plant kingdom Flashcards
In which phylum do the adults exhibit radial symmetry and larva exhibit bilateral symmetry?
Echinodermata
Diploblastic Animals
Diploblastic animals are those in which cells are arranged in two embryonic layers, internal endoderm, external ectoderm. For eg., coelenterates.
Triploblastic Animals
While triploblastic animals are those that have a mesoderm along with the ectoderm and endoderm. For eg., chordates
Blood filled cavity in arthropods
Haemocoel
Free-floating form of Cnidaria
Medusa
Lateral appendages in aquatic annelids
Parapodia
A stinging organ of jellyfish
Nematocytes
Mention the role of the radula in Molluscs.
The radula helps in scraping and scratching the food and creates depressions in the rocks. Molluscs use rocks as their habitat.
What do you understand by metagenesis? Give an example.
Metagenesis is the phenomenon in which one generation of plants and animals reproduces asexually followed by sexually reproducing generation. For eg., Coelenterates.
What is bioluminescence? Give an example.
The production and emission of light by a living organism is known as bioluminescence. It is widely seen in marine animals, in some fungi, and a few terrestrial invertebrates. Jellyfish and fireflies exhibit this phenomenon.
What are triploblastic animals?
Animals with three germ layers- the ectoderm, mesoderm, and endoderm are called triploblastic animals. All multicellular animals including Molluscs, worms, arthropods, Echinodermata and vertebrates are examples of triploblastic animals.
What is mesoglea? Where is it found?
Mesoglea is an undifferentiated layer present in between ectoderm and endoderm. It is found in Coelenterates.
Name the arthropod which is an (i) Living fossil, (ii) Gregarious pest.
(i) Living fossil: - Limulus (King crab),
(ii) Gregarious pest: - Locusta (Locust).
Free-living Platyhelminthes
Planaria (Freshwater flatworm)
Parasitic Platyhelminthes
Taenia (Tapeworms)
