation that is detected by the eyes.
Fig. 4.1
State the tissue in the eye that converts light energy into nerve impulses.