The scientist who demonstrated that fermentation is caused by yeast was: MCQ with Answer and Explanation

The scientist who demonstrated that fermentation is caused by yeast was:
A. Eduard Buchner
B. Alexander Fleming
C. Antonie van Leeuwenhoek
D. Louis Pasteur
Answer: Option D
Solution (By JKSSB Mock Tests)
Louis Pasteur proved that fermentation is caused by living yeast cells, not spontaneous chemical reactions. Buchner later showed that cell-free extracts could ferment sugar, discovering enzymes. Fleming discovered penicillin, Leeuwenhoek observed microbes.

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Practice More Biology Questions

Question #1
Which of the following is a disaccharide?
A. Glucose
B. Glycogen
C. Fructose
D. Sucrose

Correct Answer: Option D


Explanation:
Sucrose (table sugar) is a disaccharide composed of glucose and fructose. Glucose and fructose are monosaccharides, glycogen is a polysaccharide. Other disaccharides include maltose and lactose.

This question belongs to: Science Biology
Question #2
Which of the following is a unique feature of plant cells compared to animal cells?
A. Presence of mitochondria
B. Presence of plastids
C. Presence of ribosomes
D. Presence of Golgi apparatus

Correct Answer: Option B


Explanation:
Plastids (chloroplasts, chromoplasts, leucoplasts) are unique to plant cells and some protists. They are involved in photosynthesis, storage, and imparting color. Mitochondria, Golgi apparatus, and ribosomes are present in both plant and animal cells. The cell wall and large central vacuole are also distinguishing features of plant cells.

This question belongs to: Science Biology
Question #3
Consider the following statements about photosynthesis:
1. C3 plants fix CO₂ directly in the Calvin cycle.
2. C4 plants have Kranz anatomy.
3. Photorespiration is higher in C4 plants.
Which of the above is/are correct?
A. 1, 2, and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only

Correct Answer: Option B


Explanation:
C3 plants use Calvin cycle directly; C4 plants have Kranz anatomy and a CO₂-concentrating mechanism. Photorespiration is negligible in C4 plants, higher in C3. Thus, 3 is incorrect.

This question belongs to: Science Biology