Explanation

• The evaporation of water from the leaves, also known as transpiration, creates a negative pressure that pulls water up the xylem from the roots to the leaves.
• This process is known as the transpiration-cohesion theory.

Explanation

• Phloem is the vascular tissue responsible for transporting organic materials, such as sugars, amino acids, and other nutrients.
• Produced by photosynthesis from the leaves to the rest of the plant, including roots, stems, and fruits.

Explanation

• Bile salts are produced by the liver and stored in the gallbladder.
• They are released into the duodenum (the first part of the small intestine) to facilitate fat digestion.

Explanation

• Red meat is a good source of protein and other nutrients.
• It is not a significant source of calcium.

Explanation

The pharynx (throat) is a shared passage for both the respiratory and digestive systems.

The trachea (windpipe) and esophagus both connect to the pharynx:

• The trachea connects to the pharynx anteriorly (front) and leads to the lungs.
• The esophagus connects to the pharynx posteriorly (back) and leads to the stomach.

Explanation

• Pepsin is a proteolytic enzyme produced by the chief cells in the stomach lining.
• It breaks down proteins into smaller peptides and amino acids, initiating protein digestion in the acidic environment of the stomach.

Explanation

Vitamin A is essential for the production of rhodopsin, the visual pigment in the retina that allows us to see in low light conditions.

Explanation

• Animals that migrate long distances need a compact and energy-dense source of fuel to sustain them during their journey.
• Fat is the most energy-dense nutrient, providing approximately 9 kcal/g, compared to carbohydrates (4 kcal/g) and protein (4 kcal/g).

Explanation

Kwashiorkor is a condition caused by a deficiency of dietary protein, leading to an imbalance in the gastro-intestinal system. It is characterized by:

• Edema (swelling) in the legs, feet, and face
• Diarrhea
• Weight loss
• Hair loss
• Skin lesions
• Impaired immune function

Explanation

• The period of rapid growth and development is called adolescence.
• This stage typically involves significant physical, emotional, and cognitive changes as individuals transition from childhood to adulthood.