Which among the following is an example of an invertebrate chordate? MCQ with Answer and Explanation

Question
Which among the following is an example of an invertebrate chordate?
A. Starfish
B. Cockroach
C. Amphioxus
D. Earthworm
Answer: Option C
Solution (By JKExamLibrary)
Amphioxus (Branchiostoma) is a primitive chordate possessing a notochord, dorsal nerve cord, and pharyngeal slits throughout life, but lacking a vertebral column; hence it is an invertebrate chordate. Earthworm is an annelid, cockroach an arthropod, starfish an echinoderm—all non-chordates. Vertebrate chordates include fishes, amphibians, reptiles, birds, and mammals. Amphioxus is studied for evolutionary insights into vertebrate origins.
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Question #1
The human enzyme that breaks down hydrogen peroxide in the body is found in which organelle?
A. Peroxisome
B. Lysosome
C. Golgi body
D. Nucleus
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Correct Answer: Option A

Explanation:
Peroxisomes contain catalase and other oxidases that detoxify hydrogen peroxide and other harmful substances. They also play a role in lipid metabolism. Lysosomes contain hydrolytic enzymes, Golgi modifies proteins, nucleus houses DNA. Peroxisomes are abundant in liver and kidney cells.
This question belongs to: Science Biology
Question #2
Consider statements about plant anatomy: 1. Collenchyma provides flexibility. 2. Sclerenchyma cells are dead. 3. Parenchyma stores food. Which are correct?
A. 1 and 3 only
B. 1 and 2 only
C. 1, 2 and 3
D. 2 and 3 only
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Correct Answer: Option C

Explanation:
Collenchyma cells have unevenly thickened walls, providing mechanical support and flexibility to growing plant parts like stems. Sclerenchyma consists of dead cells with heavily lignified, thick walls, providing rigid strength to plant parts. Parenchyma cells are living, thin-walled, and serve as the primary packing tissue, storing food, water, and air. All three statements are correct.
This question belongs to: Science Biology
Question #3
The bacterium that causes peptic ulcers is:
A. Vibrio cholerae
B. Salmonella enterica
C. Helicobacter pylori
D. Escherichia coli
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Correct Answer: Option C

Explanation:
Helicobacter pylori colonizes the gastric mucosa, causing chronic inflammation, peptic ulcers, and increasing the risk of gastric cancer. It survives stomach acid by secreting urease, which converts urea to ammonia, neutralizing acid. Treatment involves antibiotics and acid suppressants.
This question belongs to: Science Biology
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