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WorksheetsSPM Form 4 Chapter 8 Dynamic Ecosystem
Total questions: 38
Worksheet time: 24mins
Diagram shows a crab with barnacles on its shell.
What is the interaction between the crab and the barnacles?
(a)
Diagram shows a pond ecosystem.
Which of the organisms labelled A, B, C or D is at the highest trophic level?
A
B
C
D
R and S are two organisms which have benefits for each other in an interaction. Which of the following are R and S?
R: Owl S: Rat
R: Shark S: Remora fish
R: Alga S: Fungus
R: Pigeon Orchids S: Branches of tree
In the nitrogen cycle, nitrogen gas in atmosphere will be converted into nitrate by bacteria X.
What is bacteria X?
Nitrogen-fixing bacteria
Nitrifying bacteria
Denitrifying bacteria
Purifying bacteria
The following are information about Rhizobium sp. on legume plant.
- Rhizobium sp. live in roots nodule of legume plant.
- Rhizobium sp. obtains glucose from the legume plants
What is the role of Rhizobium sp. in roots nodule?
Convert glucose to starch
Convert nitrate into glucose
Fix atmospheric nitrogen into ammonium compounds
Fix nitrite into nitrate
Which of the following are abiotic components in an ecosytem?
I. Consumer
II. Decomposer
III. Humidity
IV. Light intensity
I and II only
III and IV only
I and III only
II and IV only
Diagram shows an interaction between snowshoe rabbit and Canada lynx. The interaction is
Saprophytism
Intraspecific competition
Interspecific competition
Prey-predator
Diagram shows the energy flow in a food chain. What is the amount of energy received by the secondary consumer if the energy produced by the plant is 50000 kJ?
5 kJ
50 kJ
500 kJ
5000 kJ
The following information is related to a process occur in an ecosystem.
- The pioneer species is replaced by a new species which is more adapted to the habitat.
- The process occurs gradually over a long period of time.
- The process end with a climax community.
What is the process?
Colonisation
Competition
Succession
Evolution
Diagram shows the root structure of a mangrove plant.
Prop root
Buttress root
Pneumatophore
Viviparous
Which of the following is the correct sequence in the process of plant succession in a mangrove swamp?
Avicennia sp. → Rhizophora sp. → Soneratia sp.
Avicennia sp. → Rhizophora sp. → Brugeira sp.
Soneratia sp. → Bruguiera sp. → Rhizophora sp.
Bruguiera sp. → Rhizophora sp. → Avicennia sp.
An abandoned housing project can form a primary forest. Which of the following sequence is correct in the formation of the primary forest?
Successor → pioneer → climax community
Pioneer → successor → climax community
successor → climax community → pioneer
Pioneer → climax community → successor
The following statement is an adaptive characteristics of a mangrove tree.
- Germination occurs when the seeds are still attached to the parent plant.
The adaptive characteristics above refers to
Oviparity
Pneumatophores
Viviparity
Prop roots
The following information is about habitat.
- Habitat: school field
- Size: 50m x 100m
- Type of plants: Mimosa pudica
Which of the following is the most suitable method used to estimate the population of the plants in the habitat?
Capture, mark, release and recapture
Quadrat size 1m x 1m
Quadrat size 5m x 5m
Counting
Table shows the data obtained form an experiment to study the population of snails in an area.
Estimate the size of population of snails in an area.
17
212
272
362
Table shows the sampling results obtained on plant X in a school field using a one meter square quadrat.
What is the percentage frequency of plant X?
6/m2
60/m2
8%
80%
Agatha carried out a study on the population of grass X in a garden. She uses the quadrat sampling technique in the study. Table shows the result of the study. (Each quadrat is one meter square.)
The percentage coverage of grass X in the garden is
45.4%
4.54%
75.7%
0.76%
Table shows the results of a field study to determine the frequency of a plant species, Mimosa pudica, in a field by using the quadrat sampling technique.
The frequency of Mimosa pudica in the field is
20%
40%
60%
80%
Table shows the number of plant P present in 7 different quadrats, each measuring 1mx1m.
Calculate the density of P.
0.13 %
13.14 m2
1314%
15 m2
The following information refers to a kingdom in the classification of organisms.
- unicellular organisms
- have a cell wall
- no membrane-bound organelles
- the genetic material is scattered in the cytoplasm
This organism belongs to which kingdom?
Monera
Fungi
Protista
Plantae
Diagram shows two types of sharks, Carcharhinus longimanus and Carcharhinus obscurus.
Which of the following is the difference between these two types of sharks?
species
family
genus
class
The biotic factor and abiotic factor of a pond system is ___________ and ____________ respectively.
hydrilla; fish
temperature; pH
pH; hydrilla
fish; temperature
Which of the following parameter is not an abiotic component of an ecosystem?
pH
Humidity
Temperature
Decomposer
____________ consists of living and non-living things interact with each other.
Ecosystem
Community
Population
Niche
Topography is the physical feature of a land which concerns:
I attitude
II altitude
III gradient
IV aspect of a region
I, II
II, III
I, II, III
II, III, IV
Diagram above shows a food web.
Which organisms are in the second trophic level?
Bird, tadpole
Snail, fish
Bird, fish, small animals
Snail, tadpole, small animals
In an abandoned pond, pioneer species begins to grow and carry out photosynthesis. How pioneer species can begin to survive in such neglected pond?
They can decompose faster
They can absorb more oxygen
They are highly adaptive to dry or nutrient-poor environment
They grow very fast
Mangrove plants act as a natural barrier that absorbs energy waves. Which characteristics of the mangrove plants can help to reduce the damage to the coastal area?
I, II
I, III
II, IV
III, IV
Based on diagram above, why does such method of reproduction enable mangrove species to overcome unsuitable ground condition?
The radical seedlings can float and be carried away by water.
The radical seedlings can absorb moisture in the air.
The radical seedlings can drop into the ground and hide themselves.
The shape of radicle looks like a snake can scare off some animals.
The following information is a sampling technique to estimate the population size of garden snails in a habitat.
P – Capture at random a number of garden snails and record the number which are marked
Q – Release the garden snails in the same habitat
R – Capture a large number of garden snails and mark each shell
S – Calculate the population of the garden snails
Which sequence is correct?
R -- Q -- P -- S
P -- R -- Q -- S
R -- S -- Q -- P
P -- S -- R -- Q
Viruses are the smallest microorganisms visible on earth. Which of the following is true about viruses?
It can be seen under light microscope.
It is a still living cell, though it cannot carry out living processes outside a host.
It is made up of DNA or RNA surrounded by a protein coat.
It cannot reproduce.
Both the lion and the cheetah eat some of the same prey in this ecosystem. Two organisms going after the same resource is known as
Mutualism
Parasitism
Competition
Commensalism
What is a habitat?
The natural home or environment of an animal, plant, or other organism.
The interrelationship of a species with all the biotic and abiotic factors affecting it.
A biological community of interacting organisms and their physical environment.
The natural home or environment of non-living organisms.
What is a niche?
The place or function of a given object within its ecosystem.
The place or function of a given organism within its ecosystem.
The natural home or environment of an animal, plant, or other organism.
The natural home or environment of an object.
In a predator-prey relationship, _____.
the predator hunts the prey for food
the prey hunts the predator for food
the prey keeps the predator population from growing too large
the prey are producers
Samantha plants some flowers in a flower bed and then ignores them. Soon weeds grow and the flowers die. The weeds had been able to get enough resources to survive, while the flowers had not. This is an example of _____.
competition
population size
habitat
community
A climax community is a community that ________.
is about to experience a major change
has just been radically altered by a natural disaster
is a stable community that no longer goes through major ecological change
is always characterized by large trees
A community consists of all the organisms in an ecosystem that belong to the same species.
True
False
