default_background
✕

Find the best tutors and institutes for Class 12 Tuition

Find Best Class 12 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q8:
Describe one example of adaptive radiation.

Solution :

Definition and Theoretical Framework

Adaptive radiation is an evolutionary process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches [Per the principles of Evolutionary Biology and Neo-Darwinism].

Example: Darwin’s Finches of the Galápagos Islands

The most iconic example of adaptive radiation is observed in the finches of the Galápagos Islands, as documented by Charles Darwin during the voyage of the H.M.S. Beagle. These birds evolved from a single ancestral species that migrated from the South American mainland to the isolated archipelago.

Ancestor Seed-crusher Insect-eater Cactus-feeder Fruit-eater

Mechanism of Diversification

  • Geographic Isolation: The archipelago provided diverse, isolated habitats with varying resource availability [By the Principle of Allopatric Speciation].
  • Ecological Opportunity: Upon arrival, the ancestral finches encountered an environment with limited competition. This released them from stabilizing selection, allowing for the exploitation of diverse food sources [Per the Ecological Niche Theory].
  • Selection Pressure: Natural selection acted primarily on the beak morphology of the finches. Birds with beaks suited for specific food sources (seeds, insects, cactus fruits, or flower nectar) had higher fitness and reproductive success.

Comparative Morphological Data

Species/Type Primary Diet Beak Adaptation
Ground Finches Seeds Strong, heavy, blunt beak for crushing.
Tree Finches Insects Grasping, slender beak for precision.
Cactus Finches Cactus fruits/pollen Longer, down-curved beak for reaching.

Evolutionary Significance

This process demonstrates divergent evolution, where structures (the beak) arise from a common origin but evolve into distinct forms to serve different functions [Per the Homology Criterion]. The accumulation of these differences over generations eventually led to the formation of multiple distinct species from the original mainland immigrant, confirming that adaptive radiation is a critical driver of biodiversity.

Final Solution: Darwin's Finches represent adaptive radiation by evolving from a common ancestral species into various distinct forms with specialized beak morphologies to exploit different ecological niches within the Galápagos Islands.


More Questions from Class 12 Biology Evolution EXERCISES


CBSE Solutions for Class 12 Biology Evolution


Chapters in CBSE - Class 12 Biology


Top Tutors who teach Evolution

(27)
Top Tutor
locationImg Dholai, Jaipur
experience 5 yrs of Exp students 6 students
greenClock 236 hrs of classes completed
rsIcon 400 per hour
Teaching is passion and hobby
Online Classes Online Classes

I teach students thoroughly as teaching is my hobby,I try to understand student point of view first then proceed accordingly, prefer to teach students from board qualified books along with refreshers,being an MBA I believe in using latest methodology like powerpoint presentation including animation,videos . Practical approach with real examples,result is guaranteed,focuses on achieving goals of independent learning, learner autonomy, self-reflection, knowledge construction, collaborative or group-based learning, E learning is also a way of adding extra value and service to traditional educational services

Skills: Economics , Business and Management and more
Also teaches: Hindi Language, BBA Tuition and more

(51)
superTutorSuper Tutor
locationImg Sector 75, Faridabad
experience 9 yrs of Exp students 31 students
greenClock 358 hrs of classes completed
rsIcon 1500 per hour
Accountancy and Economics ( Best in the game)
Online Classes Online Classes
homeTutions Student's Home

I step into the world of education driven by a deep-seated passion for teaching, bringing a wealth of experience in the realms of Accounts, Economics, and Business Studies for Class 11th and 12th. My journey as an educator commenced in 2016, and it has been a fulfilling odyssey ever since. In my pursuit of imparting knowledge, I have chosen both online and offline avenues. Whether through the virtual realm or in the comfort of students' homes, my commitment to fostering a comprehensive understanding of Accounts, Economics, and Business Studies remains unwavering. As a seasoned professional in the teaching landscape, I specialize in the intricate subjects that form the backbone of commerce education. My approach is rooted in the belief that education should not only be informative but also transformative. I strive to make complex concepts accessible, enabling students to navigate the challenges of Class 11th and 12th with confidence. I hold a firm belief that teaching is not just a profession; it's a calling. It's about instilling a love for learning, nurturing critical thinking, and preparing students for the dynamic world of commerce. Through a blend of online and offline methodologies, I aim to create an engaging and effective learning experience for every student under my guidance. Join me on this educational journey, where the pursuit of knowledge is not just a task but a shared adventure. Together, let's unravel the intricacies of Accounts, Economics, and Business Studies. Looking forward to our learning voyage!

Asmaa

The classes are extremely helpful in understanding the concepts and forming full understanding of the subject. The notes given provide an easy review for the exam and the revision classes allow complete recall for the exams.

Skills: Economics , Accountancy and more
Also teaches: Class 11 Tuition

Rinky A. Class 12 Tuition trainer in Delhi
(63)
Top Tutor
locationImg New Ashok Nagar, Delhi
experience 20 yrs of Exp students 8 students
greenClock 513 hrs of classes completed
rsIcon 600 per hour
Highly Qualified teacher with 25 years of experience in teaching. BSc MSc Bed
Online Classes Online Classes

Rinky Awasthi Educationist CEO Teaching is my PASSION. I am handing students online as well as offline. My role is to impart knowledge and push students in a very lovable way to score good marks. I emphasis more on concept clearance. At times I am both strict & soft depending upon the circumstances. On regular basis I take exams. I am teacher but try to be friendly with students so that I can know their weak areas. Moreover I am touch with parents too so that on regular basis I could send growth chart to parents. Result OF 2022-2023 Science Class X Result 2023 Shanaya Bali 100 Abhinandan Mishra 98 Avani 97 Tarini Dasgupta 95 Ruben Dey 94 Shaza 94 Shreya Erangapurath 91 Janya Arora 90 Nina 85 Pari Sharma 84 Chemistry XII Result 2023 1) Ishaan Pandey 97 2) Priyanka Sharma 96 3) Animesh Tyagi 94 4) Sara Gupta 94 5) Isha Narula 92 6) Aman Jain 90 7) Divyanshi 87 8) Yusra Khan 86 9) Musa Abidi 84 Biology XII Result 2023 1) Isha Narula 98 2) Divyanshi 97 3) Ishaan Pandey 95 4) Adarsh Meher 94 5) Priyanka Sharma 94 6) Sara Gupta 92 7) Shweta 89 8) Prisha 85 NEET Batch 2023 1) Sara Gupta 2)Divyanshi 3) Prisha 4)Ishaan Pandey 5)Adarsh Meher 6)Shweta 7)Priyanka Sharma 8)Isha Narula Result speaks -sharing my Term 1 result of 2021-2022 Proud of my Students Term 1 Result Class X Aaryaman 40/40 Yashita 40/40 Kaushika 39/40 Siddharth 38/40 Nandani 35.5/40 Pranit 34/40 Shashwat 34/40 Aryaan 28/40 Term 1 Result Class Biology XII Gauri 34/35 Yashasvi 34/35 Shreya 34/35 Suhani shah 33/35 Tarun 33/35 Kavita 33/35 Term 1 Result Class Chemistry XII Gauri 35/35 Yashasvi 35/35 Shreya 34/35 Suhani shah 34/35 Tarun 34/35 Kavita 33/35 I teach in very friendly manner. Concept clearance is my priority. On regular basis I take test. Take demo and feels the difference. MY WORK SPEAKS I am result oriented. My methodology of teaching is such that students learn to deal with any type of situation. Grooming while studying is my funda.

Smita Jaiswal

Mam is so good, she is nice person also. Her teaching like awesome.

Skills: Chemistry , Biology
Also teaches: Class 11 Tuition, Class 9 Tuition and more

(20)
Top Tutor
locationImg Sector 10, Dwarka, Delhi
experience 6 yrs of Exp students 5 students
greenClock 535 hrs of classes completed
rsIcon 480 per hour
English Tutor with 8 years experience
Online Classes Online Classes

I am (English Educator). I've been teaching for more than 8 years. My background includes planning and teaching English to children as well as adults. I have worked with UNACADEMY, Chandigarh University, Mahendras and many more institutions. I got certified as a Meet & Greet officer, conforming to National Skill Qualifications Framework Level-4. Two times winner in Declamation contest at the college level

Skills: English

(7)
Top Tutor
locationImg Sarv Suvidha Nagar, Indore
experience 1 yrs of Exp students 3 students
greenClock 178 hrs of classes completed
rsIcon 350 per hour
Experienced SST AND ECONOMICS Faculty (Ex-Physics Wallah) AI-Powered Learning for Better Results
Online Classes Online Classes

I am an AI-enabled Social Science educator with experience teaching Grades 6–10 at Physics Wallah. I specialize in simplifying complex concepts through visual PPT-based learning, storytelling, and engaging teaching methods. With a strong focus on conceptual clarity and student engagement, I also integrate AI tools to create modern, effective learning experiences. My goal is to make Social Science easy, interesting, and relatable for every student.

Prajval Dogra

Very Good experience.

Skills: Economics
Also teaches: Class 8 Tuition, Class 9 Tuition and more

Other Subjects in CBSE - Class 12

Worksheet Icon

Download free CBSE - Class 12 Biology Evolution EXERCISES worksheets

Download Now

Find Best Class 12 Tuition ?

Find Now »