A dehiscent fruit formed from several fused carpels with many seeds is classified as

A. an achene

B. a capsule

C. a follicle

D. a legume

E. a nut

The translocation of food materials in plants takes place in the

A. xylem

B. cambium

C. phloem

D. parenchyma

E. sclerenchyma

An association between living organisms in which one lives on and feeds at the expense of the other
organism is known as

A. parasitism

B. commensalism

C. mutualism

D. symbiosis

E. predation

Which of the following statements is not correct about food chains?

A. All food chains start with a green plant

B. Food chains involve feeding relationships among organisms

C. horter food chains indicate more effective utilization of energy than longer ones

D. There is no energy loss in a food chain

E. All food chains have primary consumers.

Which of the following characteristics is associated with commensalism?

A. Both organisms are harmful to each other

B. The association involves many organisms

C. The association is beneficial to one of the organisms

D. Both species are beneficial to each other

E. This relationship is found only among higher plants

Which of the following statements is not correct about the ecological effects of agricultural activities?

A. The use of herbicides and pesticides in farms can cause pollution

B. Bush-burning encourages desertification

C. Excessive use of fertilizers in farms may have harmful effects

D. Tillage of tropical soils with ploughs and harrows may encourage erosion

E. Monocropping is one of the cultural methods of controlling pests.

Pests can be controlled without the subsequent danger of polluting the ecosystem by

A. introducing a population of species similar to that of the pest

B. increasing the population of the natural enemies of the pest

C. eliminating the natural enemies of the pest

D. keeping the population of natural enemies of the pest constant

E. spraying the ecosystem with pesticide

The activities of an organism which affect the survival of another organism in a habitat can be described as

A. biotic factors

B. climatic factors

C. physiographic factors

D. edaphic factors

E. abiotic factors

Which of the following. groups of organisms feeds directly on green plants?

A. Producer

B. Decomposer

C. Primary consumer

D. Secondary consumer

E. Tertiary consumer

Which of the following methods is used in food preservation for a long period?

A. adding oil to food

B. Exposing food to fresh air

C. keeping the food in a store

D. Warming the food daily

E. Salting and drying the food