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Biology Past Questions

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5,032 questions

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Question 911

jamb 2010

The chromosome number of a cell before and after the process of meiosis is conventionally represented as?

A2n → 2n

Bn → n

Cn → 2n

D2n → n

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Question 912

jamb 2010

A pair of genes that control a trait is referred to as?

Aan allele

Brecessive

Cdominant

Da hybrid

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Question 913

jamb 2010

Thyroxine and adrenalin are examples of hormones which control?

Ablood grouping

Btongue rolling

Cbehavioural patterns

Dcolour variation

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Question 914

jamb 2010

A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of?

Ataste bud variation

Bdiscontinuous variation

Cmorphological variation

Dcontinuous variation

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Question 915

jamb 2010

The protozoan plasmodium falciparum is transmitted by?

Afemale Anopheles mosquitoes

Bfemale Aedes mosquitoes

Cfemale Culex mosquitoes

DFemale blackfly

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Question 916

jamb 2010

The loss of soil through erosion can be reduced by?

Awatering

Bcrop rotation

Cmanuring

Dirrigation

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Question 917

jamb 2010

The vector for yellow fever is?

AAedes mosquito

BAnopheles mosquito

Ctsetse fly

Dblackfly

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Question 918

jamb 2010

The average number of individuals of a species per unit area of the habitat is the?

Apopulation density

Bpopulation frequency

Cpopulation size

Dpopulation distribution

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Question 919

jamb 2010

The activity of an organism which affects the survival of another organism in the same habitat constitutes?

Aan edaphic factor

Ban abiotic factor

Ca biotic factor

Da physiographic factor

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Question 920

jamb 2010

Low annual rainfall, sparse vegetation , high diurnal temperatures and cold nights are characteristic features of the?

Atropical rainforest

Bdesert

Cmontane forest

Dguinea savanna

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Question 921

jamb 2010

I. Adoption of appropriate nocturnal habits ll. Burrowing lll. Adjusting their internal body temperature. IV Possession of many sweat pores.
Which of the above are ways in which desert animals adapt to extreme heat of the environment?

AI and IV only

Bll and lll only

Cl and ll only

Dl, ll and lll only

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Question 922

jamb 2010

The two halves of the pelvic girdle are joined together at the?

Apubic symphysis

Bilium

Cpubis

Dobturator foramen

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Question 923

jamb 2010

Which of the following organisms is mainly found in the marine habitat?

AAchatina

BTilapia

CDog fish

DTortoise

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Question 924

jamb 2010

The blood component that has the greatest affinity for oxygen is the?

Alymphocytes

Bleucocytes

Cerythrocytes

Dthrombocytes

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Question 925

jamb 2010

The barrier between maternal and fetal blood is the?

Aplacenta

Bliver

Cumbilical cord

Duterine wall

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Question 926

jamb 2010

Mycorrhiza promote plant growth by?

Aabsorbing inorganic ions from the soil

Bprotecting it from infection

Chelping it to utilize atmospheric nitrogen

Dserving as a growth regulator

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Question 927

jamb 2010

A food chain always begins with a?

Aconsumer

Bdecomposer

Cproducer

Dprimary consumer

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Question 928

jamb 2010

I. Stomata → Spirogyra II. Alveoli → Earthworm III. Malpighian tubule → Mammal IV. Contractile vacuole → Protozoa.
Which of the above structures is correctly matched with the organisms in which it is found?

Alll

Bll

DIV

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Question 929

jamb 2010

The part of the human gut that has an acidic content is the?

Astomach

Bduodenum

Cileum

Dcolon

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Question 930

jamb 2010

Chemosynthetic organisms are capable of manufacturing their food from simple inorganic substances through the process of?

Aoxidation

Bdenitrification

Creduction

Dphosphorylation

View Explanation & Discuss

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