❤ BIOLOGY FINALS QUESTION PAPER SOLVED - 2024-25
Grade 6 Biology Yearly Examination.
NATIONAL PUBLIC SCHOOL BENGALURU
2024-25 YEARLY EXAMINATION BIOLOGY
Grade: 6 Max. Marks: 50 No. of pages: 4 Time: 2½ hrs.
General Instructions:
All questions are compulsory.
This question paper comprises 26 questions.
Questions 1-5 are multiple choice questions. Each question carries 1 mark.
Questions 6-10 carry 1 mark.
Questions 11-20 carry 2 marks.
Questions 21-25 carry 3 marks.
Question 26 carries 5 marks.
Section I: Multiple Choice Questions (1 Mark Each)
1. What is the primary component found in the nucleoplasm of a cell?
What is the primary component found in the nucleoplasm of a cell?
A. Mitochondria
B. Chloroplasts
C. Cytoplasm
D. Chromatin and nucleolus
Answer: D. Chromatin and nucleolus
2. Blood pressure is
A. the pressure of blood on the heart muscles
B. the pressure of blood exerted on the walls of arteries and veins
C. the pressure of blood on the walls of veins only
D. the pressure of blood on the walls of arteries only
Answer: B. the pressure of blood exerted on the walls of arteries and veins.
3. The common passage for food and air is termed as:
A. larynx
B. bronchi
C. pharynx
D. bronchioles
Answer: C. pharynx
4. Which of the following feature primarily helps the penguins retain heat in freezing temperatures.
A. Feet
B. Wings
C. Blubber
D. Beak
Answer: C. Blubber
5. The yellowing of teeth that occurs due to the formation of a sticky layer of saliva, food particles and bacteria is called
A. cavity formation
B. mouth sores
C. plaque
D. tooth decay
Answer: C. plaque
Section II: Short Answer Questions (1 Mark Each)
6. Complete the analogy:
a. Site of protein synthesis: ribosome :: Cell division: _____________.
Centrosome/Centriole
7. Define pulse.
Answer: Pulse is the rhythmic expansion and contraction of an artery as blood is pumped through it by the heart. It can typically be felt at the wrist or neck.
8. Nishant came to school when he was suffering from chicken pox. The school nurse advised him to take rest at home. Give reasons.
Answer: Chicken pox is a highly communicable disease caused by a virus. Nishant was advised to stay home to prevent the spread of the virus to other students and to allow his body to recover.
9. Identify the incorrect statement and rewrite it correctly.
a. There are no valves between the two auricles.
b. The ventricles receive the blood from different parts of the body.
a. There are no valves between the two auricles.
(This is actually correct; valves are between auricles and ventricles)
b. The ventricles receive the blood from different parts of the body. Incorrect Statement:
Corrected Statement: The auricles (atria) receive blood from different parts of the body, while ventricles pump blood out of the heart.
10. In the questions given below, there are two statements marked as Assertion (A) and Reason (R). Read the statements and choose the correct answer. A. Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct explanation of Assertion (A)
B. Both Assertion (A) and Reason (R) are correct, but Reason (R) is not the correct explanation of Assertion (A).
C. Assertion (A) is true, but Reason (R) is false.
D. Assertion (A) is false, but Reason (R) is true.
Assertion (A): The trachea is supported by C-shaped rings of cartilage.
Reason (R): Cartilage rings prevent the trachea from collapsing in the absence of air.
Answer: A. Both Assertion (A) and Reason (R) are correct, and Reason (R) is the correct explanation of Assertion (A).
Section III: 2-Mark Questions
11. What are degenerative diseases? Give two examples.
Answer: Degenerative diseases are conditions where the function or structure of the affected tissues or organs changes for the worse over time due to wear and tear or aging.
Examples: Arthritis, Alzheimer's disease, or Cardiovascular diseases.
12. Constant high blood pressure is harmful. Justify.
Answer: Constant high blood pressure (hypertension) puts excessive strain on the heart and the walls of the arteries. Over time, this can lead to serious health issues like heart attacks, kidney damage, or strokes.
13. Define vaccine. Name any two common vaccines.
Answer: A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease, usually by mimicking an infection.
Examples: BCG vaccine (for Tuberculosis), Polio vaccine (OPV), or MMR vaccine.
14. Draw human respiratory system. Label the following parts:
a. Pair of large, spongy and elastic organs: Lungs
b. Gaseous exchange takes place in them: Alveoli
15. An animal X lives under water. It is an important source of food particularly in coastal areas. The food from animal X is very rich in nutrient Y that helps in growth. The liver oil of X is rich in a particular vitamin. The animal X also contains a mineral Z which prevents goitre in humans.
a. Identify the animal X.
b. What is the food nutrient Y obtained from it?
c. Name the vitamin found in liver oil of X.
d. What is the mineral Z?
Case Study: Animal X (Fish)
a. Animal X: Fish (specifically oily fish like Cod or Shark)
b. Nutrient Y: Protein
c. Vitamin: Vitamin A (or Vitamin D)
d. Mineral Z: Iodine (which prevents goitre)
Section IV: 3-Mark Questions
16. Give reasons:
a. Water should not be allowed to stagnate: Stagnant water serves as a breeding ground for mosquitoes that spread diseases like Malaria and Dengue.
b. Items such as towels should not be shared: Sharing personal items can transfer skin infections, fungi, or bacteria from one person to another.
17. Mention any four symptoms of Kwashiorkor.
- Swollen abdomen (potbelly).
Thinning of hair and change in hair color (reddish).
Skin becomes dark and scaly.
Stunted growth and swelling of legs (edema).
18. How does a camel survive for many days without food or water?
Food: It stores fat in its hump, which can be metabolized into energy and water when food is scarce.
Water: It minimizes water loss by producing very little urine, dry dung, and not sweating until body temperatures become very high.
19. Describe any four ways by which one can take care of their eyes.
Avoid reading in very dim or very bright light.
Wash eyes regularly with clean, cold water.
Keep a safe distance from the screen while watching TV or using a computer or phone.
Eat a diet rich in Vitamin A (e.g., carrots, leafy greens).
20. Differentiate between arteries and veins with respect to
a. location
b. function
a) Location
- Deep-seated in the body.
- Located closer to the skin surface.
b) Function
- Carry oxygenated blood away from the heart to the body.
- Carry deoxygenated blood from the body back to the heart.
21. Case Study: Nisha (High Blood Sugar)
a. Symptoms: Excessive thirst, frequent urination, fatigue, and blurred vision
b. Organ/Hormone: Pancreas; Insulin.
c. Dietary Habits: Consuming excessive sugar, processed carbohydrates, and a lack of fiber-rich foods.
22. Cell Examination:
a. Cell A: Plant Cell; Cell B: Animal Cell.
b. Green structures: Chloroplasts; Thick covering: Cell wall.
c. Prediction: If nuclei are absent, the cell cannot reproduce or control its activities and will die. If mitochondria are absent, the cell will not be able to produce energy (ATP) and will cease to function.
23. Rahul's Wound:
a. Component: Platelets.
b. Scientific name: Thrombocytes.
c. Other types: 1. Red Blood Corpuscles (Erythrocytes): Carry oxygen.
2. White Blood Corpuscles (Leukocytes): Fight infections/immunity.
24. Differentiate based on criteria:
a. CO₂ in Inhaled/Exhaled air: Inhaled air has very low CO₂ ($0.04\%$), while exhaled air has much higher CO₂ (about $4\%$).
b. Respiration Products: Aerobic results in $CO_{2}$, water, and high energy; Anaerobic (in animals) results in Lactic acid and low energy.
c. Movement of ribs: During inhalation, ribs move upwards and outwards; during exhalation, ribs move downwards and inwards.
25. Case Study: Anil (Respiratory Disease)
a. Disease/Microorganism: Tuberculosis (TB); caused by the bacterium Mycobacterium tuberculosis.
b. Spread: Through the air via droplets when an infected person coughs or sneezes.
c. Precaution: Anil should cover his mouth while coughing and wear a mask.
d. Prevention: Vaccination with the BCG vaccine.
Comments
Post a Comment