Which of the following substances pass through the root cell membrane by osmosis?

• A. Ceil sap
• B. Carbon dioxide
• C. Oxygen
• D. Water

Trees in Savanna habitats usually have thick bark which mainly.

• A. Reduces the rate of transpiration
• B. Protect them from scorching sun
• C. Protect them from heavy winds
• D. Resist bush fires

The study of an individual organism or a single species of organism and its environment is

• A. Autecology
• B. Ecological concepts
• C. Synecology
• D. Biotic composers

Raw materials required by green plants to manufacture their food are

• A. mainly fluids
• B. inorganic substances
• C. living materials
• D. mainly gases

Competition among individuals of a population increases the

• A. Number of organisms
• B. Availability of nutrient supplied
• C. Survival of the fittest
• D. Enlargement of the territory

The period of inactivity seen in some animals during long period of heat or drought is

• A. Migration
• B. Aestivation
• C. Hibernation
• D. Adaptation

Which of the following substances has the highest amount of energy in joules per unit weight?

• A. Carbohydrates
• B. Fats
• C. Proteins
• D. Vitamins

The specific portion of a habitat which is occupied by a particular species is referred to as

• A. Ecological population
• B. Ecological niche
• C. Biotic community
• D. Ecosystem

Inheritable character/features possessed by an organism can be referred to as

• A. Genes
• B. Locus
• C. Traits
• D. Allelo morphs

In natural selection, Darwin proposed that evolution occurred because of the following conditions except

• A. that nature selects those that will survive to reproduce their kind
• B. there is a fierce competition among the offspring
• C. that the weaker offspring are eliminated
• D. food and other needs are abundant