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प्रश्न
Differentiate between direct development and Indirect development
उत्तर
| Direct development | Indirect development |
| When the young one is a look-alike of an adult animal, it is called direct development. | When the offspring differs from the adult animal, it is termed Indirect development. |
| E.g. frog, cockroach, silkworm, etc. | E.g. birds, mammals, reptiles, etc. |
संबंधित प्रश्न
Arthropoda : Largest phylum : : Mollusca : ______________
Ctenidia are respiratory organs in ______.
State whether true or false. If false, correct the statement.
Bipinnaria is the larva of Mollusca.
The animals belonging to phylum ______ are said to be soft-bodied.
The name ______ means “a thousand legs”.
Cuttlefish is a member of this phylum:
Phylum molluscs can be distinguished from other invertebrates by the presence of
Mention one example each for animals with chitinous exoskeleton and those covered by a calcareous shell.
What is the role of radula in molluscs?
Match the following and write correct choice in space provided
| Animal | Characteristics |
| a. Pila | i. Jointed appendages |
| b. Cockroach | ii. Perching |
| c. Asterias | iii. Water vascular system |
| d. Torpedo | iv. Electric organ |
| e. Parrot | v. Presence of shell |
| f. Dog fish | vi. Placoid scales |
a. ______, b. ______, c. ______
d. ______, e. ______, f. ______
