Chapter 9 in AP Board Class 9 Biology textbook focuses on helping students to learn how organisms are starting to inhabit certain areas, what needs they have and how they acquire different conditions from their surroundings to meet them. Students will study about adaptations that happen in different scenarios like;
- Adaptations in Desert
- Adaptations in the Aquatic Ecosystem
- Adaptations on the Basis of Light Penetration
- Adaptations to Temperature
- Adaptations as a Response to Adverse Situations
- Coringa mangrove and ecosystem
Why do animals need to adapt to a new Ecosystem?
In order to adjust themselves to diverse and distinct changes in ecosystems, living organisms or animals have to constantly adopt different means for better survival. Different adaptations are found in organisms in water ecosystems as well as other areas. Usually, organisms for their survival develop special characters to adapt themselves to temperature, water availability, pressure, etc.
Some forms of Adaptations
In temperate regions, some types of plants shed their leaves just before winter. Most of the xerophytic plants have a succulent, fleshy and green coloured stem instead of big leaves. Animals that are found in cold regions have a thick fur coat and a fat layer below their skin that act as insulators. Hibernation and Aestivation seen in amphibians like frogs is a clear example of adaptation.
Students can read some of the questions below and learn about some of the interesting chapter topics.
Question 1: Name the different zones of the marine ecosystem.
Answer: Marine ecosystem is divided as euphotic, bathyal and abyssal zones.
Question 2: Give some examples of animals that have adapted to the desert ecosystem.
Answer: The kangaroo rat found in the Western North American desert is able to live without drinking water throughout its life. The rat’s body can synthesise little water in the process of digestion. The fennec fox has a furry sole that helps it to walk on hot sand and it loses heat through its ears.
Question 3: What are the main adaptations that give hydrilla an advantage over native plants?
Answer: The main adaptations that give hydrilla an advantage over other native plants are: it can grow at low light intensities, it is better at absorbing carbon dioxide from the water (diffuses into leaves), it is able to store nutrients for later use, it can tolerate a wide range of water quality conditions for example salinity(can grow in saline waters as well), and it can propagate sexually and asexually.
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