Neco GCE 2018 Practical Biology Answers/Expo/Runz

Neco GCE 2018 Practical Biology Answers/Expo/Runz

(1ai)

Experiment to demonstrate osmosis in a living tissue(Yam tuber)

(1aii)

A-The volume of the sugar solution in the yam tuber increases

B-The volume of water in the yam tuber remains unchanged

(1aiii)

It serves as the semi-permeable membrane

(1aiv)

Set up B serves as the control experiment

(1av)

-Cellophane paper

-Pig bladder

(1avi)

-It makes osmo-regulation possible

-It enhances regulation of waterin the urinary tubules

(1bi)

Toad

(1bii)

I-Webbed digit

II-Nostril

IV-Tympanum

V-Nictating membrane

(1biii)

Amphibian

(1biv)

-Possesion of webbed digit for swimming

-Possesion of wide mouth for sieving and eating

-Possesion of long hind limb for escape

(1ci)

Atlas

(1cii)

I-Neural spine

II-Neural arch

III-Neural canal

IV-Vertebraterial canal

V-Centrum

(1ciii)

Neck

1bi) Specimen c = Toad

1biii) Class Amphibian

1biv) – For vison

         –  Locomotion

=======================

2ai) E = Tomato Fruit

       F = Cowpea fruit

       G = Coconut fruit

2aii) E = Man

         F= Explosive mechanism

         G = Water

2aiii)  i – Stalk

           ii – Endocarp

           iii – Seed

           iv –  seed

           v – Endocarp

           vi – Mesocarp

2bi) Bird

 2bii) Aves

2biii) i – Head

          ii – Beak

          iii – Opening into the eye

          iv – Wing cover

          v – Foot

          vi- Claw

2biv) 

       i – For picking grains

       ii – To detect Vibration

       iii-  For flight

       iv – for scratching the sand or fround

       v – For steering during flight

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3bi. 

I structure of the sperm >>spermatozoa

II. Acrosome

I. Nucleus rich in DNA

III. Mitochondria

Iv.Tail sheath

3i. It enhances penetration of eggs during fertilization. 

ii. Help to move

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