mock exam Flashcards
define the term food chain
a food chain is a sequence showing how energy is transferred from one organism to another through feeding.
explain what happens to energy when its moves up the food chain
the energy decreases as you move up the food chain because it is lost due to movement, respiration and heat
what is the function of the iris?
the iris controls the size of the pupil and the amount of light entering the eye
name one male and female reproductive organ
testicle and ovaries
name two structures found in the plant cell and not the animal cell
the cell wall and chloroplasts
what does HIV stand for
HIV stands for “human immunodeficiency virus”
Name two chemical birth controls
The pill and spermicide
Name two surgical birth control methods
tubal ligation and vasectomy
Name two barrier birth control methods
condoms and diaphragm
name one part a woman where fertilization occurs
fallopian tube
explain what happens in fertilization
fertilization occurs when a sperm cell meets and fuses with a egg cell , usually in the fallopian tube ,forming a zygote
state the function of the retina
the retina detects light and converts it into nerve impulses
explain how the pupil reacts when A person walks from a dark room into bright sunlight
in bright light, the pupil constricts to reduce the amount of light entering the eye to protect the retina
how is HIV transmitted?
it is transmitted by engaging in unprotected sex and sharing needles
what type of blood cell does HIV attack
White Blood cells
what method of birth control can also protect against HIV
a condom can also protect against HIV
In the reflex arc, what type of neuron carries impulses from the sense organ to the spinal cord
sensory neuron
What is the CNS
CNS is the central nervous system
whats makes up the CNS
the brain and spinal cord
define the term stimulus
a change in the internal or external environment of an organism that initiates a response
define the term response
a change in an organism or part of an organism which is brought about by a stimulus
explain the response that milipides may have to the stimuli found in a basement
- moisture– because millipedes are positively hydrotactic, meaning they move towards moist areas. basements are often moist which prevents the from drying out since they lose water easily.
2.Darkness- They are negatively phototactic, meaning they move away from light. basements are dark, which protect them from predators and drying out
define the term gene
a unit of heredity transferred from a parent to offspring and is held to determine some of its characteristic
define the term pollination
the transfer of pollen grains from the anther to the stigma of flowers
