DEVELOPMENTAL BIOLOGY EXAMINATION QUESTIONS AND CORRECT ANSWER WITH EXPLANATION GRADED A+ STUDY GUIDE

DEVELOPMENTAL BIOLOGY EXAMINATION QUESTIONS
AND CORRECT ANSWER WITH EXPLANATION GRADED
A+ STUDY GUIDE SOUTHERN NEW HAMPSHIRE
UNIVERSITY
1. Developmental biology is the study of:
A. Growth and development of organisms
B. Weather systems only
C. Rock formation only
D. Ocean currents only
Answer: A
Rationale: Developmental biology examines how organisms grow and develop.

2. Fertilization refers to the fusion of:
A. Sperm and egg cells
B. Bone and muscle cells
C. Blood and plasma
D. Hormones and enzymes
Answer: A
Rationale: Fertilization forms a zygote.

3. The fertilized egg cell is called a:
A. Zygote
B. Blastula
C. Neuron
D. Gamete
Answer: A
Rationale: First cell formed after fertilization.

4. Gametes are produced through:
A. Meiosis
B. Mitosis
C. Binary fission
D. Budding
Answer: A
Rationale: Meiosis produces haploid sex cells.

,5. Mitosis results in:
A. Two genetically identical cells
B. Four genetically different cells
C. One haploid cell
D. One diploid cell only
Answer: A
Rationale: Used for growth and repair.

6. Meiosis produces cells with:
A. Half the chromosome number
B. Double the chromosome number
C. No chromosomes
D. Extra nuclei only
Answer: A
Rationale: Essential for sexual reproduction.

7. Cleavage refers to rapid:
A. Cell divisions after fertilization
B. Bone growth only
C. Hormone secretion only
D. Protein digestion only
Answer: A
Rationale: Early embryonic divisions.

8. A morula is a:
A. Solid ball of cells
B. Hollow organ only
C. Mature embryo
D. Type of neuron
Answer: A
Rationale: Early stage after cleavage.

9. The blastula is characterized by:
A. A hollow ball of cells
B. Bone tissue formation only
C. Muscle development only
D. Nervous tissue only
Answer: A
Rationale: Contains a fluid-filled cavity.

, 10. Gastrulation forms the three primary:
A. Germ layers
B. Body cavities only
C. Bones only
D. Organs only
Answer: A
Rationale: Key developmental process.

11. The three germ layers are ectoderm, mesoderm, and:
A. Endoderm
B. Epidermis
C. Myoderm
D. Osteoderm
Answer: A
Rationale: Basic embryonic tissue layers.

12. The ectoderm gives rise mainly to the:
A. Nervous system and skin
B. Muscles and bones
C. Digestive tract only
D. Blood only
Answer: A
Rationale: Outer germ layer structures.

13. The mesoderm develops into:
A. Muscles and bones
B. Skin only
C. Nervous tissue only
D. Digestive lining only
Answer: A
Rationale: Middle germ layer derivatives.

14. The endoderm forms much of the:
A. Digestive and respiratory linings
B. Bones only
C. Skin only
D. Muscles only
Answer: A
Rationale: Inner germ layer functions.