The animal that has a notochord throughout its life is: MCQ with Answer and Explanation

The animal that has a notochord throughout its life is:
A. Lizard
B. Frog
C. Amphioxus
D. Human
Answer: Option C
Solution (By JKSSB Mock Tests)
Amphioxus (Branchiostoma) is a cephalochordate that retains the notochord, dorsal nerve cord, and pharyngeal slits throughout its life. In vertebrates, the notochord is largely replaced by the vertebral column during development. Amphioxus is a key model for studying vertebrate origins.

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Practice More Biology Questions

Question #1
The element that is a constituent of the amino acids methionine and cysteine is:
A. Iron
B. Nitrogen
C. Phosphorus
D. Sulfur

Correct Answer: Option D


Explanation:
Sulfur is present in the amino acids methionine and cysteine (which forms disulfide bonds in proteins). Nitrogen is in all amino acids, phosphorus in nucleic acids and ATP, iron in heme. Sulfur is also in vitamins biotin and thiamine. Disulfide bonds are crucial for protein tertiary structure.

This question belongs to: Science Biology
Question #2
The ultimate source of energy for all ecosystems is:
A. Water
B. Geothermal heat
C. Wind
D. Sun

Correct Answer: Option D


Explanation:
Solar energy is captured by photosynthetic autotrophs and converted to chemical energy, which then flows through food chains. Except for deep-sea hydrothermal vents relying on chemosynthesis, the sun powers virtually all life on Earth.

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Question #3
Bile juice is secreted by the:
A. Gall bladder
B. Duodenum
C. Pancreas
D. Liver

Correct Answer: Option D


Explanation:
Bile juice is continuously secreted by the liver. It is stored and concentrated in the gall bladder and released into the duodenum (first part of the small intestine) when food enters. Bile contains bile salts (like bilirubin and biliverdin) which are crucial for the emulsification of fats, breaking them into smaller micelles for easier digestion by lipases.

This question belongs to: Science Biology