At which trophic level would the highest accumulation of a non-biodegradable substance occur?

• A. Primary producers
• B. Tertiary consumers
• C. Primary consumers
• D. Secondary consumers

The respiratory organ found in the cockroach is the

• A. air sac
• B. trachea
• C. lung book
• D. lung

Two organisms of different species, living in close association but not dependent on each other are referred to as

• A. parasites
• B. commensals
• C. symbionts
• D. autotrophs

What ecological condition favours the breeding of black flies?

• A. Fresh water habitat
• B. Water in ponds and swamp
• C. Water in small containers
• D. Fast flowing streams

In which of the following organisms would glycogen be stored?

• A. Spirogyra
• B. Chlamydomonas
• C. Rattus
• D. Magnifera

Which of the following instruments is NOT used in measuring abiotic factors in any habitat?

• A. Microscopic
• B. Thermometer
• C. Hygrometer
• D. Wind vane

Production of naked seeds is a distinctive feature of the group of plant called

• A. grasses
• B. conifers
• C. legumes
• D. palms

Which group of plants would be the first colonizers in an ecological succession changing rocks to soil?

• A. Mosses
• B. Ferns
• C. Lichens
• D. Grasses

What would happen to a man whose pancreas has been surgically removed?

• A. The level of blood sugar would increase
• B. The glycogen content of the liver would increase
• C. His blood pressure would decrease
• D. His weight would increase appreciably

Which of the following mineral salts is a trace element?

• A. Zinc
• B. Carbon
• C. Hydrogen
• D. Potassium