Question 1

1. A certain unicellular organism uses temporary finger-like projections called pseudopodia to engulf food. Identify the organism and the process.

A) Amoeba, PhagocytosisB) Paramecium, Ciliary movementC) Hydra, Tentacular captureD) Earthworm, Suction

Answer

✓ Correct Answer: Option A

Explanation: Solution: Amoeba captures food by extending its cell membrane into pseudopodia (false feet) which fuse over the food particle to form a food vacuole. This process of engulfing is known as phagocytosis.

Question 2

2. In the human digestive system, the enzyme salivary\ amylase acts on which component of food?

A) Proteins into Amino AcidsB) Starch into Sugars

Question 3

3. An insect like a cockroach takes in air through small openings on the sides of its body called:

A) GillsB) LungsC) SpiraclesD) Tracheoles

Answer

✓ Correct Answer: Option C

Explanation: Solution: Insects have a network of air tubes called tracheae for gas exchange. Air enters these tubes through small openings called spiracles.

Question 4

4. During heavy exercise, our body undergoes anaerobic respiration in muscle cells. What is the product formed that causes muscle cramps?

A) Lactic Acid + EnergyB) Alcohol + $CO_2$C) Water + $CO_2$D) Acetic Acid

Answer

✓ Correct Answer: Option A

Explanation: Solution: When oxygen supply is insufficient, glucose breaks down partially: $Glucose \xrightarrow{In Muscle} Lactic Acid + Energy$ The accumulation of lactic acid leads to cramps.

Question 5

5. Blood appears red due to the presence of a pigment called Hemoglobin. In which component of blood is it primarily found?

A) PlasmaB) White Blood Cells (WBC)C) PlateletsD) Red Blood Cells (RBC)

Answer

✓ Correct Answer: Option D

Explanation: Solution: Hemoglobin is an iron-rich protein found in Red\ Blood\ Cells (Erythrocytes) that binds with oxygen and gives blood its red color.

Question 6

6. The rhythmic contraction and expansion of the heart is known as a heartbeat. What is the average resting pulse rate of an adult human?

A) 40 - 50 beats per minuteB) 72 - 80 beats per minuteC) 100 - 120 beats per minuteD) 150 - 180 beats per minute

Answer

✓ Correct Answer: Option B

Explanation: Solution: The pulse rate is the number of heartbeats per minute. For a healthy adult at rest, it typically ranges between 72 and 80 beats per minute.

Question 7

7. Which organ in ruminants (like cows) is specifically adapted to store swallowed grass before it is chewed again as 'cud'?

A) AbomasumB) OmasumC) RumenD) Reticulum

Answer

✓ Correct Answer: Option C

Explanation: Solution: Ruminants have a four-chambered stomach. The Rumen is the largest chamber where food is partially digested by bacteria and stored as 'cud'.

Question 8

8. Which blood vessel carries oxygen-rich blood away from the heart to all parts of the body?

A) ArteriesB) VeinsC) CapillariesD) Pulmonary Artery

Answer

✓ Correct Answer: Option A

Explanation: Solution: Arteries carry oxygenated blood from the heart (except the pulmonary artery). They have thick, elastic walls to withstand high pressure.

Question 9

9. Excretion in humans involves the filtration of blood. Which organ acts as the primary filter to remove nitrogenous wastes?

A) LiverB) Urinary BladderC) KidneysD) Ureter

Answer

✓ Correct Answer: Option C

Explanation: Solution: The Kidneys contain millions of filtration units called nephrons that filter blood to produce urine, removing urea and other salts.

Question 10

10. Fish use specialized organs called Gills for respiration. How do these organs help them breathe underwater?

A) By converting water into hydrogenB) By absorbing moisture from the airC) By trapping air bubbles in the waterD) By absorbing oxygen dissolved in water

Answer

✓ Correct Answer: Option D

Explanation: Solution: Gills are richly supplied with blood vessels. As water passes over the gills, the dissolved\ oxygen is absorbed into the blood and $CO_2$ is released.

Question 11

11. The inner wall of the small intestine has thousands of finger-like outgrowths. What is their primary function?

A) Secreting digestive juicesB) Increasing surface area for absorptionC) Churning the foodD) Killing bacteria

Answer

✓ Correct Answer: Option B

Explanation: Solution: These outgrowths are called villi. They increase the surface area for the absorption of digested food into the blood vessels.

Question 12

12. During inhalation, what happens to the diaphragm and the rib cage?

A) Diaphragm moves down, ribs move outB) Diaphragm moves up, ribs move inC) Diaphragm moves down, ribs move inD) Both stay stationary

Answer

✓ Correct Answer: Option A

Explanation: Solution: During inhalation, the diaphragm contracts\ and\ moves\ down, and ribs move up\ and\ out, increasing the chest cavity volume and pulling air in.

Question 13

13. Which component of human blood is responsible for the formation of a clot at the site of an injury?

A) RBCsB) WBCsC) PlateletsD) Plasma

Answer

✓ Correct Answer: Option C

Explanation: Solution: Platelets (thrombocytes) help in the clotting of blood, preventing excessive blood loss during an injury.

Question 14

14. In the human excretory system, what is the tube that carries urine from the kidneys to the urinary bladder?

A) UrethraB) UreterC) Renal ArteryD) Alveoli

Answer

✓ Correct Answer: Option B

Explanation: Solution: The Ureter is the duct that connects each kidney to the urinary bladder. The Urethra is the tube through which urine is finally expelled.

Question 15

15. Bile juice, which is essential for the digestion of fats, is produced by which organ?

A) PancreasB) StomachC) Gall BladderD) Liver

Answer

✓ Correct Answer: Option D

Explanation: Solution: The Liver produces bile juice, which is stored in the gall bladder and helps in the emulsification of fats.

Question 16

16. What is the correct sequence of steps in the process of nutrition in animals?

A) Ingestion \rightarrow Digestion \rightarrow Absorption \rightarrow Assimilation \rightarrow EgestionB) Digestion \rightarrow Ingestion \rightarrow Assimilation \rightarrow Absorption \rightarrow EgestionC) Ingestion \rightarrow Absorption \rightarrow Digestion \rightarrow Assimilation \rightarrow EgestionD) Egestion \rightarrow Assimilation \rightarrow Absorption \rightarrow Digestion \rightarrow Ingestion

Answer

✓ Correct Answer: Option A

Explanation: Solution: The logical flow of nutrition is taking food in (Ingestion), breaking it down (Digestion), taking in nutrients (Absorption), using them (Assimilation), and removing waste (Egestion).

Question 17

17. If a person's kidneys fail to function, they may undergo a process to filter their blood artificially. This process is called:

A) TransfusionB) CirculationC) DialysisD) Fermentation

Answer

✓ Correct Answer: Option C

Explanation: Solution: Dialysis is the medical process of removing waste products and excess fluid from the blood when the kidneys stop working properly.

Question 18

18. Which gas is released as a byproduct during the process of cellular respiration in animals?

A) Oxygen ($O_2$)B) Carbon Dioxide ($CO_2$)C) Nitrogen ($N_2$)D) Methane ($CH_4$)

Answer

✓ Correct Answer: Option B

Explanation: Solution: Cellular respiration equation: $$Glucose + O_2 \rightarrow CO_2 + Water + Energy$Thus,CO_2$ is the gas released.

Question 19

19. In humans, the stomach secretes mucous, enzymes, and Hydrochloric\ Acid (HCl). What is the purpose of HCl?

A) To kill bacteria and provide an acidic mediumB) To neutralize the foodC) To digest fats directlyD) To protect the stomach lining

Answer

✓ Correct Answer: Option A

Explanation: Solution: HCl kills harmful bacteria that enter with food and creates an acidic environment necessary for the protein-digesting enzyme (pepsin) to work.

Question 20

20. Earthworms breathe through their skin. For efficient gas exchange, their skin must be:

A) Dry and ThickB) Hard and ScalyC) Moist and SlimyD) Covered with hair

Answer

✓ Correct Answer: Option C

Explanation: Solution: Earthworms exchange gases directly through their moist\ skin. Dissolved oxygen from the surrounding soil air diffuses into their blood vessels.

Accepted Answer

✓ Correct Answer: Option B

Explanation: Solution: Digestion begins in the mouth where salivary\ amylase breaks down complex carbohydrates like starch into simpler sugars like maltose. $Starch \xrightarrow{Amylase} Sugar$

Grade 7 : Science (Curiosity) - 9. Animal Life Processes (Set 1)

1. A certain unicellular organism uses temporary finger-like projections called pseudopodia to engulf food. Identify the organism and the process.

2. In the human digestive system, the enzyme salivary\ amylase acts on which component of food?

3. An insect like a cockroach takes in air through small openings on the sides of its body called:

4. During heavy exercise, our body undergoes anaerobic respiration in muscle cells. What is the product formed that causes muscle cramps?

5. Blood appears red due to the presence of a pigment called Hemoglobin. In which component of blood is it primarily found?

6. The rhythmic contraction and expansion of the heart is known as a heartbeat. What is the average resting pulse rate of an adult human?

7. Which organ in ruminants (like cows) is specifically adapted to store swallowed grass before it is chewed again as 'cud'?

8. Which blood vessel carries oxygen-rich blood away from the heart to all parts of the body?

9. Excretion in humans involves the filtration of blood. Which organ acts as the primary filter to remove nitrogenous wastes?

10. Fish use specialized organs called Gills for respiration. How do these organs help them breathe underwater?

11. The inner wall of the small intestine has thousands of finger-like outgrowths. What is their primary function?

12. During inhalation, what happens to the diaphragm and the rib cage?

13. Which component of human blood is responsible for the formation of a clot at the site of an injury?

14. In the human excretory system, what is the tube that carries urine from the kidneys to the urinary bladder?

15. Bile juice, which is essential for the digestion of fats, is produced by which organ?

16. What is the correct sequence of steps in the process of nutrition in animals?

17. If a person's kidneys fail to function, they may undergo a process to filter their blood artificially. This process is called:

18. Which gas is released as a byproduct during the process of cellular respiration in animals?

19. In humans, the stomach secretes mucous, enzymes, and Hydrochloric\ Acid (HCl). What is the purpose of HCl?

20. Earthworms breathe through their skin. For efficient gas exchange, their skin must be: