Topic K: Coordination and response

Question 1

What is the Cornea?

Answer 1

transparent layer responsible for most of the refraction (bending) of light rays that enter the eye.

Question 2

What is the Aqueous humor?

Answer 2

This is a watery fluid which supports the cornea and the front chamber of the eye.

Question 3

What is the Vitreous humor?

Answer 3

a jelly like substance which helps to keep the shape of the eyeball, supports the lens and keeps the retina in place at the back of the eye.

Question 4

What is the Blind spot?

Answer 4

at the exit point of the optic nerve. There are no light sensitive cells here so light falling on this region cannot be detected.

Question 5

What is the Optic nerve?

Answer 5

composed of sensory neurons which carry impulses to the visual centre at the rear of the brain.

Question 6

What is the Yellow spot (fovea)?

Answer 6

this area has the highest density of cones and thus offers maximum sharpness but only works at full efficiency in bright light.

Question 7

What is the Retina?

Answer 7

contains the light-sensitive cells, the rods and cones.

Question 8

What is the Choroid?

Answer 8

a darkly colored layer which reduces reflections inside the eye and contains blood vessels which help to nourish the cells of the retina.

Question 9

What is the Sclera?

Answer 9

the tough outer coat which protects the eye against damage. The muscles that move the eye in its socket attach to the Sclera.

Question 10

What is the Pupil?

Answer 10

The circular opening which lets light into the eye. It appears black because the choroid is visible through it.

Question 11

What is the Iris?

Answer 11

The colored part of the eye which can expand and contract to control the amount of light that enters the eye.

Question 12

Where is the Pupil?

Answer 12

The circular opeing that lets light into the eye

Question 13

Where is the Iris?

Answer 13

The coloured part of the eye around the pupil

Question 14

Where is the Aqueous Humour?

Answer 14

supports the cornea and the frount of the eye.

Question 15

Where is the Vitreous humour?

Answer 15

What most of the eye is made of, keep shae of the eye ball.

Question 16

Where is the blind spot?

Answer 16

At the top of the optic nerve.

Question 17

Where is the Optic nerve?

Answer 17

the nerve that goes out the back of the eye.

Question 18

Where is the Yellow spot (fovea)

Answer 18

Highest density of cones, indent right at the back of the eye.

Question 19

Where is the retina?

Answer 19

Area at the back of the eye, contains the light sensitive cells.

Question 20

Where is the Choroid?

Answer 20

The darkly coloured layer all around the eye ball.

Question 21

Where is the Sclera?

Answer 21

the tough outer coat of the eye ball.

Question 22

Where is the lens?

Answer 22

the focusing part at the frount of the eye.

Question 23

Where is the Ciliary muscle?

Answer 23

the bits that hold the suspensory ligament to the eye ball.

Question 24

Where is the Suspensory ligament?

Answer 24

The bit that holds the lens to the eye ball.

Question 25

What is Auxin?

Answer 25

Auxin is a plant growth hormone

Question 26

What does Auxin do?

Answer 26

Auxin causes shoots to grow towards light and grow against gravity.

Question 27

What does Auxin do in plant roots?

Answer 27

Auxin inhibits growth in plants roots, Auxin casuses roots to grow with gravity and towards moisture.

Question 28

What is geotropism?

Answer 28

Roots grow with gravity (positive geotropism) and stem grows against gravity (negative geotropism)

Question 29

What is phototropism?

Answer 29

Shoots grow towards light (positive phototropism) to maximise photosynthesis.

Question 30

What are the two things that a organisms need to respond to the chnages in there enviromant?

Answer 30

A receptor and a effector.

Question 31

On roots, how does Auxin work?

Answer 31

Auxin acculmilates on the side with least moisture. This causes the root to grow towards the moisture.

Question 32

In the shoots, how does Auxin work?

Answer 32

Auxin accumelates on the dark side, casueing growth on that side therefore it bends towards the light.

Question 33

In the shoots, how does Auxin work with gravity?

Answer 33

Auxin acculelates on the bottom side casueing the shoot to grow up.

Question 34

In the roots, how does Auxin effect the gravity?

Answer 34

Auxin accumulates on the bottom side; this inhibits growth and the roots grow downwards, becasue the tops of the roots are growing more quickley.

Question 35

What is homeostasis?

Answer 35

Homostasis is the maintenece of a constant interval enviromant and that examples of it include body water content and body temperature.

Question 36

In what ways do plants respond to stimuli?

Answer 36

the plant will grow toward sthe light, phototropism to aid photosyntghesis. Also plants will grow towards gravity and towards moisture.

Question 37

What does the central nervous syestem consist of?

Answer 37

The brain, spibnal cord and is linked to sense organs by nerves.

Question 38

What happens when the Reflex arc is used?

Answer 38

1) Pin produces painful stimulas in receptor
2) message is fired down as an impulse along the sensory neorone to spinal cord.
3) Sonsory neurones is found in the dorsal root of the spianal nerve.
4) Message passes by diffusion of chemicals across the syncpse. This causes an impulse to pass to the conecter neurone.
5) The impulses travels aong the connector neorone until it reaches the next synapse. here a chemical transmitter passes accross to the motor neurone.
6) Moter (effector) neurone carries impulses to the effector (muscle)

Question 39

What is the eye?

Answer 39

the eye is a sence organ, containing different tissues working together to perform a function.