. Lymph that passes through the villi picks up:
a. Minerals
b. Fat-soluble vitamins
c. Glucose
d. Water-soluble vitamins
Which of the following is NOT an Extremophile?
a. pH-tolerant archaebacteria
b. pressure-tolerant archaebacteria
c. halophiles
d. hydrophiles
e. thermophiles
The Correct Answer and Explanation is:
Here are the correct answers:
Lymph that passes through the villi picks up:
→ b. Fat-soluble vitamins
Which of the following is NOT an Extremophile?
→ d. hydrophiles
Question 1 Explanation:
The small intestine is lined with structures called villi—tiny, finger-like projections that increase the surface area for absorption. Each villus contains capillaries and a lacteal, which is a small lymphatic vessel.
When nutrients are absorbed after digestion, different nutrients enter different vessels:
- Carbohydrates and proteins are broken down into glucose and amino acids, respectively. These enter the blood capillaries.
- Fats, on the other hand, are mostly absorbed as fatty acids, monoglycerides, and fat-soluble vitamins (A, D, E, K). These are reassembled into chylomicrons (fat droplets surrounded by proteins) inside the intestinal cells and then absorbed into the lacteals (lymphatic capillaries).
So, lymph that passes through the villi carries away fat-soluble vitamins, not water-soluble ones like vitamin C or B-complex, which enter the bloodstream directly.
This distinction is crucial for understanding fat metabolism, nutrient absorption, and the role of the lymphatic system in transporting dietary lipids.
Question 2 Explanation:
Extremophiles are organisms (mostly archaea and some bacteria) that thrive in extreme environmental conditions that are typically hostile to most life forms.
Types of extremophiles include:
- Thermophiles – thrive in extremely high temperatures (e.g., hot springs).
- Halophiles – thrive in very salty environments.
- pH-tolerant archaebacteria – survive in very acidic or basic environments.
- Pressure-tolerant archaebacteria (also called barophiles) – live in high-pressure environments, such as deep ocean trenches.
Hydrophiles, on the other hand, are not extremophiles. The term simply refers to organisms or substances that have an affinity for water or can dissolve in water. This does not imply they thrive in extreme conditions. In fact, most life on Earth is hydrophilic to some degree, including humans, and it is considered normal rather than extreme.
Thus, hydrophiles are not extremophiles, making option d the correct choice for the second question.