The food conducting tissue in plants, phloem, is composed of which type of cells? MCQ with Answer and Explanation

The food conducting tissue in plants, phloem, is composed of which type of cells?
A. Fibers and sclereids
B. Tracheids and vessels
C. Sieve tubes and companion cells
D. Guard cells and subsidiary cells
Answer: Option C
Solution (By JKSSB Mock Tests)
Phloem is composed of sieve tube elements, companion cells, phloem parenchyma, and phloem fibers. Sieve tubes are living cells that transport organic solutes; companion cells assist in loading and unloading. Tracheids and vessels are xylem elements. Fibers and sclereids are sclerenchyma cells. Guard cells regulate stomatal movement.

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The 'Green Revolution' in India, which led to a massive increase in wheat and rice production, was primarily led by the efforts of:
A. Both B and C
B. Norman Borlaug
C. Verghese Kurien
D. M.S. Swaminathan

Correct Answer: Option A


Explanation:
The Green Revolution in India was a period of significant agricultural transformation. Norman Borlaug, the 'father of the Green Revolution' globally, developed high-yielding, disease-resistant dwarf wheat varieties in Mexico. M.S. Swaminathan, known as the 'father of the Green Revolution in India', adapted these varieties to Indian conditions and led the scientific and administrative efforts to introduce these high-yielding varieties (along with improved irrigation and fertilizers) to Indian farmers, drastically increasing wheat and rice production.

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The chemical reaction that links amino acids together is a:
A. Reduction
B. Hydrolysis
C. Dehydration synthesis
D. Oxidation

Correct Answer: Option C


Explanation:
Peptide bond formation is a condensation (dehydration synthesis) reaction where the carboxyl group of one amino acid reacts with the amino group of another, releasing a water molecule. Hydrolysis breaks bonds by adding water. Oxidation/reduction involve electron transfer. Dehydration synthesis builds polymers.

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The finger-like projections in the small intestine that increase the surface area for absorption are:
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D. Alveoli

Correct Answer: Option B


Explanation:
Villi are microscopic finger-like projections on the inner lining of the small intestine, covered with microvilli (brush border), greatly increasing surface area for absorption of digested nutrients. Each villus contains a lacteal (lymph capillary) and blood capillaries. Alveoli are in lungs, nephrons in kidneys, cilia are hair-like projections on cells.

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