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To solve the quadratic equation \( x^2 + 5x + 6 = 0 \), we can use the factoring method. Here are the steps:

### Step 1: Identify the Equation
The equation we are working with is 

\[
x^2 + 5x + 6 = 0
\]

### Step 2: Factor the Quadratic
We need to factor the quadratic expression on the left side. We look for two numbers that multiply to the constant term (6) and add up to the coefficient of the linear term (5). The two numbers that satisfy these conditions are:

- The numbers 2 and 3.

### Step 3: Rewrite the Equation
We can now rewrite the quadratic in its factored form:

\[
(x + 2)(x + 3) = 0
\]

### Step 4: Apply the Zero Product Property
According to the Zero Product Property, if the product of two factors is zero, then at least one of the factors must be zero. Therefore, we set each factor equal to zero:

1. \( x + 2 = 0 \)
2. \( x + 3 = 0 \)

### Step 5: Solve for x
Let's solve each equation separately:

1. For \( x + 2 = 0 \):
   \[
   x = -2
   \]

2. For \( x + 3 = 0 \):
   \[
   x = -3
   \]

### Step 6: State the Solutions
The solutions to the equation \( x^2 + 5x + 6 = 0 \) are:

\[
x = -2 \quad \text{and} \quad x = -3
\]

### Conclusion
Therefore, the solutions to the quadratic equation \( x^2 + 5x + 6 = 0 \) are \( x = -2 \) and \( x = -3 \).

[START_REASONING]Okay, the user asked for 10 JAMB-style Biology questions with answers and explanations. Let me start by recalling what JAMB exams are like. JAMB is the Joint Admissions and Matriculation Board in Nigeria, and their Biology questions typically cover a wide range of topics from past syllabi. They often test both knowledge and application.

First, I need to ensure the questions are relevant to the JAMB syllabus. Let me check the key areas: cells, genetics, ecology, reproduction, physiology, etc. Each question should have a clear stem, four options, and an explanation. The explanations are crucial for understanding.

Let me brainstorm topics. Photosynthesis is a common topic. Maybe start with a question on the site of light reaction. The answer would be granum, but some might confuse it with stroma. Another question could be on blood cells, like which is responsible for antibodies – that's lymphocytes. 

Genetics questions are popular. A monohybrid cross with a 3:1 ratio indicates a heterozygous cross. For ecology, a symbiotic relationship where both benefit is mutualism. 

Reproduction in plants: the part that develops into a seed after fertilization is the ovule. Enzymes: ptyalin in saliva acts on starch. 

Taxonomy: organisms in the same class but different families would be in the same phylum. Homeostasis: the organ responsible for excretion and osmoregulation is the kidney. 

Plant hormones: abscisic acid is responsible for dormancy. Circulatory system: the chamber with the thickest wall is the left ventricle. 

Wait, need to make sure the questions aren't too easy or too hard. Also, check for accuracy. For example, in the mutualism question, clownfish and sea anemone is a classic example. 

Let me structure each question with the format: Question, Options (A-D), Answer, Explanation. Number them 1 to 10. Ensure explanations are concise but informative. 

Double-check answers to avoid mistakes. For instance, the enzyme ptyalin is indeed in saliva and breaks down starch. Left ventricle has the thickest muscle for pumping blood to the body. 

Make sure the topics are varied across the Biology syllabus. Include botany, zoology, human biology, ecology, etc. That should cover a good range. 

Once all questions are drafted, review each one for clarity and correctness. Ensure explanations address why the correct answer is right and why others are wrong. For example, in the ovule question, explain that after fertilization, the ovule becomes the seed and the ovary becomes the fruit. 

Alright, time to compile them neatly, using bold for the answer and clear separation between each section. Avoid markdown as per the user's request. Keep the language simple and straightforward, suitable for high school students preparing for JAMB.[END_REASONING]

Here are 10 JAMB-style Biology questions with answers and explanations:

---

**1. Which of the following is the site of the light-dependent reaction in photosynthesis?**  
A. Stroma  
B. Granum  
C. Cytoplasm  
D. Mitochondrion  

**Answer:** B (Granum)  
**Explanation:** The granum (stack of thylakoids in chloroplasts) contains chlorophyll and is where light-dependent reactions occur. The stroma (A) is where light-independent reactions take place.

---

**2. A red blood cell placed in a hypertonic solution will likely:**  
A. Burst  
B. Shrink  
C. Remain unchanged  
D. Divide  

**Answer:** B (Shrink)  
**Explanation:** In a hypertonic solution, water moves out of the cell via osmosis, causing the cell to shrink (crenation). In hypotonic solutions, cells burst (A).

---

**3. In a monohybrid cross, the F2 generation shows a phenotypic ratio of 3:1. This indicates that the parents were:**  
A. Homozygous recessive  
B. Homozygous dominant  
C. Heterozygous  
D. Mutants  

**Answer:** C (Heterozygous)  
**Explanation:** A 3:1 phenotypic ratio arises when two heterozygous parents (e.g., Tt × Tt) are crossed. Homozygous parents (A or B) would produce a 1:0 or 1:2:1 ratio.

---

**4. Which of the following is a symbiotic relationship where both organisms benefit?**  
A. Parasitism  
B. Commensalism  
C. Mutualism  
D. Predation  

**Answer:** C (Mutualism)  
**Explanation:** Mutualism involves both organisms benefiting (e.g., bees and flowers). Parasitism (A) benefits one organism at the expense of the other.

---

**5. The part of a flower that develops into a seed after fertilization is the:**  
A. Ovary  
B. Ovule  
C. Style  
D. Stigma  

**Answer:** B (Ovule)  
**Explanation:** After fertilization, the ovule becomes the seed, while the ovary (A) develops into the fruit.

---

**6. Which enzyme is present in saliva and acts on starch?**  
A. Pepsin  
B. Amylase  
C. Lipase  
D. Trypsin  

**Answer:** B (Amylase)  
**Explanation:** Salivary amylase breaks down starch into maltose. Pepsin (A) and trypsin (D) are proteases, while lipase (C) digests fats.

---

**7. Organisms in the same class but different families belong to the same:**  
A. Order  
B. Genus  
C. Phylum  
D. Species  

**Answer:** C (Phylum)  
**Explanation:** Taxonomic hierarchy: Kingdom → Phylum → Class → Order → Family → Genus → Species. Organisms in the same class share the same phylum.

---

**8. The organ responsible for osmoregulation and excretion in humans is the:**  
A. Liver  
B. Kidney  
C. Skin  
D. Pancreas  

**Answer:** B (Kidney)  
**Explanation:** The kidney filters blood, removes waste (excretion), and regulates water balance (osmoregulation). The liver (A) detoxifies but doesn’t excrete.

---

**9. Which plant hormone is responsible for inducing dormancy in seeds?**  
A. Auxin  
B. Gibberellin  
C. Abscisic acid  
D. Cytokinin  

**Answer:** C (Abscisic acid)  
**Explanation:** Abscisic acid inhibits growth and induces dormancy. Gibberellins (B) promote germination, while auxins (A) aid cell elongation.

---

**10. In the mammalian circulatory system, which chamber has the thickest muscular wall?**  
A. Right atrium  
B. Left atrium  
C. Right ventricle  
D. Left ventricle  

**Answer:** D (Left ventricle)  
**Explanation:** The left ventricle pumps oxygenated blood to the entire body, requiring a thicker muscular wall to generate higher pressure.

---

These questions cover key topics in the JAMB Biology syllabus, including cell biology, genetics, ecology, physiology, and taxonomy. Explanations reinforce understanding of concepts and common exam pitfalls.