The term 'cell' was coined by: MCQ with Answer and Explanation

Question
The term 'cell' was coined by:
A. Rudolf Virchow
B. Antonie van Leeuwenhoek
C. Robert Brown
D. Robert Hooke
Answer: Option D
Solution (By JKSSB Mock Tests)
Robert Hooke observed thin slices of cork under a microscope he designed and saw honeycomb-like compartments which he termed 'cells' in his 1665 book 'Micrographia'. Leeuwenhoek discovered living cells (bacteria, protozoa). Brown discovered the nucleus (1831), and Virchow proposed that all cells arise from pre-existing cells (1855). Hooke's cells were dead, empty cell walls of cork.
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Question #1
The hormone that stimulates the thyroid gland to release T₃ and T₄ is:
A. ACTH
B. FSH
C. TSH
D. LH
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Correct Answer: Option C

Explanation:
Thyroid-stimulating hormone (TSH) from the anterior pituitary binds to receptors on thyroid follicular cells, stimulating synthesis and release of thyroid hormones (T₃ and T₄). ACTH targets adrenal cortex.
This question belongs to: Science Biology
Question #2
Which of the following tissues provides mechanical strength and flexibility to plant organs?
A. Parenchyma
B. Xylem
C. Sclerenchyma
D. Collenchyma
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Correct Answer: Option D

Explanation:
Collenchyma is a simple permanent tissue with living cells, unevenly thickened primary cell walls (cellulose and pectin), providing mechanical support and flexibility, especially in young stems and leaf petioles. Parenchyma is for storage and metabolism, sclerenchyma is dead, rigid with lignified walls, xylem conducts water.
This question belongs to: Science Biology
Question #3
Which part of the flower is responsible for producing pollen grains?
A. Style
B. Anther
C. Stigma
D. Ovary
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Correct Answer: Option B

Explanation:
The anther is the terminal part of the stamen (male reproductive organ) where pollen grains are produced through microsporogenesis. Stigma is the receptive surface for pollen, style connects stigma to ovary. Ovary contains ovules, which develop into seeds after fertilization. The anther has four microsporangia (pollen sacs).
This question belongs to: Science Biology
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