CLASS IX — BIOLOGY (THEORY) — ANNUAL EXAMINATION PRACTICE PAPER (2026–2027)

Maximum Marks: 80 | Time Allowed: Two hours

Instructions to Candidates

Answers to this paper must be written on the paper provided separately.
You will not be allowed to write during the first 15 minutes.
This time is to be spent in reading the question paper.
The time given at the head of this paper is the time allowed for writing the answers.

Section A is compulsory. Attempt any four questions from Section B.
The intended marks for questions or parts of questions are given in brackets [ ].

Syllabus: Full Class IX book — Basic Biology (cell, tissues), Flowering Plants, Plant Physiology, Diversity in Living Organisms, Human Anatomy and Physiology, Health and Hygiene, Waste Generation and Management.

SECTION A

(Attempt all questions from this Section.)

Question 1 [15]

Choose the correct answers to the questions from the given options.

(i) The cell organelle known as the 'suicide bag' of the cell is the:
(a) Golgi body
(b) ribosome
(c) lysosome
(d) centrosome

(ii) Assertion (A): Plant cells have a definite and rigid shape.
Reason (R): Plant cells have a cellulose cell wall outside the cell membrane.
(a) (A) is true and (R) is false.
(b) (A) is false and (R) is true.
(c) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(d) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(iii) The plant tissue that has lignified walls and provides mechanical strength is:
(a) parenchyma
(b) collenchyma
(c) sclerenchyma
(d) meristem

(iv) A flower that has both androecium and gynoecium is called:
(a) unisexual
(b) bisexual
(c) incomplete
(d) ebracteate

(v) In triple fusion, one male gamete fuses with:
(a) the egg cell
(b) the two polar nuclei
(c) the synergids
(d) the antipodal cells

(vi) A seed that has only one cotyledon is:
(a) bean
(b) maize
(c) gram
(d) pea

(vii) The end product of anaerobic respiration in human muscle cells is:
(a) ethyl alcohol and carbon dioxide
(b) lactic acid
(c) carbon dioxide and water
(d) glucose

(viii) The cell wall of fungi is made up of:
(a) cellulose
(b) peptidoglycan
(c) chitin
(d) lignin

(ix) The bacteria that convert ammonia into nitrites and then into nitrates are called:
(a) nitrogen-fixing bacteria
(b) nitrifying bacteria
(c) denitrifying bacteria
(d) decomposing bacteria

(x) A lack of iodine in the diet causes:
(a) goitre
(b) anaemia
(c) rickets
(d) scurvy

(xi) The total number of molar teeth in an adult human is:
(a) 4
(b) 8
(c) 12
(d) 16

(xii) The enzyme in saliva (salivary amylase) converts:
(a) proteins into amino acids
(b) starch into maltose
(c) fats into fatty acids
(d) sucrose into glucose

(xiii) The joint between the atlas and the axis vertebrae is a:
(a) hinge joint
(b) ball and socket joint
(c) pivot joint
(d) gliding joint

(xiv) Assertion (A): Vasodilation helps to cool the body when it is hot.
Reason (R): The blood vessels near the skin surface widen, so more blood flows there and more heat is lost.
(a) (A) is true and (R) is false.
(b) (A) is false and (R) is true.
(c) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(d) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(xv) Electrostatic precipitators are used in industries to remove:
(a) liquid effluents
(b) particulate matter from smoke
(c) plastic wastes
(d) excess heat

Question 2

(i) Name the following: [5]
(a) The cell organelle that is the site of aerobic respiration.
(b) The tissue that transports food in plants.
(c) The part of the pistil that develops into a fruit after fertilisation.
(d) The wave-like contractions of the alimentary canal that push the food forward.
(e) The disease caused by a deficiency of protein and calories in infants, in which the child becomes very thin and shrivelled.

(ii) Arrange and rewrite the terms in each group in the correct order so as to be in a logical sequence beginning with the term that is underlined. [5]

(a) Glucose, Krebs cycle, pyruvic acid, carbon dioxide and water
(b) Pollination, fertilisation, pollen tube formation, germination of pollen grain
(c) Ingestion, absorption, digestion, assimilation
(d) Atmospheric nitrogen, nitrates, ammonia, nitrites
(e) Nasal cavity, trachea, larynx, bronchus, pharynx

(iii) Match the items given in Column I with the most appropriate ones in Column II and rewrite the correct matching pairs. [5]

COLUMN I	COLUMN II
(a) Lysosomes	(a) Protein deficiency disease
(b) Sclerenchyma	(b) Develops into the shoot
(c) Plumule	(c) Digest worn-out cell organelles
(d) Pepsin	(d) Digests proteins in an acidic medium
(e) Kwashiorkor	(e) Dead cells with lignified walls for support
	(f) Develops into the root
	(g) Cause of rickets
	(h) Secretes sebum

(iv) Choose the odd one out from the following terms and name the category to which the others belong: [5]
(a) Thallophyta, Bryophyta, Pteridophyta, Monera
(b) Cholera, Typhoid, Tuberculosis, Malaria
(c) Sweat gland, Sebaceous gland, Mammary gland, Thyroid gland
(d) Hinge joint, Ball and socket joint, Pivot joint, Skull sutures
(e) Plastic, Glass, Styrofoam, Vegetable peels

(v) Fill in the blanks with suitable words: [5]
(a) The fusion of one male gamete with two polar nuclei is called ______.
(b) Deficiency of vitamin C in the diet causes a disease called ______.
(c) The ______ muscles, along with the diaphragm, bring about breathing movements.
(d) Glycolysis takes place in the ______ of the cell.
(e) In a sewage treatment plant, the solid particles settle down during the ______ treatment, while microorganisms digest the organic matter during the secondary treatment.

SECTION B

(Attempt any four questions from this Section.)

Question 3

(i) Name the scientists who proposed the cell theory. [1]
(ii) State two functions of the nucleus. [2]
(iii) State two differences between a prokaryotic cell and a eukaryotic cell. [2]
(iv) State two differences between xylem and phloem. [2]
(v) Differentiate between a plant cell and an animal cell on any three points. [3]

Question 4

(i) Name the whorl of a flower that is made up of petals. [1]
(ii) What are complete and incomplete flowers? Give one example of each. [2]
(iii) State any two advantages of cross-pollination. [2]
(iv) What is triple fusion? State its significance. [2]
(v) State any three characteristics of insect-pollinated flowers. [3]

Question 5

(i) Name the type of germination seen in a bean seed. [1]
(ii) State two differences between a monocot seed and a dicot seed. [2]
(iii) State any two conditions necessary for the germination of seeds. [2]
(iv) Write the chemical equation for aerobic respiration. [2]
(v) Differentiate between aerobic and anaerobic respiration on any three points. [3]

Question 6

(i) Name the scientist who proposed the five kingdom system of classification. [1]
(ii) State two characteristic features of Kingdom Fungi. [2]
(iii) State two useful roles of bacteria in agriculture or industry. [2]
(iv) Explain the role of nitrogen-fixing bacteria in the nitrogen cycle. [2]
(v) Differentiate between Kingdom Monera and Kingdom Protista on any three points. [3]

Question 7

(i) Name the disease caused by a deficiency of vitamin D. [1]
(ii) What is a balanced diet? State why it is important. [2]
(iii) State two differences between kwashiorkor and marasmus. [2]
(iv) State the functions of (a) incisors and (b) molars. [2]
(v) Explain the role of the liver and the pancreas in digestion. [3]

Question 8

(i) Name the muscles present between the ribs that help in breathing. [1]
(ii) Explain how the skin helps to regulate the body temperature. [2]
(iii) State two differences between an antiseptic and a disinfectant. [2]
(iv) State any two functions of the human skeleton. [2]
(v) State any three methods of safe disposal of waste. [3]