Growth and Development Practice Questions

Q: A woman whose previous child had Down syndrome (karyotype showed nondisjunction) comes for preconceptional counseling. What is the chance of Down syndrome in a subsequent pregnancy?

1%. ### Explanation **1. Why the Correct Answer is Right (Option A: 1%)** Down syndrome (Trisomy 21) most commonly occurs due to **meiotic nondisjunction** (95% of cases), which is typically a sporadic event. However, once a woman has had a child with Trisomy 21 due to nondisjunction, her risk of having another affected child is slightly higher than the age-matched general population risk. In clinical practice, this recurrence risk is estimated to be approximately **1%** (or the age-related risk, whichever is higher). This increase is attributed to potential germline mosaicism or genetic predisposition to nondisjunction. **2. Analysis of Incorrect Options** * **Option B (5%):** This is incorrect for nondisjunction. A 5% risk is more characteristic of a mother who is a carrier of a **Robertsonian translocation (14;21)**, where the recurrence risk is roughly 10-15% (though theoretically 33%). * **Option C (10%):** This is the approximate recurrence risk if the **father** is a carrier of a Robertsonian translocation (14;21). * **Option D (25%):** This risk does not correspond to standard Down syndrome inheritance patterns. It is more typical of autosomal recessive conditions. **3. NEET-PG High-Yield Pearls** * **Most common cause:** Meiotic nondisjunction (95%), mostly occurring during Maternal Meiosis I. * **Translocation:** Accounts for ~3-4% of cases. If a parent carries a **21;21 balanced translocation**, the recurrence risk is **100%**. * **Mosaicism:** Accounts for ~1-2% of cases; usually results in a milder phenotype. * **Screening:** The most sensitive first-trimester screen is the **Combined Test** (Nuchal translucency + PAPP-A + free β-hCG), which has a ~90% detection rate. * **Quadruple Test:** Performed between 15-20 weeks; shows **Low AFP, Low Estriol, High hCG, and High Inhibin A** (Mnemonic: **HI**gh = **H**CG and **I**nhibin).

Q: At what age does the first molar tooth typically appear?

12-13 months. **Explanation:** The eruption of primary (deciduous) teeth follows a predictable chronological sequence in pediatric development. The **first molar** typically erupts between **12 and 16 months** of age (average 12–13 months). This marks a significant transition in the child's dietary capabilities, moving from soft foods to more complex textures. **Analysis of Options:** * **A. 6–7 months:** This is the typical age for the eruption of the **lower central incisors**, which are usually the first teeth to appear. * **B. 8–9 months:** This period usually sees the eruption of the **upper central and lateral incisors**. * **C. 10–11 months:** At this stage, the **lower lateral incisors** typically emerge. * **D. 12–13 months (Correct):** This aligns with the standard developmental milestone for the **first deciduous molar**. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Eruption:** Central Incisor → Lateral Incisor → **First Molar** → Canine → Second Molar. (Note: The first molar erupts *before* the canine). * **Rule of 6s:** The first *permanent* tooth to erupt is the **first permanent molar** at **6 years** of age. * **Delayed Dentition:** Dentition is considered delayed if no teeth have erupted by **13 months**. The most common cause of delayed dentition is idiopathic, but it is also associated with conditions like hypothyroidism, hypoparathyroidism, and Down syndrome. * **Teething Formula:** For children under 2 years, the number of teeth can be estimated as: **Age (in months) – 6**.

Q: All the following are features of Down syndrome except:

Hypertonia. **Explanation:** The correct answer is **D. Hypertonia**. In Down syndrome (Trisomy 21), the characteristic finding is actually **generalized hypotonia** (floppiness) and joint hyperlaxity, rather than hypertonia. This hypotonia is often most prominent in the neonatal period and contributes to delayed motor milestones. **Analysis of Options:** * **A. Brushfield’s spots:** These are small, white or grayish-brown spots peripherally located on the iris. They are a classic ophthalmological sign of Down syndrome, though they can occasionally be seen in normal individuals. * **B. Simian crease:** Also known as a single transverse palmar crease, this is found in approximately 45-50% of children with Down syndrome. While not pathognomonic, it is a high-yield physical marker. * **C. Mental retardation:** Intellectual disability is a universal feature of Down syndrome, typically ranging from mild to moderate (IQ 35–70), though it can occasionally be severe. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Meiotic non-disjunction (95%), followed by Robertsonian translocation and mosaicism. * **Cardiac:** Endocardial cushion defects (ASD/VSD) are the most common congenital heart diseases. * **GI:** Duodenal atresia ("Double bubble" sign) and Hirschsprung disease are frequently associated. * **Dermatoglyphics:** Increased frequency of ulnar loops and a wide gap between the first and second toes (Sandal gap). * **Screening:** Low AFP, low Estriol, and high hCG/Inhibin-A (Quadruple screen). Increased Nuchal Translucency on ultrasound.

Q: What is the typical increase in height for boys during puberty?

20-30 cm. **Explanation:** The correct answer is **D (20-30 cm)**. Puberty is characterized by a significant "Adolescent Growth Spurt" (AGS), which accounts for approximately 20-25% of final adult height. In boys, this growth spurt typically occurs later than in girls (Tanner Stage 4) and is more intense due to the synergistic effects of growth hormone and higher levels of testosterone. On average, boys gain a total of **25-28 cm** during the entire pubertal period. **Analysis of Options:** * **A & B (3-5 cm / 5-10 cm):** These values are too low. A growth velocity of 5 cm/year is the *minimum* expected prepubertal growth rate. During the peak height velocity (PHV) of puberty, boys grow at a rate of about 9.5 cm/year. * **C (10-20 cm):** This range is more characteristic of the total pubertal height gain in **girls**, who typically gain about **20-25 cm** (average 23 cm). Boys consistently outgain girls by about 3-5 cm during this period. **High-Yield Clinical Pearls for NEET-PG:** * **Peak Height Velocity (PHV):** Occurs at SMR (Sexual Maturity Rating) Stage 4 in boys and Stage 2-3 in girls. * **Sequence:** In girls, the growth spurt is an early event (often the first sign alongside thelarche); in boys, it is a relatively late event (occurring after testicular enlargement and pubic hair development). * **Bone Age:** This is the best indicator of skeletal maturity and remaining growth potential during puberty. * **Formula for Mid-Parental Height (Target Height):** * Boys: [Father’s height + Mother’s height + 13 cm] / 2 * Girls: [Father’s height + Mother’s height - 13 cm] / 2

Q: In children, which permanent teeth are most frequently missing?

Maxillary lateral incisors. **Explanation:** The congenital absence of one or more teeth is known as **hypodontia**. Excluding the third molars (wisdom teeth), which are the most common teeth to be missing overall, the **Maxillary lateral incisors** are the most frequently missing permanent teeth in children. **1. Why Maxillary Lateral Incisors are correct:** In the sequence of dental development, the most distal tooth of any given type (incisor, premolar, or molar) is the most likely to be genetically absent. The maxillary lateral incisor is the "end of the line" for the incisor series. Its absence is often hereditary and can be associated with other dental anomalies, such as "peg laterals" (microdontia) on the contralateral side. **2. Analysis of Incorrect Options:** * **Second Premolars (Option B):** These are the **second most common** permanent teeth to be missing (after maxillary lateral incisors, excluding third molars). While very common, statistically they trail slightly behind the lateral incisors in most pediatric dental surveys. * **First Premolars (Option A):** These are rarely missing congenitally. They are, however, the teeth most frequently extracted for orthodontic purposes to resolve crowding. * **Mandibular Lateral Incisors (Option D):** These are rarely missing compared to their maxillary counterparts. In the mandible, the central incisors are more stable, and the second premolars are the ones typically absent. **NEET-PG High-Yield Pearls:** * **Order of frequency for Hypodontia:** 3rd Molars > Maxillary Lateral Incisors > 2nd Premolars. * **Anodontia:** Complete absence of teeth (often associated with Ectodermal Dysplasia). * **Hyperdontia:** Supernumerary teeth; the most common is the **Mesiodens** (located between the two maxillary central incisors). * **First Permanent Tooth to Erupt:** Mandibular 1st Molar (6 years).

Q: A female child has recently learned to eat with a spoon without spilling, to dress and undress herself with supervision, and to understand that she is a girl. These skills are first mastered between the ages of?

2 and 3 years. This question tests the knowledge of developmental milestones across multiple domains: **Fine Motor, Adaptive (Self-help), and Social-Emotional.** ### **Explanation of the Correct Answer (A)** Between **2 and 3 years (specifically by age 3)**, a child achieves several key milestones mentioned in the stem: * **Fine Motor/Adaptive:** While a 2-year-old can use a spoon with some spilling, a **3-year-old** can eat with a spoon without spilling. * **Self-Help:** By age 3, a child can **undress and dress** themselves (except for buttons and laces) with supervision. * **Social/Cognitive:** Gender identity begins to form early, but by age 3, most children can **identify their own gender** and use "I, me, mine" appropriately. ### **Analysis of Incorrect Options** * **B (3 and 4 years):** By age 4, children become more independent. They can dress/undress *without* supervision and begin to use scissors to cut along a line. * **C (4 and 5 years):** A 5-year-old can dress and undress completely independently, including tying shoelaces. They also begin to understand the concept of rules and "fair play." * **D (5 and 6 years):** This age group masters complex tasks like skipping, drawing a person with 6 body parts, and printing their own name. ### **High-Yield Clinical Pearls for NEET-PG** * **Feeding Milestones:** * 6 months: Starts solids (weaning). * 9 months: Finger feeds (Pincer grasp). * 12-15 months: Uses a cup. * **3 years: Uses spoon without spilling.** * **Dressing Milestones:** * 1 year: Pulls off socks. * 2 years: Removes unfastened coat. * **3 years: Dresses/Undresses with supervision.** * 5 years: Ties shoelaces. * **Gender Identity:** Usually established by **30–36 months**. Gender stability (knowing gender stays the same) follows later (4–5 years).

Q: Which of the following teeth typically erupt between 20 to 30 months of age?

Second molar. The eruption of deciduous (milk) teeth follows a predictable chronological sequence, which is a high-yield topic for NEET-PG. ### **Explanation of the Correct Option** **C. Second Molar:** The second deciduous molars are the last of the primary teeth to erupt, typically appearing between **20 to 30 months** of age. By the time these teeth emerge, the child usually has a complete set of 20 primary teeth. ### **Analysis of Incorrect Options** * **A. First Molar:** These typically erupt between **12 to 18 months**. They appear after the incisors but before the canines (the "leapfrog" sequence). * **B. Lateral Upper Incisor:** These erupt between **8 to 12 months**. * **D. Lateral Lower Incisor:** These usually erupt between **7 to 10 months**, shortly after the central incisors. ### **Clinical Pearls for NEET-PG** * **Order of Eruption:** The general sequence is: Central Incisor → Lateral Incisor → **First Molar** → Canine → **Second Molar**. (Note: The molar erupts *before* the canine). * **First Tooth to Erupt:** Lower central incisor (usually at **6 months**). * **Delayed Dentition:** Defined as the absence of any teeth by **13 months** of age. The most common cause is idiopathic, but it is also associated with hypothyroidism, rickets, and Down syndrome. * **Rule of Four:** A helpful mnemonic—at 7 months (7-4=3) 0 teeth; at 11 months (11-4=7) 4 teeth; at 15 months (15-4=11) 8 teeth. * **Total Count:** There are **20** deciduous teeth and **32** permanent teeth. Permanent teeth begin appearing at **6 years** (starting with the 1st molar).

Q: At what age does a child typically wash their hands and put on their shoes independently?

36 months. **Explanation:** The development of self-help skills is a key component of the **Personal-Social domain** in pediatric development. Achieving independence in washing hands and putting on shoes requires a combination of fine motor coordination and cognitive maturity. **1. Why 36 months (3 years) is correct:** By **36 months**, a child develops the manual dexterity to rub their hands together under water and the cognitive sequence to understand the steps of hygiene. While they may still need help with laces or buckles, they can typically slide their feet into shoes and perform basic hand washing independently. This age also marks the milestone of "sharing toys" and "knowing their name and gender." **2. Analysis of Incorrect Options:** * **30 months (2.5 years):** At this age, a child is just beginning to assist in dressing (e.g., pushing arms through sleeves) but lacks the coordination for independent hand washing or putting on shoes correctly. * **48 months (4 years):** By this age, the child has progressed to more complex tasks, such as **brushing teeth** and **dressing/undressing independently** (including buttons). They can also use the toilet independently. * **60 months (5 years):** At this stage, children can perform complex tasks like **tying shoelaces**, which requires advanced fine motor "pincer" coordination and spatial awareness. **Clinical Pearls for NEET-PG:** * **Dressing Milestones:** 1 year (cooperates), 2 years (removes unfastened clothes), 3 years (puts on shoes), 5 years (ties laces). * **Social Milestones:** 2 months (social smile), 9 months (stranger anxiety), 18 months (symbolic play), 3 years (group play/sharing). * **Rule of Thumb:** If a question mentions "unbuttoning," think 30 months; "putting on shoes/washing hands," think 36 months; "buttoning," think 48 months.

Q: The age and sex of an individual are known by which age?

36 months. **Explanation:** The development of self-awareness and gender identity is a significant milestone in the psychosocial domain of pediatrics. By the age of **36 months (3 years)**, a child typically achieves the cognitive milestone of knowing their own **name, age, and sex**. **1. Why 36 months is correct:** At 3 years, children transition from simple parallel play to more interactive social behaviors. Cognitively, they can identify themselves as a boy or a girl and can state their age. This aligns with other 3-year milestones, such as the ability to ride a tricycle, build a tower of 9 blocks, and speak in 3-word sentences. **2. Why other options are incorrect:** * **24 months (2 years):** At this stage, a child can refer to themselves by name (using "I" or "me") and identify simple body parts, but they generally do not have a firm grasp of their chronological age or a stable concept of gender identity. * **48 months (4 hours):** By 4 years, children have moved beyond basic identity; they can tell stories, identify colors, and engage in cooperative play. Waiting until 48 months to identify one's sex would be considered a developmental lag. * **60 months (5 years):** This is the age of "readiness for school." Children at this age can dress and undress independently and have advanced language skills. Basic self-identification is established much earlier. **High-Yield Clinical Pearls for NEET-PG:** * **Gender Identity:** Usually established by age 3. * **Gender Stability:** Realizing gender stays the same over time (established by age 4–5). * **Drawing Milestones (High Yield):** * 2 years: Vertical line * 3 years: **Circle** * 4 years: **Cross/Square** * 5 years: **Triangle** * **Language Milestone:** A 3-year-old uses roughly 1,000 words and speaks in 3-word sentences.

Question 1

A woman whose previous child had Down syndrome (karyotype showed nondisjunction) comes for preconceptional counseling. What is the chance of Down syndrome in a subsequent pregnancy?

Accepted Answer

1%

Answer

5%

Answer

10%

Answer

25%

Question 2

At what age does the first molar tooth typically appear?

Accepted Answer

12-13 months

Answer

6-7 months

Answer

8-9 months

Answer

10-11 months

Question 3

All the following are features of Down syndrome except:

Accepted Answer

Hypertonia

Answer

Brushfield's spots in iris

Answer

Simian crease

Answer

Mental retardation

Question 4

What is the typical increase in height for boys during puberty?

Accepted Answer

20-30 cm

Answer

3-5 cm

Answer

5-10 cm

Answer

10-20 cm

Question 5

In children, which permanent teeth are most frequently missing?

Accepted Answer

Maxillary lateral incisors

Answer

First premolars

Answer

Second premolars

Answer

Mandibular lateral incisors

Question 6

Testicles are absent from the scrotum of a 1-year-old male infant. Physical examination reveals the testes are palpable in the inguinal canal. Which of the following terms is used to describe this condition?

Accepted Answer

Cryptorchism

Answer

Pseudohermaphroditism

Answer

True hermaphroditism

Answer

Congenital adrenal hyperplasia

Question 7

A female child has recently learned to eat with a spoon without spilling, to dress and undress herself with supervision, and to understand that she is a girl. These skills are first mastered between the ages of?

Accepted Answer

2 and 3 years

Answer

3 and 4 years

Answer

4 and 5 years

Answer

5 and 6 years

Question 8

Which of the following teeth typically erupt between 20 to 30 months of age?

Accepted Answer

Second molar

Answer

First molar

Answer

Lateral upper incisor

Answer

Lateral lower incisor

Question 9

At what age does a child typically wash their hands and put on their shoes independently?

Accepted Answer

36 months

Answer

30 months

Answer

48 months

Answer

60 months

Question 10

The age and sex of an individual are known by which age?

Accepted Answer

36 months

Answer

24 months

Answer

48 months

Answer

60 months

Growth and Development — MCQs

Growth and Development — MCQs

On this page

Practice by Chapter

Want unlimited practice?