PROTEROTOIC Ediacaran Sponges Cnidarians Echinoderms Chordat

PROTEROTOIC Ediacaran Sponges Cnidarians Echinoderms Chordates Brachiopods Annelids Molluscs Arthropods PALEOZOIC Cambrian

Solution

1.Correct option- D) A and C are both true

Explanation- Fungi use cellulose and lignin for their nutrition by decomposing organic matters. Thus they can play very important role in ecosystem.

Fungi are also used in food industry. They help in fermentation to produce Soy sauce, Aspergillus oryzae & Saccharomyces rouxii are used. Penicillium camemberti & Penicillium roquefortii are used for cheese production.

2. Correct option- E) All of the above

Explanation- Humans(chordate) and Cnidarians are very distantly related. The only common feature among them is tissue differentiation. Echinoderms, Molluscs, Annelids, Arthropods all have the tissue differentiation feature. So it can be said that common ancestor of Humans and Cnidarians gave rise to all of them.

3. Correct option- B) Echinoderms and Cnidarians

Explanation- Echinoderms are known for their pentamerous radial symmetry. Cnidarians also have radial symmetry.

But the two valves of brachiopods are quite different. So, they don’t have radial symmetry.

4. Correct option- A) When a phylogeny based on DNA and a phylogeny based on morphology aren’t the same, the molecular phylogeny is always more correct

Explanation- Molecular analysis is always more perfect than visual observation of morphological features. So, molecular phylogeny is always preferable.

But for being different phylogeny we can`t deny both of the phylogeny as both of them has specific importance. Morphological phylogeny is important for early stage of classification and identification. Molecular phylogeny is important for perfect analysis.

Not all morphological features are same always. Every group of organisms have some specific unique features. So, morphological phylogeny is not same always.