BIOLOGY CLASS TEST 2 MEMO

1. LS3BFET/LSFT0B3 CLASS TEST 2 2017
1 | P a g e
LIFE SCIENCE 3B FET
CLASS TEST 2 – 2017 – Total: 95
SURNAME: _____________MEMO___________________________ STUDENT NR. __________
QUESTION 1 [10]
Choosethealternativethatbest answersthequestion orcompletes thestatement.Only encircle the correct letter.
1.1 The part of the tongue whichactsas a taste receptor,isthe _______
A) papilla.
B) olfactorycell.
C) proprioceptors.
D) buds.
E) otoliths
1.2 The foveaor yellowspotinthe eye ispartof the ________
A) choroid.
B) retina.
C) sclera.
D) conjunctiva.
E) Hypothalamus
1.3 Whichone (1) of the followingmechanoreceptorsare sensitivetochangesintexture andslow vibrations?

2. LS3BFET/LSFT0B3 CLASS TEST 2 2017
2 | P a g e
A. B. C.
C. D.
1.4 Whichof the followingisperceivedasumami?
A) the smoothandlushtaste of cheesecake
B) a rich chocolate taste
C) a savory complexcheese
D) spoiledmilk
E) saltwater
1.5 Whichof the followingstatementsaboutthe eye iscorrect?
1. The cornea bendslightrays.
2. The retinacontainsbloodvessels.
3. The ciliarymuscleschange the pupil diameter.
4. The conesrespondto brightlight.
A) 1, 2 and 3.
B.) 1, 2 and4.
C) 2, 3 and 4.
D) Only2 and 4.
E) Only 1 and 4

3. LS3BFET/LSFT0B3 CLASS TEST 2 2017
3 | P a g e
1.6 Whichof the followingisacorrect statementaboutthe cellsof the humanretina?
A) Cone cellscan detectcolour, but rod cellscannot.
B) Cone cellsare more sensitivetolightthanrodcellsare.
C) Cone cells,butnotrod cells,have avisual pigment.
D) Rod cellsare mosthighlyconcentratedinthe centre of the retina.
E) Rod cellsrequire higherilluminationforstimulationthandocone cells.
1.7 Whichof the followingstructuresisthe lastone thatsensoryinformationwouldencounterduringvisual
processing?
A) Ganglioncells
B) Bipolarcells
C) Primary visual cortex
D) Opticchiasma
E) Lateral geniculate nuclei
1.8 Identifythe name of the receptorcell inthe diagrambelow.
A) Meissner'scorpuscle
B) Paciniancorpuscle
C) Merkel'sdisc
D) End bulbsof Krause
E) Ruffini'sendorgan
1.9 Why doesyourarm feel coldwhen youreachinside the refrigeratortogeta containerof milk?
A) Circulatinglevelsof prostaglandinsincrease.
B) The temperature of the bloodcirculatingtothe arm decreases.

4. LS3BFET/LSFT0B3 CLASS TEST 2 2017
4 | P a g e
C) Thermoreceptorssendsignalstothe cerebral cortex where the change fromroomtemperatureto
refrigeratortemperatureistransduced.
D) Thermoreceptorsinthe skinundergoaccommodation,whichincreasestheirsensitivity.
E) Thermoreceptorssendsignals to the posteriorhypothalamus.
1.10 Whichof the followingsensorycutaneous mechanoreceptorsinthe skinwill be stimulatedinAlaska
especiallyinthe wintermonths?
A) End bulbsof Krause
B) Paciniancorpuscle
C) Ruffini'sendorgan
D) Meissner'scorpuscle
E) Free nerve endings
QUESTION 2 [9]
Give the correct biological TERM foreach of the following terms.
2.1 The papillae foundatthe back of the tongue. Circumvallate-
2.2 The mechanoreceptorsensitive tosustainedtouchandpressure. Merkel'sdisc
2.3 The pigmentedpartof the human eye,whichabsorbsstraylight. Choroid
2.4 Visual pigmentfoundinrods. Rhodopsin
2.5 Painreceptors,whichrespondtoexcessheat,pressure,orchemicals,releasedfromdamagedorinflamed
tissues. Nociceptors
2.6 The white part of the eye. Sclera
2.7 The structuresfoundon the frontand sidesof the humantongue. Fungiformpapillae
2.8 Visual disorder,whichcanbe correctedby wearingglasseswithanunevenlyroundlenstocompensate for
an unevencornea. Astigmatism
2.9 The part of the human eye thatregulatesthe size of the pupil. Iris

5. LS3BFET/LSFT0B3 CLASS TEST 2 2017
5 | P a g e
QUESTION 3 [76]
3.1 Give the biological namesfornearsightednessandfarsightednessanddistinguishbetween temintable
form. (10)
3.2 Discussthe followingterminologies:
3.2.1 Blindspot (5)
The part ofthe retina ofthe human eye whichcontainno cones and rods, the point where the
nervesand blood vesselsleave the eye andnoimage will be seenifthe light fallson this point,
3.2.2 Meissner'scorpuscle (4)
Receptor cellswhichget stimulatedby changes intexture,slowvibrations –light touch –lips,finger
tips
3.2.3 Thermoreceptors (4)
Receptorsfound in the skin and visceral organs whichrespondto heat or cold, helpregulate body
temperature bysignallingbothsurface and body core temperature.
3.2.4 Foveacentralis: (4)
The centre point on the retina ofthe human eye,where onlycones are found,enablingyouto see
the clearestimage ifthe light rays fallson this point of the retina
4.2.2 Choroid (4)

6. LS3BFET/LSFT0B3 CLASS TEST 2 2017
6 | P a g e
Pigmented2nd layer.ofthe eye.Absorbstray light. Containbloodvessels fornutritionandoxygen.
3.3 Studythe diagrambelowandanswerthe questionsthatfollow.
3.3.1 Where on the humanbodywill you findthe above structure? (1)
Tongue
3.3.2 Identifystructure inthe diagramabove. (1)
Fungiformpapillae
3.3.3 Identifystructure 1. (1)
Taste bud
3.3.4 Draw and label structure 1 indetail. (7)
Taste bud (Headingmust be written underneath to get Mark)
3.4 Name the two (2) photoreceptorsfoundinthe humaneye anddistinguishbetweenthem. (8)
o Rods
o and cones
o Rods are sensitive to lightand are therefore suitedfor night vision(blackand white)
o and peripheral vision.
o Conesare activated by bright light and allow us to
o detectfine detail and colour.
o Conescontain 3 pigments –B (blue),G (green) andR (red)
o End bulbs ofKrause – cold – all over body

7. LS3BFET/LSFT0B3 CLASS TEST 2 2017
7 | P a g e
3.5 Is the eye inthe diagramlookingata nearor far object?Give a reasonfor youranswer.
(2)
o Far –
o lensis lessconvex
3.6 Discussaccommodationindetail byreferringtothe diagramsbelow. (9)
o Accommodation isthe abilityof the lensto change shape to enable the eye to focuson near and
far objects
o A shows the shape of the lenslookingat a far object(more than 6 meters)
o During this processthe Ciliarymuscle relax
o Suspensoryligamentspull tight - There is more tensionon the lensand the
o Lens becomesflat(lessconvex)
o B showsthe shape of the lensof a person lookingat a near object. (lessthan 6 meters)
o During this processthe Ciliarymuscle contracts
o Suspensoryligamentsrelax - Lesstensionon the lens
o Lens becomesmore convex(rounded)

8. LS3BFET/LSFT0B3 CLASS TEST 2 2017
8 | P a g e
3.7 Explainvisionintegrationfromthe pointwhere photonsentersthe eye includethe functionsof each
structure throughwhichthe photonstravel. (16)
 Light (Photons) enterthe eye through the cornea,
 Whichbendthe light rays
 aqueoushumour,
 which Transmit light rays and support eyeball
 pupil,
 Whichis a black hole whichAdmits lightinto eye.
 lens,
 which refract lightrays further
 vitreoushumour which transmits lightrays and
 Focusesit on the retina.
 Light stimulatesthe photoreceptors
 (Rods and cones) in the retina.
 Retina sendsan impulse to the optic nerves
 Optic nervessendan impulse tothe occipital lobe
 of the cerebrum
 Where sightis integrated.