Which of the following features defines a clade of protostome animals? a) No tru

Question

Which of the following features defines a clade of protostome animals?

a) No true tissues
b) Two openings of the gut
c) Has three germ layers
d) Secondary gastrulation opening forms the an..us
e) Radial cleavage

Select the group of organisms that has a long-lived stage during which the cells contain two nuclei.

a) Glomeromycetes
b) Chytrids
c) Zygomycetes
d) Basidiomycetes
e) Charophytes

Which of the following clades does not have any body symmetry?

a) Mollusca
b) Cnidaria
c) Tardigrada
d) Porifera
e) Echinodermata

In a flower, diploid cells are found in

a) The petals
b) The sepals
c) The pollen
d) A and B
e) A and C

Explanation / Answer

1) Secondary gastrulation opening forms the an-us - In protostome the blastopore becomes the mouth and the secondary opening becomes the an-us during the embryo development. Whereas in dueterostome, the blastopore becomes the an-us.

2) Basidiomycetes - The dikaryons with two nuclei of basidiomycetes formed during plasmogamy are long lived, that can even last centuries. The dikaryotic mycelium are more active compared to the monokaryotic mycelium.

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