Robert Hooke is credited with the discovery of: MCQ with Answer and Explanation

Robert Hooke is credited with the discovery of:
A. Living cells
B. Cells (in dead cork tissue)
C. Nucleus
D. Bacteria
Answer: Option B
Solution (By JKSSB Mock Tests)
Robert Hooke, an English scientist, is credited with the discovery of cells in 1665. He observed a thin slice of dead cork tissue from an oak tree under a primitive compound microscope. He saw a honeycomb-like structure of small compartments, which he called 'cells' (from the Latin 'cella', meaning small room). He was actually observing the non-living cell walls of dead plant cells.

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Practice More Biology Questions

Question #1
The natural place of an organism where it lives and reproduces is called its:
A. Habitat
B. Biome
C. Ecosystem
D. Niche

Correct Answer: Option A


Explanation:
Habitat refers to the physical environment where an organism lives (address), whereas niche refers to its functional role in the ecosystem (profession), including interactions and resource use. Ecosystem is the community plus abiotic factors, biome is a large ecological area with similar climate and vegetation. A pond habitat can have various niches.

This question belongs to: Science Biology
Question #2
The tissue responsible for the transport of water in plants is:
A. Epidermis
B. Phloem
C. Xylem
D. Collenchyma

Correct Answer: Option C


Explanation:
Xylem is a complex permanent tissue that conducts water and dissolved minerals from roots to the aerial parts. It consists of tracheids, vessels, xylem parenchyma, and fibers. Phloem transports organic solutes, collenchyma provides flexible support, epidermis protects.

This question belongs to: Science Biology
Question #3
Which radioactive isotope is commonly used for dating relatively recent fossils (up to about 50,000 years old)?
A. Uranium-238
B. Rubidium-87
C. Potassium-40
D. Carbon-14

Correct Answer: Option D


Explanation:
Carbon-14 (radiocarbon) dating is used to determine the age of organic materials up to about 50,000 to 60,000 years old. Living organisms absorb Carbon-14 from the atmosphere. When they die, absorption stops, and the Carbon-14 decays at a known rate (half-life of 5,730 years). By measuring the remaining Carbon-14, the age of the fossil can be calculated.

This question belongs to: Science Biology