Which part of the alimentary canal produces bile? A Duodenum. B Liver. C Gall bladder. D Stomach.

Here are the solutions to the questions: Question 1: Step 1: Recall the anatomy of a plant stem and leaf. Step 2: Identify the specific point where a leaf attaches to the stem. This point is called a node. The correct option is B. B) Node Question 2: Step 1: Understand the function of a contractile vacuole in single-celled organisms like Amoeba. Step 2: The contractile vacuole actively expels excess water from the cell, preventing it from bursting due to osmosis. This process is known as osmoregulation. The correct option is D. D) Osmoregulation Question 3: Step 1: Analyze the nitrogen cycle, starting from atmospheric nitrogen. Step 2: The correct sequence involves nitrogen in the air being fixed by bacteria, then absorbed by plants, which are then consumed by animals. Finally, when animals (and plants) die, decomposers return nitrogen compounds to the soil and atmosphere. The correct option is D. D) Nitrogen In the air → Bacteria fix Nitrogen → Animals get Nitrogen from plants → Animals die and decompose Question 4: Step 1: Identify the reagent used in the test. Millon's reagent is a chemical test used to detect the presence of proteins. Step 2: Recall the positive result for Millon's test. A red color indicates a positive result for proteins. The correct option is A. A) Proteins Question 5: Step 1: Recall the organs involved in digestion and their functions. Step 2: The liver is the organ responsible for producing bile, which aids in fat digestion. The gall bladder stores bile. The correct option is B. B) Liver Question 6: Step 1: Recall the layers of the human skin. Step 2: The Malpighian layer (also known as the stratum basale or basal layer) contains melanocytes, which are cells that produce the pigment melanin. The correct option is B. B) Malpighian layer Question 7: Step 1: Consider the external features of a lizard. Step 2: Lizards, like other reptiles, have scales covering their bodies. These scales provide a protective barrier against physical damage and water loss. The correct option is A. A) Scales Question 8: Step 1: Examine the provided diagram of a plant cell and identify the numbered structures. 1: Cell wall 2: Cell membrane 3: Vacuole 4: Chloroplast Step 2: Recall which organelle in a plant cell contains chlorophyll. Chloroplasts are the sites of photosynthesis and contain chlorophyll. Structure 4 points to a chloroplast. The correct option is D. D) 4 Question 9: Step 1: Recall the parts of the human eye and their functions. Step 2: The retina is the light-sensitive layer at the back of the eye that contains photoreceptor cells (rods and cones). These cells detect light and convert it into electrical signals, which are then sent to the brain to form an image. The correct option is C. C) Retina That's 2 down. 3 left today — send the next one.