Grade 7 : Science (Curiosity) - 9. Animal Life Processes (Set 1) | Concept of Maths

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, Phagocytosis

B) Paramecium, Ciliary movement

C) Hydra, Tentacular capture

D) Earthworm, Suction

Answer

Correct Answer: A

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 Acids

B) Starch into Sugars

C) Fats into Fatty Acids

D) Vitamins into Minerals

Answer

Correct Answer: B

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

Question 3

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

A) Gills

B) Lungs

C) Spiracles

D) Tracheoles

Answer

Correct Answer: C

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

Question 4

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) Plasma

B) White Blood Cells (WBC)

C) Platelets

D) Red Blood Cells (RBC)

Answer

Correct Answer: D

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 minute

B) 72 - 80 beats per minute

C) 100 - 120 beats per minute

D) 150 - 180 beats per minute

Answer

Correct Answer: B

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) Abomasum

B) Omasum

C) Rumen

D) Reticulum

Answer

Correct Answer: C

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) Arteries

B) Veins

C) Capillaries

D) Pulmonary Artery

Answer

Correct Answer: A

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) Liver

B) Urinary Bladder

C) Kidneys

D) Ureter

Answer

Correct Answer: C

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 hydrogen

B) By absorbing moisture from the air

C) By trapping air bubbles in the water

D) By absorbing oxygen dissolved in water

Answer

Correct Answer: D

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 juices

B) Increasing surface area for absorption

C) Churning the food

D) Killing bacteria

Answer

Correct Answer: B

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 out

B) Diaphragm moves up, ribs move in

C) Diaphragm moves down, ribs move in

D) Both stay stationary

Answer

Correct Answer: A

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) RBCs

B) WBCs

C) Platelets

D) Plasma

Answer

Correct Answer: C

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) Urethra

B) Ureter

C) Renal Artery

D) Alveoli

Answer

Correct Answer: B

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) Pancreas

B) Stomach

C) Gall Bladder

D) Liver

Answer

Correct Answer: D

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 $\rightarrow$ Egestion

B) Digestion $\rightarrow$ Ingestion $\rightarrow$ Assimilation $\rightarrow$ Absorption $\rightarrow$ Egestion

C) Ingestion $\rightarrow$ Absorption $\rightarrow$ Digestion $\rightarrow$ Assimilation $\rightarrow$ Egestion

D) Egestion $\rightarrow$ Assimilation $\rightarrow$ Absorption $\rightarrow$ Digestion $\rightarrow$ Ingestion

Answer

Correct Answer: A

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) Transfusion

B) Circulation

C) Dialysis

D) Fermentation

Answer

Correct Answer: C

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: B

Solution: Cellular respiration equation: $$\text{Glucose} + O_2 \rightarrow CO_2 + \text{Water} + \text{Energy}$$ 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 medium

B) To neutralize the food

C) To digest fats directly

D) To protect the stomach lining

Answer

Correct Answer: A

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 Thick

B) Hard and Scaly

C) Moist and Slimy

D) Covered with hair

Answer

Correct Answer: C

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: A

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

Grade 7 : Science (Curiosity) - 9. Animal Life Processes (Set 1) | Concept of Maths