The specific role of a species within íts environment is known as its_________

• A. habitat
• B. niche
• C. trophic level
• D. biotic community

The activity of ptyalin is likely to decrease with an increase in the concentration of

• A. oxygen
• B. starch
• C. protein
• D. acid

Which of the following factors can bring about competition in population?

• A. dispersion
• B. emigration
• C. drought
• D. mortality

A purple colour was obtained when sodium hydroxide solution and a drop of copper sulphate solution were added to a food substance. The food substance is likely to be a

• A. carbohydrate
• B. fat
• C. protein
• D. sugar

The product after the union of the male and female gamete in animals is called

• A. sperm
• B. egg
• C. embryo
• D. zygote

Hormones are transported around the mammalian body by

• A. water
• B. nerves
• C. blood
• D. osmosis

The cytoplasm of the cell is considered a very important component because it

• A. regulates the amount of energy in the cell
• B. suspends all cell organelles.
• C. is the outermost part of the cell
• D. is solely responsible for cell division

The unit contained in a cell structure responsible for changes in form and shape of organisms is called

• A. mitochondria
• B. gene
• C. ribosome
• D. lysosome

An example of a sex linked trait is the

• A. ability to grow long hair in females
• B. colour of the skin in humans
• C. ability to roll the tongue
• D. possession of facial hair in adult humans

The part of mammalian skin that excretes metabolic wastes is

• A. sweat gland
• B. horny layer
• C. Malpighian layer
• D. sebaceous gland