Very Short Question and Answers - Nutrition - Part 2

Autotrophic nutrition is where organisms produce their own food from inorganic substances (like plants through photosynthesis), while heterotrophic nutrition is where organisms obtain food by consuming other organisms (like animals and fungi).

Plants obtain carbon dioxide from the air, water from the soil, and sunlight from the sun to perform photosynthesis.

The acid in our stomach (hydrochloric acid) creates an acidic medium that facilitates the action of the enzyme pepsin for protein digestion and also protects the stomach lining.

Digestive enzymes break down complex food molecules into simpler forms that can be easily absorbed by the body.

The small intestine has numerous finger-like projections called villi that increase the surface area for absorption and are richly supplied with blood vessels to transport absorbed nutrients.

A food-vacuole is a membrane-bound compartment within a cell where food is digested; in Amoeba, it forms when the cell surrounds food and fuses to break down the complex substances into simpler ones.

Saliva moistens food, begins digestion through enzymes like salivary amylase which breaks down starch into simpler sugars, and helps in swallowing.

Cuscuta exhibits parasitic nutrition as it derives nourishment from its host plants without killing them.

Once food is ingested, gastric glands in the stomach wall secrete hydrochloric acid and pepsin to start the digestion of proteins.

Mucus secreted in the stomach lining protects it from being eroded by the gastric acid.

The muscular walls of the stomach contract and relax to churn the food, mixing it with digestive juices and breaking it down further.

Bile salts are substances secreted by the liver that emulsify fats into smaller globules, enhancing the action of enzymes for fat digestion.

Peristalsis is the rhythmic contraction of muscles in the digestive tract that propels food forward through the alimentary canal.

The pancreas secretes pancreatic juice containing enzymes like trypsin and lipase, aiding in the digestion of proteins and fats.

Dental plaque is a sticky mass of bacteria and food particles that forms on teeth; it can create acids from sugars that demineralize tooth enamel, leading to dental caries.

Herbivores have longer small intestines to help digest cellulose from plants, while carnivores have shorter intestines since meat is easier to digest.

Villi increase the surface area available for absorption of nutrients from digested food, ensuring more efficient uptake into the bloodstream.

The anal sphincter regulates the exit of waste material from the body, ensuring proper control over defecation.

Gastric juices contain hydrochloric acid and enzymes which aid in digesting food, particularly proteins, and also kill harmful bacteria.

Organisms exhibit various adaptations such as specialized mouthparts, digestive systems, and feeding behaviors tailored to their specific food sources.