CHAP 10 ORGANISMS AND THEIR ENVIRONMENT

Question 1

what are producers?

Answer 1

an organism that makes it own food as it contains chlorophyll, that absorbs light to convert carbon dioxide & water into glucose through photosynthesis. Glucose is a chemical store of energy , oxygen is also released in the process.

Question 2

what are consumers?

Answer 2

organisms that cannot make its own food, obtains nutrients and energy by feeding on other organisms.

Question 3

what can consumers be classified as? [3]

Answer 3

primary consumer- organisms that feed on plants ONLY
secondary consumer- organisms that feed on PRIMARY consumers
tertiary consumer- organisms that feed on SECONDARY consumers

Question 4

what are decomposers?

Answer 4

organisms that get their energy & nutrients by breaking down dead organisms, faeces and excretory products. -> their activity return nutrients like mineral salts to the environment. [ bacteria & fungi ]

Question 5

define POPULATION

Answer 5

a group of organisms of the same species that live together in a habitat

Question 6

define COMMUNITY

Answer 6

made up of all the populations of different species living & interacting with one another in a habitat [ living + non-living things]

Question 7

define ECOSYSTEM

Answer 7

a community of organisms interacting with one another and with its non living environment

Question 8

FOOD CHAIN

Answer 8

a series of organisms, beginning with the producer, through which energy and nutrients are transferred