Growth and Development Practice Questions

Q: A 6-month-old child presented with diarrhea for a few days and dermatitic lesions on the hands and feet. Scalp hair was comparatively sparse. Deficiency of zinc was suspected. What is true about acrodermatitis enteropathica?

Autosomal recessive inheritance. **Explanation:** **Acrodermatitis Enteropathica (AE)** is a rare genetic disorder characterized by a severe deficiency of zinc. **1. Why Option A is correct:** AE is inherited as an **autosomal recessive** trait. It is caused by a mutation in the **SLC39A4 gene** located on chromosome 8q24.3. This gene encodes the **ZIP4 transporter protein**, which is essential for the active transport of zinc across the apical membrane of enterocytes in the duodenum and jejunum. Without functional ZIP4, dietary zinc cannot be absorbed efficiently. **2. Why other options are incorrect:** * **Option B:** The inheritance pattern is strictly recessive, not dominant. * **Option C:** AE is not "partially" cured; it is **completely reversible** with high-dose oral zinc supplementation. Clinical improvement in mood and appetite often occurs within 24–48 hours of starting treatment. * **Option D:** While the genetic defect is lifelong, the term "requires lifelong treatment" is often debated in the context of *acquired* zinc deficiency. However, in the context of this specific question, the primary focus is the **inheritance pattern**, which is a classic "high-yield" fact for AE. (Note: While patients do need ongoing zinc, the hallmark of the disease in exams is its genetic transmission). **Clinical Pearls for NEET-PG:** * **Classic Triad:** Dermatitis (periorificial and acral), Alopecia, and Diarrhea. * **Timing:** Symptoms typically appear shortly after **weaning** from breast milk to cow's milk (breast milk contains a zinc-binding ligand that aids absorption, which is absent in cow's milk). * **Lesions:** Characteristically vesiculobullous and eczematous, located around the mouth, anus, and on the hands/feet. * **Diagnosis:** Low serum zinc levels and low **alkaline phosphatase** (a zinc-dependent enzyme).

Q: A 2-year-old child presents with mental retardation, slow development, and multiple heart defects. The child has a high-pitched, cat-like cry. Physical examination reveals microcephaly, hypertelorism, micrognathia, epicanthal folds, low-set ears, and hypotonia. What karyotypic abnormality would be expected?

5p-. **Explanation:** The clinical presentation of a **high-pitched, cat-like cry** (due to laryngeal hypoplasia), microcephaly, mental retardation, and characteristic facial features (hypertelorism, epicanthal folds) is pathognomonic for **Cri-du-chat Syndrome**. 1. **Why 5p- is correct:** Cri-du-chat syndrome is caused by a **partial deletion of the short arm (p) of chromosome 5**. The severity of intellectual disability and developmental delay often correlates with the size of the deletion. The "mewing" cry typically disappears as the child grows older, making early diagnosis crucial. 2. **Why other options are incorrect:** * **22q11- (DiGeorge Syndrome/Velocardiofacial Syndrome):** Characterized by CATCH-22 (Cardiac defects, Abnormal facies, Thymic hypoplasia, Cleft palate, and Hypocalcemia). It does not feature the characteristic cat-like cry. * **45,XO (Turner Syndrome):** Presents in females with short stature, webbed neck, cubitus valgus, and streak ovaries. It is not associated with microcephaly or the specific cry mentioned. * **46,XY:** This represents a normal male karyotype and does not explain the constellation of congenital anomalies described. **High-Yield Clinical Pearls for NEET-PG:** * **Cri-du-chat** is also known as **5p minus syndrome**. * **Most common cardiac defect:** Patent Ductus Arteriosus (PDA) (though VSD is also frequently seen). * **Diagnosis:** Confirmed via **Karyotyping** or **FISH** (Fluorescence In Situ Hybridization) if the deletion is submicroscopic. * **Vocal Cord Finding:** Laryngeal hypoplasia is responsible for the characteristic cry.

Q: Which reflex is not present in a child at birth?

Symmetric tonic neck reflex. **Explanation:** Primitive reflexes are involuntary motor responses originating in the brainstem and spinal cord. They are categorized based on their time of appearance: some are present at birth (neonatal reflexes), while others appear later as the nervous system matures. **Why Option B is Correct:** The **Symmetric Tonic Neck Reflex (STNR)** is not a neonatal reflex. It typically appears between **6 to 9 months of age** and is often referred to as a "bridging reflex" because it helps the infant transition from lying on the floor to quadruped crawling. When the head is flexed, the arms flex and legs extend; when the head is extended, the arms extend and legs flex. **Why the Other Options are Incorrect:** * **A. Moro’s Reflex:** A classic primitive reflex present at birth (appears at 28-32 weeks gestation). It disappears by 3–6 months. * **C. Crossed Extensor Reflex:** A spinal reflex present at birth. When one leg is extended and the sole is stimulated, the opposite leg flexes, adducts, and then extends. * **D. Asymmetric Tonic Neck Reflex (ATNR):** Also known as the "fencing posture," it is present at birth (though most prominent at 2 months) and disappears by 4–6 months. **High-Yield Clinical Pearls for NEET-PG:** * **Persistence:** If primitive reflexes (like Moro’s or ATNR) persist beyond 6 months, it is a strong clinical indicator of **Cerebral Palsy** or upper motor neuron lesions. * **Parachute Reflex:** This is the most important protective reflex. It appears at **7–9 months** and, unlike primitive reflexes, **persists for life**. * **Stepping/Walking Reflex:** Present at birth and disappears by 2 months; it is one of the earliest to vanish.

Q: This developmental milestone is typically achieved by what age?

10 months. ***10 months*** - **Pincer grasp** (picking up small objects between thumb and index finger) is typically achieved by 10 months of age according to standard developmental milestones. - This represents a crucial **fine motor milestone** indicating proper development of **hand-eye coordination** and **neurological maturation**. *6 months* - At 6 months, infants typically achieve **palmar grasp** (grasping objects with whole hand) but lack the **precision** required for pincer grasp. - Other milestones at this age include **sitting with support** and **transferring objects** from hand to hand. *12 months* - By 12 months, **pincer grasp** is already well-established and infants progress to more complex skills like **walking independently**. - This age is associated with **gross motor milestones** like **cruising along furniture** and **standing without support**. *18 months* - At 18 months, children demonstrate advanced **fine motor skills** like **scribbling** and **stacking 3-4 blocks**. - **Language development** becomes prominent with **10-25 words** vocabulary and ability to **follow simple commands**.

Q: Object permanence in a child is typically observed after which age?

6 months. **Explanation:** **Object permanence** is a cognitive milestone where a child understands that an object continues to exist even when it is hidden from sight or cannot be heard or touched. This concept was famously described by Jean Piaget as part of the **Sensorimotor stage** of cognitive development. * **Why 6 months is correct:** While the full mastery of object permanence is a gradual process that matures by 18–24 months, it **typically begins to emerge at 6 months**. At this age, a child will start to look for an object that has been partially hidden or dropped (visual tracking). By 9 months, this becomes more robust as they actively search for completely hidden objects. For NEET-PG purposes, 6 months is the standard benchmark for the *onset* of this behavior. **Analysis of Incorrect Options:** * **9 months:** While many textbooks highlight 9 months as the age where a child searches for a *completely* hidden object (and may commit the "A-not-B error"), the initial observation of the concept begins earlier at 6 months. * **12 months:** By this age, object permanence is well-established. A 12-month-old can follow the displacement of objects and enjoys games like "hide and seek." * **15 months:** This is too late for the initial observation of this milestone. **High-Yield Clinical Pearls for NEET-PG:** * **Stranger Anxiety:** Also begins around **6 months**, peaking at 9 months. It is cognitively linked to object permanence (the child remembers the parent exists and realizes the stranger is "not-parent"). * **Separation Anxiety:** Typically starts at **9 months** and peaks at 12–18 months. * **Mirror Recognition:** A child recognizes themselves in a mirror (self-awareness) by **18 months**. * **Pica:** Usually observed after **18 months** (before this, mouthing objects is considered a normal developmental stage).

Q: All of the following may occur in Down's syndrome except –

Undescended testis. **Explanation:** Down’s syndrome (Trisomy 21) is the most common chromosomal disorder and is associated with a wide spectrum of multisystemic anomalies. **Why "Undescended Testis" is the correct answer:** While Down’s syndrome is associated with several genitourinary issues (such as an increased risk of testicular germ cell tumors and infertility), **undescended testis (cryptorchidism)** is not a classic or defining feature of the syndrome. In contrast, cryptorchidism is a hallmark feature of other chromosomal trisomies, specifically **Trisomy 13 (Patau syndrome)** and **Trisomy 18 (Edwards syndrome)**. **Analysis of Incorrect Options:** * **Hypothyroidism (Option A):** Endocrine dysfunction is very common in Down’s syndrome. Patients have a significantly higher prevalence of both congenital and acquired autoimmune hypothyroidism compared to the general population. * **Ventricular Septal Defect (Option C):** Congenital heart disease (CHD) occurs in approximately 40-50% of cases. While **Atrioventricular Septal Defect (Endocardial Cushion Defect)** is the most characteristic, VSD and ASD are also frequently observed. * **Brushfield’s Spots (Option D):** These are small, white/grayish spots on the periphery of the iris due to aggregation of connective tissue. They are a classic diagnostic physical finding in Down’s syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Most common Cardiac Defect:** Endocardial Cushion Defect (AVSD). * **Most common GI Anomaly:** Duodenal Atresia ("Double Bubble" sign). * **Hematological Association:** Increased risk of ALL (Acute Lymphoblastic Leukemia) and AMKL (Acute Megakaryoblastic Leukemia - M7). * **Neurological:** Early-onset Alzheimer’s disease (due to APP gene on Chromosome 21) and Atlanto-axial instability.

Q: What developmental milestone is typically achieved by a 3-year-old child?

Build a bridge of 3 cubes. **Explanation:** Developmental milestones are a high-yield area for NEET-PG, focusing on the chronological progression of motor, social, and cognitive skills. **1. Why Option A is Correct:** At **3 years of age**, a child’s fine motor coordination and spatial perception have developed sufficiently to **build a bridge with 3 cubes** after a demonstration. This milestone marks a transition from simple stacking (tower building) to constructing specific shapes. **2. Why the other options are incorrect:** * **Copy a square (Option B):** This is a **4-year-old** milestone. At 3 years, a child can copy a circle, but the complex intersecting lines and corners of a square require more advanced visual-motor integration. * **Identify left and right (Option C):** This is a higher-order cognitive and spatial orientation task typically achieved by **6 years** of age. * **All of the above (Option D):** Incorrect because options B and C belong to older age groups. **High-Yield Clinical Pearls for NEET-PG:** * **Cube Towers Rule of Thumb:** * 15 months: 2 cubes * 18 months: 3 cubes * 2 years: 6 cubes * 3 years: 9 cubes (or a 3-cube bridge) * **Drawing/Copying Sequence:** Circle (3 yrs) → Cross (4 yrs) → Square (4.5 yrs) → Triangle (5 yrs) → Diamond (6 yrs). * **Language at 3 years:** A child can give their full name and gender, and speak in sentences of 3–4 words. * **Social at 3 years:** Group play and sharing begin (parallel play transitions to associative play).

Q: Which carpal bone ossifies at approximately 2 months of age?

Capitate. **Explanation:** Bone age is a crucial clinical indicator of a child's biological maturity. In pediatrics, the ossification of carpal bones follows a predictable chronological sequence, which is typically assessed using an X-ray of the non-dominant hand and wrist. **Why Capitate is Correct:** The **Capitate** is the first carpal bone to ossify, appearing at approximately **2 months** of age. It is closely followed by the **Hamate**, which ossifies at around 3 months. A high-yield mnemonic to remember the sequence of ossification is: *"Go (Capitate) Home (Hamate) Lucy (Lunate) To (Triquetrum) The (Trapezium) Theater (Trapezoid) Please (Pisiform)."* **Analysis of Incorrect Options:** * **B. Pisiform:** This is the last carpal bone to ossify, typically appearing between **9–12 years** of age. It is a sesamoid bone within the flexor carpi ulnaris tendon. * **C. Lunate:** This bone usually ossifies around **2–4 years** of age. * **D. Trapezoid:** This bone ossifies relatively late in the sequence, usually between **4–6 years** of age. **NEET-PG High-Yield Pearls:** * **Rule of Thumb:** The number of carpal bones present on an X-ray is roughly equal to **Age in years + 1** (valid up to age 8). * **At Birth:** No carpal bones are ossified. * **First to appear:** Capitate (2 months). * **Last to appear:** Pisiform (9-12 years). * **Clinical Significance:** Delayed bone age is seen in Hypothyroidism (most common cause of significant delay), Growth Hormone deficiency, and Malnutrition. Advanced bone age is seen in Precocious Puberty and Congenital Adrenal Hyperplasia.

Q: A 3-year-old child has normal height for age, abnormal weight for age, and abnormal weight for height. Which of the following is NOT a diagnosis that explains these findings?

Chronic malnutrition. To understand this question, we must apply the **Waterlow Classification** and the WHO growth parameters used to differentiate types of malnutrition. ### **1. Why "Chronic Malnutrition" is the Correct Answer** In **Chronic Malnutrition (Stunting)**, the child has suffered from nutritional deficiencies over a long period. This leads to a deficit in linear growth. * **Key Finding:** Low Height-for-Age (Stunting). * **The Catch:** Because the child is short for their age, their weight is often proportional to their shorter height. Therefore, they may have a **normal Weight-for-Height**. * **In the Question:** The child has a **normal height**, which directly contradicts the definition of chronic malnutrition. ### **2. Analysis of Incorrect Options** * **A. Acute Malnutrition (Wasting):** This is characterized by rapid weight loss or failure to gain weight. The child’s height remains normal (as height takes time to be affected), but they are thin for their height. This matches the scenario: Normal Height + Abnormal Weight-for-Height. * **C. Acute on Chronic Malnutrition:** This occurs when a child who is already stunted (short) suffers a fresh episode of weight loss. They will have abnormal Weight-for-Age, Height-for-Age, and Weight-for-Height. While this child has abnormal weight parameters, the "Normal Height" in the stem makes "Chronic" the most definitive exclusion. ### **3. NEET-PG High-Yield Pearls** * **Wasting (Weight-for-Height):** Indicates **Acute** malnutrition. It is the most sensitive indicator of current nutritional status. * **Stunting (Height-for-Age):** Indicates **Chronic** malnutrition. It reflects long-term socioeconomic deprivation. * **Underweight (Weight-for-Age):** A composite indicator that does not distinguish between wasting and stunting. * **Gomez Classification:** Uses only Weight-for-Age. * **Waterlow Classification:** Uses Weight-for-Height (Wasting) and Height-for-Age (Stunting).

Question 1

A 6-month-old child presented with diarrhea for a few days and dermatitic lesions on the hands and feet. Scalp hair was comparatively sparse. Deficiency of zinc was suspected. What is true about acrodermatitis enteropathica?

Accepted Answer

Autosomal recessive inheritance

Answer

Autosomal dominant inheritance

Answer

Partially cured by zinc treatment

Answer

Requires lifelong treatment

Question 2

A 3-year-old boy presents with progressive developmental delay, ataxia, seizures, and inappropriate laughter since infancy. DNA analysis shows he has inherited both number 15 chromosomes from his father. These findings are most likely indicative of which of the following genetic mechanisms?

Accepted Answer

Genomic imprinting

Answer

Maternal inheritance pattern

Answer

Mutation of mitochondrial DNA

Answer

Trinucleotide repeat expansion

Question 3

A 2-year-old child presents with mental retardation, slow development, and multiple
heart defects. The child has a high-pitched, cat-like cry. Physical examination reveals microcephaly, hypertelorism, micrognathia, epicanthal folds, low-set ears, and hypotonia. What karyotypic abnormality would be expected?

Accepted Answer

5p-

Answer

22q11-

Answer

45,XO

Answer

46,XY

Question 4

Which reflex is not present in a child at birth?

Accepted Answer

Symmetric tonic neck reflex

Answer

Moro's reflex

Answer

Crossed extensor reflex

Answer

Asymmetric tonic neck reflex

Question 5

This developmental milestone is typically achieved by what age?

Accepted Answer

10 months

Answer

6 months

Answer

12 months

Answer

18 months

Question 6

Object permanence in a child is typically observed after which age?

Accepted Answer

6 months

Answer

9 months

Answer

12 months

Answer

15 months

Question 7

All of the following may occur in Down's syndrome except –

Accepted Answer

Undescended testis

Answer

Hypothyroidism

Answer

Ventricular septal defect

Answer

Brushfield's spots

Question 8

What developmental milestone is typically achieved by a 3-year-old child?

Accepted Answer

Build a bridge of 3 cubes

Answer

Copy a square

Answer

Identify left and right

Answer

All of the above

Question 9

Which carpal bone ossifies at approximately 2 months of age?

Accepted Answer

Capitate

Answer

Pisiform

Answer

Lunate

Answer

Trapezoid

Question 10

A 3-year-old child has normal height for age, abnormal weight for age, and abnormal weight for height. Which of the following is NOT a diagnosis that explains these findings?

Accepted Answer

Chronic malnutrition

Answer

Acute malnutrition

Answer

Acute on chronic malnutrition

Answer

None of the above

Growth and Development — MCQs

Growth and Development — MCQs

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