Tamil Nadu Class 9 Science Biology Unit Test — Samacheer Kalvi

Class 9 Science — Biology Unit Test

Time: 2 Hours | Marks: 50

Section A — 1 Mark (1 × 10 = 10)

1. What is photosynthesis? 2. Name the green pigment in plant leaves. 3. What vitamin deficiency causes scurvy? 4. Name two bryophytes. 5. What is the largest phylum in the Animal Kingdom? 6. Define a reflex action. 7. Name the two main divisions of the nervous system. 8. What is the function of the cerebellum? 9. What is a synapse? 10. Define malnutrition.

Section B — 3 Mark (3 × 5 = 15)

(Choose 5 of 6)

1. Explain photosynthesis with a word equation and name the raw materials and products. 2. Distinguish between bryophytes and pteridophytes with examples. 3. What are the differences between vertebrates and invertebrates? Give two examples each. 4. Draw and label the structure of a neuron. 5. Explain the reflex arc with a labelled diagram. 6. List the symptoms and causes of any two vitamin deficiency diseases.

Section C — 5 Mark (5 × 3 = 15)

(Choose 3 of 4)

1. Describe the classification of the Plant Kingdom from Thallophyta to Angiosperms. Give one example for each division. 2. Describe the structure and function of the human nervous system — include CNS, PNS, and reflex arcs. 3. Explain the modes of nutrition in plants — autotrophic and heterotrophic (with examples of insectivorous, parasitic, and saprophytic plants). 4. Describe the Animal Kingdom classification — from Porifera to Mammals. Give key characteristics and one example for each major phylum.

Section D — Application Questions (10 marks)

1. Match the deficiency disease with its missing nutrient: (5 × 1 = 5)

• Night blindness — (Vitamin A)
• Scurvy — (Vitamin C)
• Rickets — (Vitamin D)
• Beriberi — (Vitamin B1)
• Anaemia — (Iron)

2. Classify the following organisms into their correct kingdom/phylum: (5 × 1 = 5)

• Hydra — (Phylum Coelenterata)
• Earthworm — (Phylum Annelida)
• Shark — (Phylum Chordata — Chondrichthyes class)
• Mushroom — (Fungi kingdom / Thallophyta)
• Fern — (Pteridophyta)

End of Biology Unit Test