Web & Food Chain
What is the difference between a food chain and a food web?
a) A food chain shows multiple energy pathways, while a food web is a single linear path.
b) A food web shows multiple energy pathways, while a food chain is a single linear path.
c) A food chain includes decomposers, while a food web does not.
d) There is no difference between them.
b) A food web shows multiple energy pathways, while a food chain is a single linear path.
Which of the following organisms reproduces asexually?
a) Humans
b) Bacteria
c) Dogs
d) Frogs
b) Bacteria
What is the main driving force behind natural selection?
a) Human choice
b) Environmental pressures
c) Random changes
d) Artificial breeding
b) Environmental pressures
In a food chain, what type of organism is always at the bottom?
a) Herbivore
b) Decomposer
c) Producer
d) Carnivore
c) Producer
What is a key advantage of sexual reproduction?
a) It produces identical offspring.
b) It allows for genetic variation.
c) It is faster than asexual reproduction.
d) It does not require two parents.
b) It allows for genetic variation.
Which of the following is an example of artificial selection?
a) A cheetah evolving to run faster over millions of years
b) Farmers breeding cows to produce more milk
c) A bird species developing a longer beak to eat deep-seated insects
d) A giraffe’s neck growing longer over generations due to competition for food
b) Farmers breeding cows to produce more milk
Why does only about 10% of energy get passed to the next trophic level?
a) The rest is destroyed.
b) The rest is used by the organism for life processes or lost as heat.
c) The energy disappears naturally.
d) Energy is only transferred fully to top predators.
The rest is used by the organism for life processes or lost as heat.
What type of asexual reproduction occurs when an organism splits into two identical offspring?
a) Budding
b) Fragmentation
c) Binary fission
d) Parthenogenesis
c) Binary fission
What is one potential negative effect of artificial selection?
a) Increased biodiversity
b) Higher genetic diversity
c) Increased risk of genetic disorders
d) Faster natural evolution
c) Increased risk of genetic disorders
What would most likely happen if all primary consumers in a food web disappeared?
If all primary consumers disappeared, herbivorous animals would be gone, causing a decline in predator populations due to lack of food. Meanwhile, producers (plants) would overpopulate without herbivores to control them, leading to an imbalanced ecosystem.
Name two organisms that reproduce both sexually and asexually. (Short Answer)
Examples: Starfish, jellyfish, aphids, sponges, hydra, some types of fungi
How does antibiotic resistance in bacteria demonstrate natural selection? (Short Answer)
Bacteria with a natural resistance to antibiotics survive and reproduce, while non-resistant bacteria die. Over time, the population becomes more resistant as these survivors pass on their genes. This is an example of natural selection favoring beneficial traits in response to an environmental pressure (antibiotics).
How can pollution affect a food chain? (short answer)
What is the disadvantage of asexual reproduction in changing environments? (Short Answer)
What is the difference between selective breeding and genetic engineering? (Short Answer)