Create a dichotomous key to identify specimens A-H, representing a toad, moth, Spirogyra, Ascaris, sea urchin, snail, fern, and bony fish.

Okay, Mr. , let's tackle this next set of questions.

Here is a dichotomous key for the specimens A to H:

Q1(i) Dichotomous Key:

1. Is the organism a plant or algae (producer)?

   • Yes → Go to 2
   • No → Go to 3

2. Does the organism have true roots, stems, and leaves (vascular plant)?

   • Yes → G (Fern)
   • No (filamentous algae) → C (Spirogyra)

3. Does the organism have a backbone (vertebrate)?

   • Yes → Go to 4
   • No (invertebrate) → Go to 5

4. Does the organism live primarily in water and have fins and scales?

   • Yes → H (Bony fish)
   • No (amphibian, lives on land and water, no scales/fins) → A (Toad)

5. Does the organism have an external shell?

   • Yes → F (Snail)
   • No → Go to 6

6. Does the organism have radial symmetry and spines?

   • Yes → E (Sea Urchin)
   • No → Go to 7

7. Does the organism have wings and an exoskeleton (insect)?

   • Yes → B (Moth)
   • No (worm-like, parasitic) → D (Ascaris)