Biology : Evolution Of Plants And Animals

Q 7 / 10

UPSC CSE Prelims 2003

Consider the following statements:

  1. The common blue green algae, Spirogyra and Ulothrix, are found n both fresh water ponds and oceans.
  2. The Chameleon can look ahead with one eye, and at the same time look behind with another.

Which of these statements is/are correct?

EXPLANATION

Correct Option

Statement 2 is correct.

  • Chameleons possess the unique physiological ability to move their eyes independently of each other. This allows one eye to focus on an object in front while the other simultaneously scans a different area, such as behind or to the side.
  • This independent eye movement provides chameleons with a wide, panoramic field of vision, which is a significant evolutionary advantage for both detecting prey and avoiding predators.

Incorrect Options

Statement 1 is incorrect.

  • Spirogyra and Ulothrix are classified as green algae (Chlorophyta), not blue-green algae (Cyanobacteria). Green algae are eukaryotic organisms.
  • Blue-green algae, or cyanobacteria, are prokaryotic organisms.
  • Additionally, Spirogyra and Ulothrix are predominantly found in freshwater environments, such as ponds, lakes, and streams, and are not typically found in marine (oceanic) habitats.
SOURCENCERT Class 11 Biology, Chapter 3: Plant Kingdom, Chapter 4: Animal Kingdom