🔬 CLASS 9 – BIOLOGY Annual Exam Answer Key (EM)
Summative Assessment III — Complete Answer Key
11 score
Which are the pores in the plant stem that facilitate gaseous exchange? a) Lenticels b) Vessels c) Hydathodes d) Tracheids
Answer: a) Lenticels Lenticels are the pores in the bark of woody stems that allow gaseous exchange.
2
Select the correct option by matching the information in the table. (First aid equipment → Situation)
Answer: c) p-z, q-y, r-x
match: p–z, q–y, r–x
| Equipment | Situation |
|---|---|
| p) Bandage | z) wounds, swelling, bleeding |
| q) Splint | y) fracture or dislocation |
| r) Sling | x) injury to arms/shoulders |
3
Assertion (A): Starfish belongs to phylum Echinodermata. Reason (R): It is a marine organism with a spiny body. Choose correct option.
Answer: d) Both A and R are correct; R is not the correct explanation of A.
Starfish is in Echinodermata because of spiny skin; being marine is not the defining feature.
Starfish is in Echinodermata because of spiny skin; being marine is not the defining feature.
4
Stages of foetus growth: i) Organ formation ii) Fertilization iii) Implantation iv) Zygote formation. Correct sequence?
Answer: b) ii → iv → iii → i (Fertilization → Zygote → Implantation → Organ formation)
52 scores
Six‑Kingdom classification: a) New kingdoms formed by dividing Monera? b) Reason for dividing Monera?
Answer:
a) Archaebacteria and Eubacteria.
b) Significant genetic/biochemical differences (cell wall, RNA sequences); Archaebacteria live in extreme environments and have different evolutionary history.
a) Archaebacteria and Eubacteria.
b) Significant genetic/biochemical differences (cell wall, RNA sequences); Archaebacteria live in extreme environments and have different evolutionary history.
6
Experiment with fresh water/salt water separated by semipermeable membrane. a) Which process? b) Is entry of oxygen into cells through same process? Why?
Answer:
a) Osmosis.
b) No. Oxygen enters cells by diffusion; osmosis is specifically movement of water molecules.
a) Osmosis.
b) No. Oxygen enters cells by diffusion; osmosis is specifically movement of water molecules.
7
"Caring attitude of family/society towards pregnant women beneficially affects health of mother and child." Do you agree? Why?
Answer: Yes. Emotional support reduces stress → better hormone regulation → healthy foetal development. Proper nutrition/care ensures safer pregnancy and delivery.
8
Analyse the child's doubt and provide correct explanation. (image related, e.g. artery/vein confusion)
Answer: Example: Child may confuse pulmonary artery/vein. Explanation: Pulmonary artery carries deoxygenated blood from heart to lungs (exception to ‘arteries carry oxygenated’). Pulmonary vein carries oxygenated blood from lungs to heart (exception to ‘veins carry deoxygenated’).
9
Arm folding movement: name muscles X and Y; change during action.
Answer:
a) X = Triceps; Y = Biceps.
b) During folding: Biceps (Y) contracts/shortens; Triceps (X) relaxes/lengthens.
a) X = Triceps; Y = Biceps.
b) During folding: Biceps (Y) contracts/shortens; Triceps (X) relaxes/lengthens.
10
Digestive juices: P (HCl), Q (salivary amylase), R (no enzymes). Identify P, Q and function of R.
Answer:
a) P = Gastric juice; Q = Saliva.
b) R = Bile (no enzymes). Function: emulsifies fats → break into small droplets for lipase action.
a) P = Gastric juice; Q = Saliva.
b) R = Bile (no enzymes). Function: emulsifies fats → break into small droplets for lipase action.
11
Child paired a muscle with organ (image). Name muscle, correct pair? Explain.
Answer: Example: smooth muscle with stomach → correct. Walls of stomach contain involuntary smooth muscles (peristalsis).
OR
B. Compare nutrition in Hydra and Amoeba (ingestion, digestion).
Answer (B):
Ingestion: Amoeba – pseudopodia engulf food. Hydra – tentacles with stinging cells push prey into mouth.
Digestion: Amoeba – intracellular (food vacuoles). Hydra – extracellular (gastrovascular cavity) + intracellular.
Ingestion: Amoeba – pseudopodia engulf food. Hydra – tentacles with stinging cells push prey into mouth.
Digestion: Amoeba – intracellular (food vacuoles). Hydra – extracellular (gastrovascular cavity) + intracellular.
123 scores
Ill effects of drugs, smoking, alcoholism on reproductive health.
Answer: Males – reduced sperm count, motility, impotence. Females – menstrual irregularity, ovulation issues, miscarriage, foetal alcohol syndrome. General – increased STI risk, hormonal imbalance.
13
A. X: xylem vessels+tracheids present; Y: cones present. a) Identify X,Y b) examples c) two more characteristics of X.
Answer (A): a) X = Angiosperms, Y = Gymnosperms. b) Angiosperms: mango, wheat; Gymnosperms: pine, cycas. c) Flowers, seeds enclosed in fruit.
OR B. Table: Human, Lungfish, Dog, Lizard. a) Similarity: both have vertebral column. b) Dog has hair, lizard has scales; Dog lactates, lizard does not. c) Lungfish comes first (most primitive, lacks hair/lactation).
OR B. Table: Human, Lungfish, Dog, Lizard. a) Similarity: both have vertebral column. b) Dog has hair, lizard has scales; Dog lactates, lizard does not. c) Lungfish comes first (most primitive, lacks hair/lactation).
14
a) Factor leading to fungal infections in genital areas during puberty. b) Clothing precautions.
Answer: a) Moisture + lack of ventilation (sweating). b) Loose cotton underwear, avoid synthetics, change daily, keep area clean & dry.
15
A. Cellular respiration: stage where 'X' (oxygen) utilised; transport of X and Y (CO₂).
Answer (A): a) Oxygen utilised in Electron transport chain (final stage). b) X transport: bound to haemoglobin (oxyhaemoglobin). Y transport: as bicarbonate in plasma, dissolved, or bound to haemoglobin.
OR B. Kidney treatment illustration: a) Haemodialysis. b) Stage 1: blood pumped from vein; Stage 2: anticoagulant added. c) In X (dialyser): diffusion – wastes move into dialysis fluid.
OR B. Kidney treatment illustration: a) Haemodialysis. b) Stage 1: blood pumped from vein; Stage 2: anticoagulant added. c) In X (dialyser): diffusion – wastes move into dialysis fluid.
16
Group with no cytoplasm, genetic material in capsid. a) Which group? b) Can it be in Six‑Kingdom classification? Why?
Answer: a) Viruses. b) No – Six‑Kingdom classification includes only cellular organisms; viruses are acellular, not considered living.
17
A. Redraw diagram, label part reducing friction. b) Disorder if immune system affects that part.
Answer (A): (Diagram: synovial joint) label cartilage or synovial membrane reduces friction. b) Rheumatoid arthritis.
OR B. Pea seed experiment: a) Thigmotropism. b) Touch stimulus. c) Tendrils sensitive to touch; cells on opposite side elongate → curls around support.
OR B. Pea seed experiment: a) Thigmotropism. b) Touch stimulus. c) Tendrils sensitive to touch; cells on opposite side elongate → curls around support.
181+1+2
A. Diagram nutrition/protection of foetus: a) temporary system from embryonic & uterine tissues? b) fluid & function. c) Nutrient exchange without blood mixing – agree? Why?
Answer (A): a) Placenta. b) Amniotic fluid – cushions, prevents sticking, constant temperature. c) Agree. Placenta allows diffusion/active transport; blood does not mix to avoid immune reactions.
OR B. Contraceptive methods X, Y. a) X = Copper‑T / IUD, Y = condom (example). b) X temporary, Y temporary (if condom) / or vasectomy if permanent. c) Agree – proper spacing ensures mother recovers, baby gets adequate care and nutrition.
OR B. Contraceptive methods X, Y. a) X = Copper‑T / IUD, Y = condom (example). b) X temporary, Y temporary (if condom) / or vasectomy if permanent. c) Agree – proper spacing ensures mother recovers, baby gets adequate care and nutrition.