Passage Reference: Now let's talk about the outer part of the egg - the shell It is a hard, protective coating of the egg. It is semi-permeable; it lets gas exchange occur, but keeps other substances from entering the egg. The shell is made of calcium carbonate and is covered with as many as 17,000 tiny pores.

Common Mistake: Some students write albumin because it surrounds the yolk, but albumin is inside the shell. This is a context shift trap.

Paraphrasing: Passage: 'hard, protective coating of the egg' = Diagram: 'outer part of the egg'

Tips: For diagrams, always ask yourself which part is outer and which is inside.

Key Vocabulary:

• protective = keeps safe
• coating = outer layer

Question Focus: Identifying the small white spot on the yolk in the diagram

Correct Answer: germinal disc

Passage Reference: And last but not least, let's look at the germinal disc. It's a small, circular, white spot (2-3 mm across) on the surface of the yolk; it is where the sperm enters the egg.

Why this is correct: The diagram points to a small spot on the surface of the yolk. The passage describes this exact feature as the germinal disc, where the sperm enters the egg.

Common Mistake: Students sometimes write embryo, but the embryo develops later from this disc. That adds information not shown. This is a partial truth trap.

Paraphrasing: Passage: 'small, circular, white spot on the surface of the yolk' = Diagram: 'small spot on yolk'

Tips: Small details in diagrams often match very specific terms in the passage.

Key Vocabulary:

• disc = flat round area
• germinal = related to reproduction

Question Focus: Identifying the rope-like structure holding the yolk

Correct Answer: chalaza

Passage Reference: Yolk is anchored by chalaza - a spiral, rope-like strand that anchors the yolk in the thick egg white. There are two chalazae anchoring each yolk; one on the top and one on the bottom.

Why this is correct: The diagram shows a twisted strand attached to the yolk. The passage says the yolk is anchored by chalaza, described as a rope-like strand.

Common Mistake: Some students write albumin, but albumin is the egg white, not the rope-like strand. This is a context shift trap.

Paraphrasing: Passage: 'rope-like strand that anchors the yolk' = Diagram: 'twisted structure holding yolk'

Tips: Shape clues in diagrams like twisted or rope-like are very important.

Key Vocabulary:

• anchor = hold in place
• strand = thin piece

Question Focus: Identifying the thick white part surrounding the yolk

Correct Answer: albumin

Passage Reference: Another very important part of the egg is the albumin, which is the inner thick white part of the egg. This part of the egg is a excellent source of riboflavin and protein. In high-quality eggs, the inner thick albumen stands higher and spreads less than thin white. In low-quality eggs, it appears thin white.

Why this is correct: The diagram label points to the white area around the yolk. The passage clearly calls this part the albumin, the inner thick white part of the egg.

Common Mistake: Writing egg white instead of albumin is wrong because you must copy the exact passage word. This is a synonym trap.

Paraphrasing: Passage: 'inner thick white part of the egg' = Diagram: 'white area around yolk'

Tips: Even if you know a common word, always use the scientific term from the passage.

Key Vocabulary:

• albumin = egg white
• inner = inside

Question Focus: Identifying the yellow central part of the egg

Correct Answer: yolk

Passage Reference: One of the main parts of the egg is yolk - the yellow, inner part of the egg where the embryo will form.

Why this is correct: The diagram label clearly points to the yellow center of the egg. The passage defines this part as the yolk, the yellow inner part where the embryo forms.

Common Mistake: Some students overthink and write embryo, but the embryo forms inside the yolk. This is a context shift trap.

Paraphrasing: Passage: 'yellow, inner part of the egg' = Diagram: 'yellow center'

Tips: Central position in a diagram often matches key definitions early in the passage.

Key Vocabulary:

• inner = inside
• embryo = developing baby animal

Question Focus: Identifying the air space at the larger end of the egg

Correct Answer: air cell

Passage Reference: Air cell is an air space that forms when the contents of the egg cool and contract after the egg is laid. The air cell usually rests between the outer and inner membranes at the eggs larger end. As the egg ages, moisture and carbon dioxide leave through the pores of the shell, air enters to replace them and the air cell becomes larger.

Why this is correct: The diagram points to an empty space at one end of the egg. The passage explains this is the air cell, an air space that forms after the egg is laid.

Common Mistake: Students sometimes write membrane, but the air cell is the space between membranes. This is a partial truth trap.

Paraphrasing: Passage: 'air space that forms' = Diagram: 'empty space'

Tips: Spaces or gaps in diagrams usually match words like 'air' or 'space' in the passage.

Key Vocabulary:

• contract = become smaller
• moisture = water

General Tips:

• Diagram questions follow passage order - use the passage sections to guide you.
• Always copy the exact word from the passage. Do not use your own synonym.
• Check the word limit carefully. Two words means exactly one or two, never three.
• Look at shapes and positions in the diagram and match them to descriptions in the text.