Q.1.
Select the true statement regarding non-chordata:
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21%
a) A calcareous shell present in all Molluscans.
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29%
b) Calcareous Spicules are endoskeleton in echinoderms.
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38%
c) Most of the triploblastic animals are protostomes.
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13%
d) Ventral heart and dorsal nerve cord found in non – chordates.
Q.2.
Which of the following statements are true/false? (i) In open type circulatory system, the blood is pumped out of the heart and the cells and tissues are directly bathed in it. (ii) When any plane passing through the central axis of the body divides the organism into two identical halves, it is called bilateral symmetry. (iii) Those animals in which the developing embryo has a third germinal layer, mesoderm in between the ectoderm and endoderm are called triploblastic animals. (iv) The body cavity which is lined by mesoderm is called coelom.
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19%
a) (i), (ii) and (iii) are true but (iv) alone is false.
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31%
b) (i) is true and (ii), (iii) and (iv) are false.
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45%
c) (i), (iii) and (iv) are true but (ii) alone is false.
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5%
d) (i) and (iv) are true but (ii) and (iii) are false.
Q.3.
The figures (i) – (iv) shows four animals. Identify the animals and their larval forms and select the correct option given below:
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26%
a) (i) – Taenia → Miracidium larva; (ii) – Aurelia → Planula larva; (iii) – Loligo → Tornaria larva; (iv) – Balanoglossus → Veliger larva.
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35%
b) (i) – Taenia → Cystericus larva; (ii) – Aurelia → Planula larva; (iii) – Octopus → Larva absent; (iv) – Balanoglossus → Tornaria larva
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24%
c) (i) – Taenia → Cystericus larva; (ii) – Aurelia → Planula larva; (iii) – Sepia → Veliger larva; (iv) – Balanoglossus → Wriggler larva.
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15%
d) (i) – Taenia → Hexacanth larva; (ii) – Physalia → Cydippid larva; (iii) – Octopus → No larval form; (iv) – Balanoglossus → Tornaria larva.