JAMB Biology: practice questions.

Question 1 · Excretion

A contractile vacuole is common in freshwater Amoeba but usually absent in marine Amoeba. This is best explained by the fact that

1. A.marine Amoeba produce no nitrogenous waste
2. B.marine Amoeba excrete through flame cells
3. C.freshwater Amoeba lose water to their surroundings and must store it in the vacuole
4. D.water constantly enters freshwater Amoeba by osmosis and must be pumped out

eZine practice question (original, teacher-reviewed)

Question 2 · Nutrition

Rhizopus on a rotting tomato digests the tomato by

1. A.ingesting pieces into a food vacuole
2. B.photosynthesising and storing the sugar
3. C.piercing the cells with haustoria and sucking sap from a living host
4. D.secreting enzymes onto it and absorbing the products

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Question 3 · Growth

A graph of the height of a maize plant against time is S-shaped: slow at first, then rapid, then levelling off. The levelling off is mainly due to

1. A.the plant dying
2. B.the plant starting to germinate
3. C.the plant reaching maturity and growth slowing down
4. D.the plant losing all its leaves

eZine practice question (original, teacher-reviewed)

Question 4 · Biotechnology

Biotechnology is best defined as

1. A.the use of living organisms or their products to make useful goods
2. B.the study of fossils
3. C.the use of machines and tractors to replace human labour on large farms
4. D.the classification of living organisms

eZine practice question (original, teacher-reviewed)

Question 5 · Symbiotic interactions of plants and animals

Large-scale clearing of the rainforest in Ondo State for timber is most likely to affect the water cycle by

1. A.reducing transpiration and so lowering local rainfall
2. B.increasing water vapour in the air above the area
3. C.reducing surface run-off
4. D.increasing infiltration of rain into the soil

eZine practice question (original, teacher-reviewed)

Question 6 · Excretion

Which sequence traces the path of a urea molecule from blood to the outside of the body?

1. A.glomerulus → Bowman's capsule → tubules → collecting duct → ureter → bladder → urethra
2. B.Bowman's capsule → glomerulus → collecting duct → loop of Henle → urethra → bladder → ureter
3. C.glomerulus → collecting duct → Bowman's capsule → ureter → urethra → bladder
4. D.renal vein → glomerulus → Bowman's capsule → bladder → ureter → urethra

eZine practice question (original, teacher-reviewed)

Question 7 · The ecology of populations

Which sequence of colonisers is typical of primary succession on bare rock such as an inselberg near Abeokuta?

1. A.trees → shrubs → grasses → mosses → lichens
2. B.grasses and herbs → lichens → mosses → trees → shrubs
3. C.mosses → trees → lichens → shrubs → grasses
4. D.lichens → mosses → grasses and herbs → shrubs → trees

eZine practice question (original, teacher-reviewed)

Question 8 · Support and movement

The exoskeleton of insects such as the grasshopper is made mainly of

1. A.cartilage
2. B.chitin
3. C.compact bone
4. D.cellulose

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Question 9 · Nutrition

Loranthus growing on a kola tree in Ogbomoso sends special roots into the host's xylem and phloem. These structures are

1. A.rhizoids for anchorage
2. B.root nodules
3. C.haustoria
4. D.pneumatophores

eZine practice question (original, teacher-reviewed)

Question 10 · Living organisms

In the scheme of levels of organisation, Hydra is used as an example of which level?

1. A.Cell
2. B.Organ
3. C.System
4. D.Tissue

eZine practice question (original, teacher-reviewed)

Question 11 · Factors affecting the distribution of organisms

Vegetation on the upper slopes of the Mambilla Plateau differs from that of the surrounding lowlands mainly because, with increasing altitude,

1. A.rainfall stops completely
2. B.temperature falls
3. C.soil becomes more fertile
4. D.day length increases

eZine practice question (original, teacher-reviewed)

Question 12 · Factors affecting the distribution of organisms

Few species of plants grow in the brackish mangrove swamps of the Niger Delta compared with a nearby freshwater swamp. The best explanation is that

1. A.there is too much light in mangrove swamps
2. B.mangrove soil is too dry
3. C.there are no decomposers in brackish water to recycle nutrients
4. D.high salinity causes water loss by osmosis in most plants

eZine practice question (original, teacher-reviewed)