Lecture Script:
In today's lecture, we will discuss the profound impact of climate change on various ecosystems around the world. Climate change, as a result of human activities such as deforestation and burning of fossil fuels, has led to significant alterations in ecosystems. Let's delve into some examples to better understand this complex issue.

Imagine a tropical rainforest, known for its high biodiversity. Due to rising temperatures and changing rainfall patterns, many species of plants and animals are struggling to adapt. For instance, certain tree species that rely on specific temperature ranges for reproduction are facing decline, affecting the entire food chain.

Moving on to marine ecosystems, the warming of oceans has caused coral bleaching events. Coral reefs, often called the 'rainforests of the sea,' are crucial habitats for numerous marine species. When corals experience stress due to increased water temperatures, they expel the algae living in their tissues, leading to their bleaching and eventual death.

Now, let's consider the Arctic region. Melting ice caps due to global warming are not only affecting polar bears and other iconic Arctic animals but also indigenous communities that depend on ice for their traditional way of life. The disappearance of sea ice disrupts the ecosystem's balance and poses challenges for both wildlife and human populations.

Student: How can individuals contribute to mitigating the effects of climate change on ecosystems?
Professor: Excellent question. Individuals can make a difference by reducing their carbon footprint through actions like using public transportation, conserving energy at home, and supporting sustainable practices.

Questions:
1. What is one example of the impact of climate change on tropical rainforests?
A) Increased biodiversity
B) Enhanced adaptability of species
C) Decline in tree species due to changing temperatures
D) Stable food chain

2. How does coral bleaching affect marine ecosystems?
A) Improves biodiversity
B) Enhances coral growth
C) Leads to increased algae presence
D) Causes coral death due to stress

3. Which ecosystem is particularly affected by the melting of ice caps in the Arctic region?
A) Desert ecosystems
B) Tropical rainforests
C) Arctic ecosystems
D) Grasslands

4. What is the significance of coral reefs in marine ecosystems?
A) They are unnecessary for ecosystem balance
B) They provide homes for land animals
C) They are crucial habitats for marine species
D) They contribute to air quality

5. What action can individuals take to reduce their carbon footprint?
A) Drive personal vehicles more frequently
B) Consume more energy at home
C) Support unsustainable practices
D) Use public transportation and conserve energy

Answer Key:
1. (C)
2. (D)
3. (C)
4. (C)
5. (D)