Grade 7 : Science - Animal Life Processes Quiz (Set 3)

Question 1

In an experiment, an Amoeba is placed in a solution that prevents the formation of pseudopodia. Which life process will be directly hindered first?

Accepted Answer

C) Ingestion of food particles

Answer

A) Respiration via diffusion

Answer

B) Reproduction by binary fission

Answer

D) Excretion of carbon dioxide

Question 2

If the pH level in the human stomach were to increase from 1.5 to 7.0, which enzyme would completely lose its functionality?

Accepted Answer

B) Pepsin

Answer

A) Salivary Amylase

Answer

C) Trypsin

Answer

D) Lipase

Question 3

Compare the respiratory efficiency of an Earthworm and a Human. Why does the Earthworm need to keep its skin moist?

Accepted Answer

D) To facilitate the diffusion of dissolved $O_2$ into the blood

Answer

A) To reduce friction during movement

Answer

B) To prevent water loss from the blood

Answer

C) To allow hemoglobin to bind with nitrogen

Question 4

A scientist measures the heart rate of four animals. Which animal is likely to have the highest resting heart rate?

Accepted Answer

A) Hummingbird ($Small\; body\; mass$)

Answer

B) Elephant ($Large\; body\; mass$)

Answer

C) Human ($Medium\; body\; mass$)

Answer

D) Crocodile (Ectothermic)

Question 5

During heavy exercise, a student experiences muscle cramps. This is due to the partial breakdown of glucose into:

Accepted Answer

C) Lactic Acid + Energy

Answer

A) $CO_2 + H_2O + Energy$

Answer

B) Alcohol + $CO_2$

Answer

D) Acetic Acid

Question 6

If the surface area of the small intestine was reduced by 50% due to a disease, what would be the primary mathematical consequence?

Accepted Answer

B) Nutrient absorption rate would significantly drop

Answer

A) Digestion time would decrease by half

Answer

C) Egestion would stop completely

Answer

D) Bile production would double

Question 7

Which blood vessel has the thickest muscular wall to withstand the high pressure of blood being pumped by the heart?

Accepted Answer

A) Artery

Answer

B) Vein

Answer

C) Capillary

Answer

D) Venule

Question 8

In the human circulatory system, where does the blood become oxygenated?

Accepted Answer

D) Alveoli of Lungs

Answer

A) Right Atrium

Answer

B) Left Ventricle

Answer

C) Pulmonary Artery

Question 9

Which of the following is the correct sequence of the flow of nitrogenous waste in the human excretory system?

Accepted Answer

C) Kidney $\rightarrow$ Ureter $\rightarrow$ Bladder $\rightarrow$ Urethra

Answer

A) Kidney $\rightarrow$ Urethra $\rightarrow$ Ureter $\rightarrow$ Bladder

Answer

B) Bladder $\rightarrow$ Ureter $\rightarrow$ Kidney $\rightarrow$ Urethra

Answer

D) Ureter $\rightarrow$ Kidney $\rightarrow$ Bladder $\rightarrow$ Urethra

Question 10

A person consumes a meal rich in fats. Which organ will release a substance to emulsify these fats for better digestion?

Accepted Answer

B) Liver

Answer

A) Pancreas

Answer

C) Stomach

Answer

D) Salivary Gland

Question 11

Fish use gills for respiration. How do gills maximize oxygen uptake from water?

Accepted Answer

D) By using a counter-current flow and large surface area of lamellae

Answer

A) By keeping the water stagnant

Answer

B) By decreasing the number of blood vessels

Answer

C) By absorbing water into the blood

Question 12

What is the ratio of chambers in a Fish heart to a Human heart?

Accepted Answer

A) $1:2$

Answer

B) $2:3$

Answer

C) $1:1$

Answer

D) $3:4$

Question 13

If you count your pulse for 15 seconds and find 18 beats, what is your heart rate in beats per minute (bpm)?

Accepted Answer

C) $72\; bpm$

Answer

A) $54\; bpm$

Answer

B) $60\; bpm$

Answer

D) $90\; bpm$

Question 14

In ruminants like cows, what is the specific role of the 'Rumen'?

Accepted Answer

B) To store swallowed grass and allow bacteria to break down cellulose

Answer

A) To absorb water from undigested food

Answer

C) To secrete hydrochloric acid for protein digestion

Answer

D) To grind food using small stones

Question 15

During inhalation, what happens to the diaphragm and the volume of the chest cavity?

Accepted Answer

A) Diaphragm contracts (moves down), Volume increases

Answer

B) Diaphragm relaxes (moves up), Volume increases

Answer

C) Diaphragm contracts, Volume decreases

Answer

D) Diaphragm relaxes, Volume decreases

Question 16

Which component of blood is responsible for forming a 'mesh' to stop bleeding at a wound site?

Accepted Answer

D) Platelets

Answer

A) Red Blood Cells

Answer

B) White Blood Cells

Answer

C) Plasma Proteins only

Question 17

Dialysis is a treatment for people whose kidneys have failed. It works on the principle of:

Accepted Answer

C) Diffusion across a semi-permeable membrane

Answer

A) Active transport

Answer

B) Phagocytosis

Answer

D) Osmosis of water into the blood

Question 18

Why does a person's breathing rate increase during running?

Accepted Answer

B) To provide more $O_2$ to cells for rapid energy release

Answer

A) To cool down the internal body temperature

Answer

C) To decrease the heartbeat rate

Answer

D) To absorb more nitrogen for muscle building

Question 19

Insects like cockroaches have a network of tubes for gas exchange. These tubes are called:

Accepted Answer

A) Tracheae

Answer

B) Bronchioles

Answer

C) Spiracles

Answer

D) Gills

Question 20

Which of the following is NOT a characteristic of life processes in animals?

Accepted Answer

D) Production of food via photosynthesis

Answer

A) Sensitivity to stimuli

Answer

B) Need for nutrition

Answer

C) Excretion of metabolic waste