Exercise - Nature's Food Source

A. Write the number of the correct answer in the brackets.

1.	When a dead organism decomposes, ________ is given out.		()
	(1) (2) (3) (4)	oxygen carbon dioxide water bacteria
2.	When a green plant is placed next to a window where sunlight comes in, after a month the stem ________.		()
	(1) (2) (3) (4)	bends away from the window bends toward the window does not bend at all becomes shorter
3.	When iodine solution comes into contact with starch it __________.		()
	(1) (2) (3) (4)	turns from brown to dark blue turns from dark blue to brown remains dark blue remains brownish
4.	A ________ provides the environment necessary for living things to survive.		()
	(1) (2) (3) (4)	place surrounding habitat condition
5.	The excess sugar which a plant produces is converted into________.		()
	(1) (2) (3) (4)	starch energy stem fibre nutrients
6.	Along a food chain, the energy that is stored and transferred from one organism to the next ________.		()
	(1) (2) (3) (4)	becomes more and more remains the same becomes less and less depends on the organism
7.	Food chains are interconnected because animals ________.		()
	(1) (2) (3) (4)	share their food eat more than one type of food eat only other animals depend on one another to survive
8.	Bacteria which live and feed on living organisms are called ________.		()
	(1) (2) (3) (4)	decomposers destroyers body helpers parasites
9.	In this food chain: Maize ---> Mouse ---> Snake		()
	(1) (2) (3) (4)	Snake is prey, mouse is predator. Maize is prey, mouse is predator. Mouse is prey, snake is predator. Mouse and snake are predators.
10.	When plants absorb water from the soil, __________ is also being absored at the same time.		()
	(1) (2) (3) (4)	mineral salts soil iodine methane

B. Write "T" for true and "F" for false.

1.	A tiger is a carnivore.	()
2.	Stomata are found on plant stem.	()
3.	Food is a source of energy for living things.	()
4.	Plants are the start of the food chain.	()
5.	The cutting of trees by man is a great help to the environment.	()
6.	A caterpillar is a herbivore.	()
7.	Fertilizers are derived from the decomposition of dead organisms.	()
8.	Animals like wood lice are not decomposers.	()
9.	Deers eat plants and meat.	()
10.	In a food chain, the population of each organism does not affect the others.	()

C. Fill in the blanks with the most suitable word.

1.	For photosynthesis to occur ____________, ____________, ____________ and ____________ must be present.
2.	Fungi can usually be found on ______________.
3.	In extreme cold conditions, bacteria can exist in an _________ state.
4.	During photosythesis, green plants produce ____________ and ____________.
5.	Bread mould is a type of ____________.