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AP Environmental Science
Unit 3: Populations
3.2 K-Selected and r-Selected Species
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What is the defining characteristic of K-selected species in terms of reproduction?
Low reproductive rate
K-selected species tend to live relatively
long
lives.
K-selected species are typically smaller in size compared to r-selected species.
False
What type of parental care do K-selected species provide?
Intensive parental care
K-selected species thrive in stable environments near their
carrying capacity
.
What is the primary reproductive strategy of r-selected species?
High reproductive rate
r-selected species have relatively short
lifespans
.
How much parental care do r-selected species invest in their offspring?
Minimal parental care
r-selected species thrive in stable environments near carrying capacity.
False
What type of parental care do K-selected species invest in their young?
Intensive parental care
r-selected species thrive in fluctuating
environments
.
r-selected species typically have long lifespans.
False
What is the primary focus of K-selected species regarding their offspring?
Intensive parental care
r-selected species have a high reproductive
rate
.
r-selected species invest significant time and effort in raising their young.
False
What do r-selected species prioritize over individual survival?
Reproduction
K-selected species have a low reproductive
rate
K-selected species are typically small in size.
False
What type of parental care do K-selected species provide?
Intensive
K-selected species thrive in environments near their carrying
capacity
r-selected
species have short lifespans.
How much parental care do r-selected species provide?
Minimal
r-selected species thrive in fluctuating or unstable
environments
Arrange the characteristics to compare K-selected and r-selected species:
1️⃣ Low Reproductive Rate vs. High Reproductive Rate
2️⃣ Long Lifespan vs. Short Lifespan
3️⃣ Intensive Parental Care vs. Minimal Parental Care
4️⃣ Stable Environment vs. Fluctuating Environment
5️⃣ Large Body Size vs. Small Body Size
What is the primary characteristic of K-selected species in terms of reproductive rate?
Low
K-selected species thrive in environments near their carrying
capacity
r-selected species are adapted to stable environments.
False
Match the K-selected species with their habitat and key characteristics:
African Elephant ↔️ Savanna, grasslands ||| Large size, long lifespan, intense parental care
Humans ↔️ Various ||| Low reproduction rate, long lifespan, extensive parental care
Blue Whales ↔️ Oceans ||| Largest animal, long lifespan, low reproduction rate
What is a characteristic of r-selected species in terms of lifespan?
Short
r-selected
species
are effective colonizers in fluctuating habitats.
Match the advantages and disadvantages of K-selection:
Long lifespans ↔️ Slow reproduction rate
Strong competitive abilities ↔️ High energy investment in offspring
High parental care ↔️ Vulnerability to environmental changes
K-selected species thrive in environments near their carrying
capacity
Arrange the characteristics to compare K-selected and r-selected species:
1️⃣ Low Reproduction vs. High Reproduction
2️⃣ Long Lifespan vs. Short Lifespan
3️⃣ Intensive Parental Care vs. Minimal Parental Care
4️⃣ Stable Environment vs. Fluctuating Environment
What is a key difference between K-selected and r-selected species in terms of lifespan?
Long vs. Short
K-selected species invest heavily in parental
care
r-selected species thrive in stable environments.
False
What type of parental care do K-selected species provide?
Intensive
An example of a K-selected species is the African
Elephant
Arrange the characteristics of K-selected species in order of their ecological significance:
1️⃣ Low Reproductive Rate
2️⃣ Long Lifespan
3️⃣ Large Size
4️⃣ Intensive Parental Care
What is a notable characteristic of humans as a K-selected species?
Extensive parental care
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