TS 10th Class Biology Question Paper June 2025

Students must rely on TS 10th Class Biology Model Papers TS 10th Class Biology Model Paper june 2025 to gauge their understanding of exam patterns.

TS 10th Class Biology Question Paper June 2025

Parts – A and B

Time : 1 hour 30 min.
Max. Marks : 40

Instructions :

1. Read the question paper carefully and understand.
2. Answer the questions under Part – A in the answer sheet provided.
3. Part – A contains three sections – Section – I, II and III.
4. Part – B answers should be written in the given brackets and attach to the Part – A answer sheet.
5. Write the answers following the instructions given in each section.

Part – A
Section – I (3 × 2 = 6)

Time : 1.15 hrs.
Marks : 30

Instructions :
i) This section contains 3 very short answer questions.
ii) Anwer ALL the questions.
iii) Write the answers in 3 – 4 sentences.
iv) Each question carries 2 marks.

Question 1.
Write the two chemicals required in the experiment conducted to observe anaerobic respiration by using glucose solution and yeast.
Answer:
1) Diazine Green : To know whether oxygen is present or not in glucose solution.
2) Liquid paraffin : To prevent supply of air to the boiled glucose solution.
3) Lime water: To know the release of CO₂ during the experiment. If CO₂ is released, the lime water will be turned into milky white.

Question 2.
Write any two artificial vegetative propagation methods that would help to produce plants in daily life.
Answer:
Artificial vegetative propagation method that would help to produce a variety of plants are
1) Cuttings : Eg. Rose, Hibiscus
2) Layering : Eg. Nerium, Jasmine . .
3) Grafting : Eg. Mango, Citrus, Apple

Question 3.
What would happen if freshwater lakes are polluted?
Answer:
1) Humanbeings would suffer from scarcity of drinking water.
2) Many communicable diseases would spread in the surrounding villages of the lake.
3) The lake ecosystem would be disturbed, and this leads to the ecological imbalance.

Section – II (3 × 4= 12 M)

Question 4.
Write about the different steps of blood coagulation.
Answer:
Coagulation of blood : Blood forms clots to block the bleeding blood from wounds.

1. When the blood oozes out from the wound, the platelets release an enzyme called thromboki-nase.
2. Thrombokinase acts on another substance present in the blood called prothrombin converting it into thrombin.
3. Thrombin acts on another substance called fibrin, that is present in dissolved state converting it into insoluble fibrin.
4. The blood cells entangle in the fibrin fibers forming the clot.
5. The fibrin fibers are attached to the edges of the wound and pull them together.

Question 5.
Write any four vestigial organs present in your body.
Answer:
1) There are nearly 180 vestigial organs in humanbeings. Some of them are
a) Pinna
b) Hair on skin
c) Mammary glands in male
d) Appendix

2) Hence, human being is said to be “a moving museum of vestigial organs”.

Question 6.
Observe the table and answer, the following questions :
i) What changes does the effect of adrenaline cause in the body?
Answer:
Increase in heart beat rate, dialation of pupil, dialation of coronary artery.

ii) Which endocrine gland is associated with the digestive system?
Answer:
Pancrease

iii) Which hormone deficiency causes dwarfism?
Answer:
Somatotropin

iv) What happes if pituitary gland does not secrete vasopressin?
Answer:
It leads to failure in regulation of absorption of water in kidneys. It results in a disease called ‘diabetes incipidus’in which more frequent diluted urination is occured.

Section – III (2 × 6 = 12 M)

Question 7.
Write about any three secondary metabolites produced in plants and mention their uses.
Answer:
Secondary metabolities that are used in daily life.

1. Alkaloids:
   • Quinine : Used as antimalarial drug
   • Nicotine : Used as insecticide
   • Morphine/Cocaine : Used as pain killer.
   • Reserplne : Used as medicine for high B.P. and snake bite
   • Caffeine : Stimulant of nervous system.
   • Nimbin : Used as antispetic
   • Scopolamine : Used as sedalive
   • Pyrethroids : Used as insecticides
2. Tannins : Used in leather industry and medicines
3. Resins: Used in varnishes
4. Gums : Used as binding agent, medicines and food material
5. Latex : Used in rubber preparation

Question 8.
Draw a labelled diagram of embryo sac in angiosperms and explain the changes that occur in embryo sac after fertilization.
Answer:

Changes after fertilization:

1. Ovary develops into fruit.
2. Ovules develop into seeds.
3. The remaining floral parts may shrivel and fall off.

Question 9.
Explain the experimental procedure of the experiment “action of saliva on starch”. Mention the result.
Answer:
Experiment to understand action of saliva on flour.
Aim : To demonstrate the action of saliva on flour.
Apparatus : Test tubes (2), flour, watch glass, dilute tincture iodine, saliva (1 teaspoonful)

Procedure :

1. Take a test tube half-filled with water and add a pinch of flour to it.
2. Shake the test tube well till the flour gets mixed
3. Take a few drops of this mixture in a watch glass and test for the presence of starch by putting a drop of dilute tincture iodine in it.
4. A bluish black colour confirms the presence of starch.
5. Now again dissolve a pinch of flour into half-filled water in a test tube.
6. Now divide the mixture into two equal halves by transferring it to another test tube.
7. Note that both the test tubes have the same amount of solution.
8. Add a teaspoon of saliva to one of the test tube and mark. it.
9. Do not add anything in the other test tube.
10. After 45 minutes add a drop of dilute tincture iodine solution to test tubes containing the solu-tion.

Observation :

1. The solution of the test tube to which saliva is added shows colour change as starch is converted to sugar.
2. There is no colour change in the other test tube to which saliva is not added.

Inference (or) result:
The enzyme salivary amylase in the saliva breaks down the starch molecules into smaller sub-units of sugars.

Part – B

Time : 15 minutes
Marks : 10

Instructions :
i) Answer ALL the questions.
ii) Each question carries 1 mark.
iii) Each question has four options (A), (B), (C) and (D) for each question. Select the correct option and
write it in the bracket given inffont of the question.
iv) Part-B answer should be written in the question paper and attach it to Part-A answer sheet.
v) Marks will not be given for overwriting rewritten or erased answers.

Question 1.
Identify the enzyme that acts upon carbohydrates from the following. (  )
1) Lipase
2) Trypsin
3) Pepsin
4) Amylase
Answer:
1) Lipase

Question 2.
Identify the correct words that should be in the blanks shown below in a sequential order

1) Epiglottis, Trachea
2) Trachea, Nasal cavity
3) Nasal cavity, Epiglottis
4) Nasal cavity, Trachea .
Answer:
2) Trachea, Nasal cavity

Question 3.
Identify the structural and functional unit of kidney. (  )
1) Neuron
2) Nephron
3) Alveoli
4) Blood capillary
Answer:
2) Nephron

Question 4.
Identify the incorrect pair from the following. (  )
1) Saprophytic nutrition – Mushroom
2) Parasitic nutrition – Yeast
3) Autotrophic nutrition – Neem
4) Heterotrophic nutrition – Leech
Answer:
4) Heterotrophic nutrition – Leech

Question 5.
Identify the incorrect sentence regarding combusition from the following. (  )
1) Heat energy must be supplied from outside.
2) Combustion occur even in the presence of water.
3) It is an uncontrolled process.
4) If it is happened in our cells, all cells would be burnt.
Answer:
3) It is an uncontrolled process.

Question 6.
Match the following and identify the correct answer from the following. (  )
i) Regeneration
ii) Parthenogenesis
iii) Fission
iv) Fragmentation

a) Honeybee
b) Spirogyra
c) Planaria
d) Paramoecium

1) i, iii, iv, ii
2) ii, iv, i, iii
3) ii, i, iv, iii
4) iv, iii, i, ii
Answer:
2) ii, iv, i, iii

Question 7.
Identify the correct sequence of the steps involved in the process of urine formation. (  )
i) Tubular secretion
ii) Glomerular filtration
iii) Formation of hypertonic urine
iv) Tubular reabsorption
Answer:
iii) Formation of hypertonic urine

Question 8.
Identify the materials required in the experiment to prove root pressure from the following. (  )
1) Mint plant and bell jar
2) Beaker and Hydrilla plant
3) Potted plant and plastic cover
4) Potted plant and glass tube
Answer:
2) Beaker and Hydrilla plant

Question 9.
Identify the odd one from the following based on its origin. (  )
1) Glucagon
2) Ethylene
3) Auxins
4) AbscisicAcid
Answer:
4) AbscisicAcid

Question 10.
Identify the labelled part with question tag. (  )

1) Mitochondria
2) Acrosome
3) Head
4) Nucleus
Answer:
2) Acrosome