variation worksheet
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Variation Worksheet for biologyTRANSCRIPT
Pakistan International School, English Section, RiyadhBiology Worksheet: 1Chapter: 15 VariationGrade: 7Name: _____________________ Section: _______________Q1: Classify the following variations as either;i) Caused entirely by genetic effects.ii) Caused by a combination of genetic and environmental effects.
Obesity Eye colour TallnessGenderBlood group Natural hair colour
Caused entirely by genetic effectsCaused by a combination of genetic and environmental effects
Q2: Differentiate between genus and species?GenusSpecies
Q2: Following are the scientific names of some organisms, along with their common names in brackets:
Canis familiaris (Dog) Equus caballus (Pony) Canis mesomelas (Jackal) Equus burchelli (Zebra) Commiphora angolensis (Sand Corkwood) Commiphora africana (African Myrrh)
a) Write down the scientific name of two organisms which have same genus?
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b) Write down the common name of two organisms that have different genus?____________________________________________________________________
Q3: Look at the figures given below:
Identify the group for each organism to which it belongs and write down only one characteristic of that group:
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Q4: Identify the scientific names of following organisms with the help of dichotomous key:i) Dichotomous key I:
Dichotomous key to representative birds
1. a. The beak is relatively long and slender (very narrow) .. Certhidea b. The beak is relatively stout (thick & strong) and heavy .. Go to 2
2.a. The bottom surface of the lower beak is flat and straight . Geospiza b. The bottom surface of the lower beak is curved . Go to 3
3.a. The lower edge of the upper beak has a distinct (clear) bend Camarhynchus b. The lower edge of the upper beak is mostly flat .. Platyspiza
ii) Dichotomous Key II:
Dog Shark Rose Skunk
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Dolphin Eagle Canary Mushroom
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Oyster Mosquito Cow
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Ivy Pine tree Turkey
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1.animalnot an animalgo to 2go to 11
2.has wingsno wingsgo to 3go to 6
3.has feathersno feathersgo to 4Ochloerotatus taeniorhynchus
4.flies highdoes not fly highgo to 5Meleagris gallopavo
5.often yellownot yellowSerinus canariaHaliaeetus leucocephalus
6.lives in waterlives on landgo to 9go to 7
7.has fluffy furno fluffy furgo to 8Bos taurus
8.common pet not a common petCanis familiarisMephitis mephitis
9.has finsno finsgo to 10Haematopus ostralegus
10.razor sharp teethpegged, pointy teethCarcharodon carchariasTursiops truncates
11.greennot greengo to 12go to 13
12.grows talldoes not grow tallPinus ponderosaRhus toxicodendron
13.can be poisonousnot poisonousBoletus edulisRosa sylvestris
Q5: Identify the common names of organisms by the help of dichotomous key: (A) (B) (C)________________ _______________ ____________ (D)_____________ (E)_______________ (F)__________
(G)_________________ (H) ________________ (I) _________
(J)________________ (K)__________________ (L)________Create a dichotomous key using the following list of specimens: pine tree, clam, rock, robin, tin can, deer, oak tree, mouse, dandelion, Paramecium, bicycle, antHere's an example in written form using these items:
1. a. Organism is living........................................................go to 4.1. b. Organism is nonliving..................................................go to 2.
2. a. Object is metallic........................................................go to 3.2. b. Object is nonmetallic..................................................ROCK.
3. a. Object has wheels......................................................BICYCLE.3. b. Object does not have wheels......................................TIN CAN.
4. a. Organism is microscopic...................................PARAMECIUM.4. b. Organism is macroscopic............................................go to 5.
5. a. Organism is a plant.....................................................go to 6.5. b. Organism is an animal.................................................go to 8.
6. a. Plant has a woody stem..............................................go to 7.6. b. Plant has a herbaceous stem.................................DANDELION.
7. a. Tree has needle like leaves.....................................PINE TREE.7. b. Tree has broad leaves............................................OAK TREE.
8. a. Organism lives on land................................................go to 9.8. b. Organism lives in water...............................................CLAM.
9. a. Organism has 4 legs or fewer......................................go to 10.9. b. Organism has more than 4 legs...................................ANT.
10 a. Organism has fur........................................................go to 11.10 b. Organism has feathers................................................ROBIN.
11 a. Organism has hooves.................................................DEER.11 b. Organism has no hooves............................................MOUSE.Page 1 of 13