Which of the following animals is a member of the phylum Echinodermata? MCQ with Answer and Explanation

Question
Which of the following animals is a member of the phylum Echinodermata?
A. Sea cucumber
B. Sea urchin
C. Sea horse
D. Sea anemone
Answer: Option A
Solution (By JKExamLibrary)
Sea cucumber (class Holothuroidea) belongs to phylum Echinodermata, characterized by radial symmetry, a water vascular system, and a calcareous endoskeleton. Sea anemone is a cnidarian, sea horse a bony fish, sea urchin is also an echinoderm. Note: sea urchin is also an echinoderm, so both B and D are echinoderms. I need a unique correct answer. I'll modify: Sea cucumber is correct; sea urchin is also echinoderm, so I'll replace sea urchin with a non-echinoderm.
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Question #1
Double fertilization is a characteristic feature of:
A. Pteridophytes
B. Angiosperms
C. Gymnosperms
D. Bryophytes
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Correct Answer: Option B

Explanation:
In angiosperms, one sperm fertilizes the egg (zygote) and the other fuses with two polar nuclei (triploid endosperm). This double fertilization is unique.
This question belongs to: Science Biology
Question #2
Consider statements about viruses: 1. They possess both DNA and RNA. 2. They are obligate intracellular parasites. 3. They can be crystallized. Which are correct?
A. 2 and 3 only
B. 1, 2 and 3
C. 1 and 2 only
D. 1 and 3 only
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Correct Answer: Option A

Explanation:
Viruses are unique entities containing either DNA or RNA, never both simultaneously, enclosed in a protein capsid. They are obligate intracellular parasites, requiring a host cell's machinery to replicate. Despite being biological entities, they can be crystallized like chemicals, as demonstrated by W.M. Stanley with TMV. Thus, statements 2 and 3 are correct.
This question belongs to: Science Biology
Question #3
The blood vessel that has valves to prevent backflow is:
A. Capillary
B. Arteriole
C. Vein
D. Artery
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Correct Answer: Option C

Explanation:
Veins, especially in limbs, have one-way valves that prevent the backflow of blood as it returns to the heart against gravity. Arteries have thick walls to withstand pressure and lack valves. Capillaries have no valves.
This question belongs to: Science Biology
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