Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered living microorganisms. 3. Charles Darwin proposed the cell theory. Which are correct? MCQ with Answer and Explanation

Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered living microorganisms. 3. Charles Darwin proposed the cell theory. Which are correct?
A. 1, 2 and 3
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 2 only
Answer: Option D
Solution (By JKExamLibrary)
Robert Hooke, in his 1665 book 'Micrographia', described observing dead cork tissue under a microscope and coined the term 'cell' for the small, box-like compartments he saw. Antonie van Leeuwenhoek, using his superior handcrafted single-lens microscopes in the 1670s, was the first person to observe and describe living, single-celled microorganisms, which he called 'animalcules'. Charles Darwin proposed the theory of evolution by natural selection; the cell theory was proposed by Schleiden and Schwann. Thus, statements 1 and 2 are correct.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Biology Questions

Question #1
The protein that carries oxygen in muscles is:
A. Hemoglobin
B. Transferrin
C. Myoglobin
D. Ferritin

Correct Answer: Option C


Explanation:
Myoglobin is an oxygen-binding protein in muscle cells, containing a single heme group. It has a higher affinity for oxygen than hemoglobin, facilitating oxygen diffusion and storage in muscles. Hemoglobin is in blood, ferritin stores iron, transferrin transports iron.

This question belongs to: Science Biology
Question #2
Which of the following statements about protein structure is correct?
A. Denaturation breaks peptide bonds.
B. The primary structure is the overall 3D shape.
C. The secondary structure includes alpha helices and beta sheets.
D. Disulfide bonds are part of the secondary structure.

Correct Answer: Option C


Explanation:
Secondary structure refers to local folding patterns like α-helices and β-sheets. Primary is amino acid sequence; tertiary is 3D folding; disulfide bonds are tertiary/quaternary; denaturation disrupts non-covalent bonds, not peptide bonds.

This question belongs to: Science Biology
Question #3
The structure that prevents backflow of blood from the left ventricle to the left atrium is the:
A. Pulmonary valve
B. Mitral valve
C. Aortic valve
D. Tricuspid valve

Correct Answer: Option B


Explanation:
The bicuspid (mitral) valve has two cusps and closes during ventricular systole to prevent regurgitation into the left atrium. The tricuspid valve is on the right.

This question belongs to: Science Biology