The process of water loss as vapor from leaves is: MCQ with Answer and Explanation

The process of water loss as vapor from leaves is:
A. Transpiration
B. Evaporation
C. Guttation
D. Translocation
Answer: Option A
Solution (By JKSSB Mock Tests)
Transpiration mainly occurs through stomata and drives the transpiration pull for water movement. Guttation is liquid loss, evaporation from free surface.

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Practice More Biology Questions

Question #1
The pigment that gives blue-green algae their color is:
A. Chlorophyll b
B. Fucoxanthin
C. Phycoerythrin
D. Chlorophyll a and phycocyanin

Correct Answer: Option D


Explanation:
Cyanobacteria (blue-green algae) contain chlorophyll a and phycobilins, mainly phycocyanin (blue) and phycoerythrin (red), hence blue-green color.

This question belongs to: Science Biology
Question #2
The 'pUC19' plasmid is a widely used cloning vector. A key feature of pUC19 that facilitates the selection of recombinant clones is the presence of:
A. Multiple origins of replication
B. The lacZ gene for alpha-complementation (blue-white screening)
C. Genes for nitrogen fixation
D. The rop gene for replication control

Correct Answer: Option B


Explanation:
pUC19 is a small, high-copy-number cloning vector. A crucial feature for selecting recombinant clones is the presence of the lacZ' gene, which codes for the alpha-peptide of beta-galactosidase. The multiple cloning site (MCS) is located within this lacZ' gene. When foreign DNA is inserted into the MCS, it disrupts the lacZ' gene (insertional inactivation). On media containing X-gal and IPTG, colonies with empty vectors turn blue, while colonies with recombinant plasmids (disrupted lacZ') remain white, allowing easy visual selection.

This question belongs to: Science Biology
Question #3
Consider statements about vitamins: 1. Vitamin A is stored in the liver. 2. Vitamin B complex is water-soluble. 3. Excess Vitamin D is easily excreted. Which are correct?
A. 1 and 3 only
B. 2 and 3 only
C. 1 and 2 only
D. 1, 2 and 3

Correct Answer: Option C


Explanation:
Vitamin A is a fat-soluble vitamin stored primarily in the liver, and excess can lead to toxicity. The B-complex vitamins are water-soluble and generally not stored in the body in significant amounts. Fat-soluble vitamins (A, D, E, K) are stored in body fat and liver, making excess Vitamin D difficult to excrete, potentially causing hypervitaminosis D. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology