Consider statements about plant biology: 1. Xylem transports water. 2. Phloem transports food. 3. Cambium is responsible for primary growth. Which are correct? MCQ with Answer and Explanation

Consider statements about plant biology: 1. Xylem transports water. 2. Phloem transports food. 3. Cambium is responsible for primary growth. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only
Answer: Option C
Solution (By JKExamLibrary)
Xylem is the vascular tissue responsible for the unidirectional upward transport of water and dissolved minerals from the roots to the aerial parts of the plant. Phloem is the vascular tissue responsible for the translocation of organic nutrients (primarily sucrose) from sources to sinks, which can be bidirectional. Cambium (vascular and cork) is a lateral meristem responsible for secondary growth (increase in girth); primary growth (increase in length) is driven by apical meristems. Thus, statements 1 and 2 are correct.

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Question #1
Consider statements about scientists: 1. Robert Hooke coined the term 'cell'. 2. Antonie van Leeuwenhoek discovered the cell nucleus. 3. Matthias Schleiden proposed that all plants are made of cells. Which are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1 and 2 only
D. 1, 2 and 3

Correct Answer: Option B


Explanation:
Robert Hooke observed cork tissue in 1665 and coined the term 'cell' to describe the box-like structures. Matthias Schleiden, a botanist, concluded in 1838 that all plants are composed of cells, forming a core tenet of the cell theory. The cell nucleus was discovered by Robert Brown in 1831, not Antonie van Leeuwenhoek, who is famous for discovering living microorganisms. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #2
The technique used to study the internal structures of cells using electron beams is:
A. Chromatography
B. Electron microscopy
C. Light microscopy
D. Spectrophotometry

Correct Answer: Option B


Explanation:
Electron microscopes use beams of electrons to achieve much higher resolution than light microscopes, enabling visualization of organelles and macromolecular complexes. Types include TEM (internal) and SEM (surface). Light microscopes use visible light, spectrophotometry measures absorbance, chromatography separates.

This question belongs to: Science Biology
Question #3
The disease caused by the bacterium Vibrio cholerae is characterized by:
A. Severe watery diarrhea (rice-water stools)
B. Persistent cough
C. High fever and rash
D. Bloody diarrhea

Correct Answer: Option A


Explanation:
Cholera, caused by Vibrio cholerae, produces cholera toxin that stimulates massive secretion of water and electrolytes into the intestinal lumen, leading to profuse, watery diarrhea resembling rice water, causing rapid dehydration. Treatment is oral rehydration therapy and antibiotics. Typhoid causes fever, dysentery causes bloody stools.

This question belongs to: Science Biology