Biology - Mock Test 273

Question 2721

The first eukarotes appeared about ______ years ago?

A) 1.5 billion B) 2.5 billion C) 3.5 billion D) 4.5 billion

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Question 2722

The structure which has been formed or modified from gill pouches in humans is?

A) Gills B) Eustachian tube C) Middle ear D) Lungs

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Question 2723

The one which is present in all aerobic species?

A) Cytohrome c B) Cytochrome a C) Cytochrome a3 D) Cytochrome b

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Question 2724

Animals with greatest number of similarities are grouped together in a/an?

A) Phylum B) Family C) Genus D) Order

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Question 2725

Which of the following relationship is NOT an example of symbiosis?

A) Rhizobium and leguminous plants B) Marchantia sporophyte and gametophyte C) Algae and fungi in a lichen D) Mycorrhizal fungi and tree roots

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Question 2726

In most ecosystems the greatest amount of energy flows through the?

A) Secondary consumers B) Herbivores C) Carnivores D) Decomposers

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Question 2727

Competition between species will be greatest if they attempt to occupy the same?

A) Ecosystem B) Community C) Habitat D) Niche

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Question 2728

All of the following are involved in nitrification except?

A) Nitrobacter B) Nitrosomonas C) Rhizohium D) All of these

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Question 2729

What percentage of light reaching the earth is used in photosynthesis?

A) 25% B) 10% C) 5% D) 1%

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Question 2730

What is the characteristic feature of consumers?

A) Autotroph B) Heterotroph C) Parasite D) Saprophyte

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