Growth and Development Practice Questions

Q: Fixation reflex of eyes develops at what age?

4-5 months. **Explanation:** The development of visual milestones in an infant follows a predictable chronological sequence as the macula and neurological pathways mature. **Why 4-5 months is correct:** The **fixation reflex** (the ability to maintain gaze on an object) begins to develop shortly after birth but is rudimentary. By **4-5 months**, the reflex becomes well-established and stable. At this stage, the infant can not only fixate on an object but also follow it across the midline and maintain binocular vision. This coincides with the development of the macula and the maturation of the fovea centralis. **Analysis of Incorrect Options:** * **A. 2-4 months:** During this period, the infant begins to follow moving objects (tracking) and develops the "social smile" (6-8 weeks), but the fixation reflex is still inconsistent and easily broken. * **C & D. 6-9 months:** By this age, the infant has already mastered fixation and is developing more complex visual skills, such as depth perception (stereopsis) and the ability to recognize familiar faces from a distance. **High-Yield Clinical Pearls for NEET-PG:** * **Birth:** Can fixate on a near object (20-30 cm) momentarily; visual acuity is roughly 6/60. * **1 month:** Follows light to the midline. * **2 months:** Follows objects beyond the midline. * **3 months:** Follows objects through 180 degrees (side to side). * **4-5 months:** Established fixation reflex and binocular vision. * **6 months:** Reaches out for objects (hand-eye coordination). * **1 year:** Visual acuity reaches near-adult levels (approx. 6/9 to 6/6).

Q: Trisomy 13 is seen in which syndrome?

Patau syndrome. **Explanation:** The correct answer is **Patau syndrome**. This condition is a chromosomal abnormality characterized by the presence of an extra copy of chromosome 13 (**Trisomy 13**). It is the least common and most severe of the viable autosomal trisomies, often resulting in significant midline defects due to defective prechordal mesoderm development. **Analysis of Options:** * **Patau Syndrome (Trisomy 13):** Classically presents with the "3 Ps": **P**olydactyly, **P**alates (Cleft lip/palate), and **P**unch-out scalp defects (Aplasia cutis congenita). Other features include microphthalmia and holoprosencephaly. * **Edward Syndrome (Trisomy 18):** The second most common autosomal trisomy. Key features include clenched fists with overlapping fingers, rocker-bottom feet, and micrognathia. * **Down Syndrome (Trisomy 21):** The most common autosomal trisomy. It is characterized by intellectual disability, flat facial profile, simian crease, and cardiac defects (Endocardial cushion defects). * **Turner Syndrome (45, XO):** A sex chromosome monosomy in females. Features include short stature, webbed neck, widely spaced nipples (shield chest), and streak ovaries. **High-Yield Clinical Pearls for NEET-PG:** * **Amniotic Fluid:** Trisomy 13 and 18 are frequently associated with polyhydramnios due to defective swallowing. * **Maternal Age:** The risk for all three autosomal trisomies (13, 18, 21) increases with advanced maternal age. * **First Trimester Screening:** Look for decreased PAPP-A and increased nuchal translucency in these conditions. * **Survival:** Most infants with Patau syndrome die within the first month of life; survival beyond one year is rare (<10%).

Q: A child presents with antimongoloid slant, pulmonary stenosis, short stature, and undescended testis. What is the likely diagnosis?

Noonan syndrome. **Explanation:** The clinical presentation of **antimongoloid slant** (down-slanting palpebral fissures), **short stature**, and **undescended testis** (cryptorchidism), combined with **pulmonary stenosis**, is the classic diagnostic tetrad for **Noonan Syndrome**. Often referred to as the "Male Turner Syndrome" (though it affects both sexes), it is an autosomal dominant condition caused by mutations in the RAS-MAPK pathway (most commonly the **PTPN11 gene**). **Why the other options are incorrect:** * **Hypoparathyroidism:** Typically presents with hypocalcemic tetany, seizures, or dental hypoplasia. While DiGeorge syndrome involves hypoparathyroidism and heart defects, the specific facial features and pulmonary stenosis described are more characteristic of Noonan. * **Klinefelter Syndrome (47, XXY):** Characterized by **tall stature**, small firm testes, gynecomastia, and infertility. It lacks the facial dysmorphism and congenital heart defects (pulmonary stenosis) seen here. * **XYY Syndrome:** Usually presents with tall stature, severe acne, and sometimes behavioral issues, but lacks the specific dysmorphic features and cardiac anomalies of Noonan syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Cardiac Association:** The most common lesion in Noonan syndrome is **Pulmonary Valvular Stenosis**, followed by Hypertrophic Cardiomyopathy (HCM). (Contrast this with Turner syndrome, which is associated with Bicuspid Aortic Valve and Coarctation of the Aorta). * **Genetics:** Most common mutation is **PTPN11** on chromosome 12. * **Karyotype:** Usually normal (46, XY or 46, XX), unlike Turner syndrome. * **Other features:** Webbed neck, low-set ears, and pectus excavatum/carinatum.

Q: A child presents with bouts of laughter. What is the most likely diagnosis?

Angelman syndrome. **Explanation:** The correct diagnosis is **Angelman syndrome**, a neurodevelopmental disorder characterized by a distinct behavioral phenotype often referred to as a "Happy Puppet" appearance. **Why Angelman Syndrome is correct:** Angelman syndrome is caused by the loss of function of the **maternally inherited UBE3A gene** on chromosome **15q11-q13** (most commonly via maternal deletion). Clinically, these children exhibit a frequent happy demeanor, characterized by **paroxysms of laughter**, smiling, and an excitable personality. Other key features include severe intellectual disability, speech impairment, ataxia (jerky movements), and microcephaly. **Why the other options are incorrect:** * **Russell-Silver Syndrome:** Primarily a growth disorder characterized by intrauterine growth restriction (IUGR), short stature, triangular facies, and limb asymmetry. It is not associated with paroxysmal laughter. * **Prader-Willi Syndrome:** Caused by the loss of the **paternally inherited** genes on the same region (15q11-q13). It presents with neonatal hypotonia, hyperphagia leading to early-onset obesity, and hypogonadism, but not bouts of laughter. * **Fragile X Syndrome:** The most common cause of inherited intellectual disability in males. It presents with macroorchidism, large ears, and a long face. While behavioral issues like ADHD or autism are common, spontaneous bouts of laughter are not a hallmark. **High-Yield Clinical Pearls for NEET-PG:** * **Genetics:** Angelman = Maternal deletion/Paternal Uniparental Disomy (UPD). Prader-Willi = Paternal deletion/Maternal UPD. * **Mnemonic:** **A**ngelman involves **A**bsent **M**aternal contribution (Happy **A**ngel). * **EEG Finding:** High-amplitude slow-wave activity (noted even in the absence of seizures) is common in Angelman syndrome. * **Key Feature:** "Happy Puppet" gait (ataxic, wide-based, with uplifted flexed arms).

Q: All of the following are true about Down syndrome except:

Hypoplasia of the middle phalanx of the 1st finger. **Explanation:** Down syndrome (Trisomy 21) is the most common chromosomal disorder and presents with a distinct constellation of clinical features. **Why Option D is the Correct Answer:** The statement is incorrect because the characteristic skeletal finding in Down syndrome is **hypoplasia of the middle phalanx of the 5th finger** (the little finger), not the 1st finger (the thumb). This hypoplasia leads to **clinodactyly**, which is the permanent inward curvature of the fifth finger toward the fourth. **Analysis of Incorrect Options:** * **Option A (Duodenal Atresia):** This is a classic gastrointestinal association. Approximately 30% of infants with duodenal atresia have Down syndrome. It presents radiographically as the "double bubble" sign. * **Option B (Trisomy 21):** This is the fundamental genetic cause of Down syndrome, occurring due to meiotic non-disjunction in 95% of cases. * **Option C (Simian Crease):** Also known as a single transverse palmar crease, this is a hallmark physical finding present in about 45-50% of affected individuals. **High-Yield Clinical Pearls for NEET-PG:** * **Cardiac:** The most common defect is an **Atrioventricular Septal Defect (AVSD)** / Endocardial Cushion Defect. * **Neurological:** Increased risk of early-onset Alzheimer’s disease and atlantoaxial instability. * **Hematological:** Increased risk of **AMKL** (Acute Megakaryoblastic Leukemia) before age 3 and **ALL** (Acute Lymphoblastic Leukemia) after age 3. * **Screening:** Low AFP, low unconjugated estriol (uE3), and high hCG/Inhibin-A on the quadruple screen are suggestive of Down syndrome.

Q: What developmental milestone is typically achieved by a 3-month-old baby?

Head control. **Explanation:** Developmental milestones follow a predictable **cephalocaudal** (head-to-toe) and **proximodistal** (center-to-periphery) pattern. **Correct Answer: B. Head control** By 3 months of age, a baby typically achieves significant head control. When held in a sitting position, the head is held erect and steady. In a prone position, the infant can lift their head and chest off the surface, supporting themselves on their forearms. This is a foundational gross motor milestone that precedes sitting and standing. **Analysis of Incorrect Options:** * **A. Pincer grasp:** This is a fine motor milestone achieved much later, typically between **9 to 10 months**. It involves using the thumb and index finger to pick up small objects. * **C. Sitting with support:** While a 3-month-old has head control, they generally do not sit with support until **5 to 6 months**. Sitting *without* support is usually achieved by 8 months. * **D. Transferring objects:** This fine motor milestone involves moving an object from one hand to the other, which typically occurs at **6 months** (along with the disappearance of the palmar grasp reflex). **High-Yield Clinical Pearls for NEET-PG:** * **Social Smile:** Appears at **2 months** (the first social milestone). * **Disappearance of Primitive Reflexes:** Most primitive reflexes (Moro, Rooting, Palmar grasp) disappear by **3–4 months** as cortical inhibition increases. * **Red Flag:** Failure to achieve head control by **4 months** warrants immediate developmental evaluation for cerebral palsy or neuromuscular disorders.

Q: Paternal 15 chromosome deletion is seen in which condition?

Prader Willi syndrome. ### Explanation The correct answer is **Prader-Willi Syndrome (PWS)**. This question tests the concept of **Genomic Imprinting**, where the expression of a gene depends on whether it is inherited from the mother or the father. **1. Why Prader-Willi Syndrome is correct:** PWS occurs due to the loss of function of genes in the **paternal** copy of chromosome **15q11-q13**. Under normal conditions, the maternal genes in this region are "silenced" (imprinted). If the paternal segment is deleted (70% of cases) or if there is Maternal Uniparental Disomy (inheritance of two maternal copies), no active genes remain in this region. * **Clinical Features:** Infantile hypotonia, feeding difficulties followed by hyperphagia and obesity, hypogonadism, and small hands/feet. **2. Why other options are incorrect:** * **Angelman Syndrome:** This involves the **maternal** deletion of the same region (15q11-q13). It presents with the "Happy Puppet" profile: inappropriate laughter, ataxia, and severe intellectual disability. * **Down Syndrome:** Caused by **Trisomy 21** (an extra chromosome 21), not a deletion. * **Turner Syndrome:** Caused by **Monosomy X (45, XO)**, involving the loss of an entire sex chromosome in females. **3. NEET-PG High-Yield Pearls:** * **Mnemonic:** **P**aternal deletion = **P**rader-Willi; **M**aternal deletion = **A**ngelman (**M**ama's **A**ngel). * **Diagnosis:** The gold standard screening test is **DNA Methylation analysis**, which detects abnormal imprinting. * **Uniparental Disomy (UPD):** Remember that *Maternal* UPD causes Prader-Willi, while *Paternal* UPD causes Angelman.

Q: A male child presented with cryptorchidism, mental retardation, and pulmonary stenosis. He has a normal karyotype. Which of the following is the diagnosis?

Noonan's syndrome. **Explanation:** The clinical presentation of **pulmonary stenosis**, **cryptorchidism**, and **intellectual disability** in a male child with a **normal karyotype** is a classic description of **Noonan’s Syndrome**. 1. **Why Noonan’s Syndrome is correct:** Often referred to as the "Male Turner Syndrome," Noonan’s syndrome is an autosomal dominant disorder (most commonly due to mutations in the *PTPN11* gene). While it shares phenotypic features with Turner syndrome (webbed neck, short stature, low-set ears, and cubitus valgus), it occurs in both males and females. Crucially, the karyotype is normal (46, XY or 46, XX). The most common cardiac lesion is **Pulmonary Valve Stenosis** (dysplastic valve), followed by Hypertrophic Cardiomyopathy (HCM). 2. **Why other options are incorrect:** * **Turner’s Syndrome (45, X):** Occurs only in females. The most common cardiac defects are **Bicuspid Aortic Valve** and **Coarctation of the Aorta**. * **Down’s Syndrome (Trisomy 21):** Characterized by distinct facies (up-slanting palpebral fissures, Simian crease). The most common cardiac defect is an **Atrioventricular Septal Defect (AVSD)**. * **Angelman’s Syndrome:** A neurodevelopmental disorder (deletion on maternal chromosome 15) characterized by "happy puppet" behavior, seizures, and severe intellectual disability, but it is not typically associated with pulmonary stenosis or cryptorchidism. **High-Yield Clinical Pearls for NEET-PG:** * **Noonan Syndrome:** Pulmonary Stenosis + Normal Karyotype + PTPN11 mutation. * **Turner Syndrome:** Coarctation of Aorta + 45, X Karyotype. * **Williams Syndrome:** Supravalvular Aortic Stenosis + "Elfin" facies + Hypercalcemia. * **Alagille Syndrome:** Peripheral Pulmonary Artery Stenosis + Bile duct paucity (jaundice) + Butterfly vertebrae.

Q: A child can draw a triangle but not a diamond shape at what age?

5 years. **Explanation:** The development of fine motor skills follows a predictable chronological sequence, specifically regarding the ability to copy geometric shapes. This progression reflects the maturation of the child’s hand-eye coordination and cognitive processing. * **Why 5 years is correct:** By the age of **5 years**, a child has developed the fine motor control and spatial perception required to draw a **triangle**. However, drawing a **diamond** (rhombus) is a more complex task because it requires the ability to execute oblique lines that intersect at specific angles across the midline. A child typically masters the diamond shape at **6 years** of age. Therefore, the window where a child can draw a triangle but not yet a diamond is at 5 years. **Analysis of Incorrect Options:** * **3 years:** At this age, a child can typically copy a **circle**. They are just beginning to master vertical and horizontal strokes. * **4 years:** At this age, a child can copy a **cross (+)** and a **square**. They cannot yet master the diagonal intersections required for a triangle. * **6 years:** By this age, the child has reached the milestone of drawing a **diamond**. Since the question asks for the age where they *cannot* yet draw a diamond, 6 years is incorrect. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Geometric Shapes:** Line (2y) → Circle (3y) → Plus/Square (4y) → Triangle (5y) → Diamond (6y). * **Handedness:** Usually determined by **2 to 3 years** of age. * **Draw-a-Person Test:** A 4-year-old typically draws a person with 3 parts; a 5-year-old draws a person with 6 parts. * **Rule of Thumb:** If a child cannot copy a square by age 5, it may indicate a developmental delay in fine motor or cognitive domains.

Q: A 4-year-old child can perform which of the following actions?

Stand on one foot for 20 seconds. This question tests the knowledge of **Gross Motor Milestones** in the preschool age group, a high-yield area for NEET-PG. ### **Explanation of the Correct Answer** **Option C (Stand on one foot for 20 seconds)** is the correct milestone for a **4-year-old**. At this age, balance and coordination improve significantly. While a 3-year-old can balance on one foot for only a few seconds, a 4-year-old can typically maintain this position for 5 to 10 seconds (with some sources and advanced testing criteria extending this to 20 seconds as they approach age 5). ### **Analysis of Incorrect Options** * **Option A (Hop on a single leg for 15 feet):** This is a more advanced coordination task. While a 4-year-old can hop on one foot, hopping for a sustained distance like 15 feet is typically expected of a **5-year-old**. * **Option B (Skip without falling):** Skipping is a complex motor skill requiring alternating coordination. It is a milestone for a **5-year-old**. (Note: A 4-year-old may gallop, but true skipping is age 5). * **Option D (Walk down stairs with alternating steps):** This is a milestone for a **3-year-old**. A 2-year-old goes down stairs two feet per step; by age 3, they alternate feet going up and down. ### **High-Yield Clinical Pearls for NEET-PG** * **Stair Climbing Rule:** * 2 years: Up and down (2 feet per step). * 3 years: Up (alternating), Down (alternating). * **Drawing/Fine Motor Milestones:** * 3 years: Circle * 4 years: Cross (+) and Square * 5 years: Triangle (Hardest to draw) * **Social Milestone:** A 4-year-old engages in **cooperative play** and can tell stories, whereas a 3-year-old engages in **parallel play**.

Question 1

Fixation reflex of eyes develops at what age?

Accepted Answer

4-5 months

Answer

2-4 months

Answer

9 months

Answer

6-8 months

Question 2

Trisomy 13 is seen in which syndrome?

Accepted Answer

Patau syndrome

Answer

Edward syndrome

Answer

Down syndrome

Answer

Turner syndrome

Question 3

A child presents with antimongoloid slant, pulmonary stenosis, short stature, and undescended testis. What is the likely diagnosis?

Accepted Answer

Noonan syndrome

Answer

Hypoparathyroidism

Answer

Klinefelter syndrome

Answer

XYY sex chromosomes

Question 4

A child presents with bouts of laughter. What is the most likely diagnosis?

Accepted Answer

Angelman syndrome

Answer

Russell-Silver syndrome

Answer

Prader-Willi syndrome

Answer

Fragile X syndrome

Question 5

All of the following are true about Down syndrome except:

Accepted Answer

Hypoplasia of the middle phalanx of the 1st finger

Answer

Duodenal atresia

Answer

Trisomy 21

Answer

Simian crease

Question 6

What developmental milestone is typically achieved by a 3-month-old baby?

Accepted Answer

Head control

Answer

Pincer grasp

Answer

Sitting with support

Answer

Transferring objects from one hand to another

Question 7

Paternal 15 chromosome deletion is seen in which condition?

Accepted Answer

Prader Willi syndrome

Answer

Angelman syndrome

Answer

Down syndrome

Answer

Turner syndrome

Question 8

A male child presented with cryptorchidism, mental retardation, and pulmonary stenosis. He has a normal karyotype. Which of the following is the diagnosis?

Accepted Answer

Noonan's syndrome

Answer

Turner's syndrome

Answer

Down's syndrome

Answer

Angelman's syndrome

Question 9

A child can draw a triangle but not a diamond shape at what age?

Accepted Answer

5 years

Answer

3 years

Answer

4 years

Answer

6 years

Question 10

A 4-year-old child can perform which of the following actions?

Accepted Answer

Stand on one foot for 20 seconds

Answer

Hop on a single leg for 15 feet

Answer

Skip without falling to either side

Answer

Walk down the stairs with alternating steps while holding onto a handrail

Growth and Development — MCQs

Growth and Development — MCQs

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