Homework Practice

Printable assignment

Respiration in Organisms: Apply and Reason

Observe and Compare

Question 1mcq

A sealed jar with germinating seeds is connected to lime water. The lime water turns milky. What is the best inference?

A.The seeds are not alive.

B.The seeds are producing sand.

C.The seeds are respiring and releasing carbon dioxide.

D.Lime water turns milky only due to oxygen.

Question 2mcq

A student thinks only animals respire aerobically. Which example proves the idea incomplete?

A.A stone becomes warm in sunlight.

B.Plastic melts near heat.

C.A dry leaf is brown.

D.Germinating seeds use oxygen and release carbon dioxide.

Question 3mcq

What is anaerobic respiration?

A.Energy release from food without using oxygen

B.Breathing through nose only

C.Making food using sunlight

D.Transport of water in xylem

Question 4mcq

Why may muscles feel cramps after very hard exercise?

A.Muscles produce chlorophyll.

B.Anaerobic respiration in muscles can produce lactic acid.

C.Bones become soil.

D.Oxygen turns into sand.

Question 5mcq

Yeast makes dough rise mainly because it produces which gas during anaerobic respiration?

A.Oxygen

B.Nitrogen only

C.Carbon dioxide

D.Chlorine

Reason Like a Scientist

Question 6mcq

Which product is commonly formed in yeast during anaerobic respiration along with carbon dioxide?

A.Starch only

B.Oxygen only

C.Clay

D.Alcohol

Question 7mcq

A student says anaerobic respiration releases no energy because oxygen is absent. What is correct?

A.It releases less energy than aerobic respiration, but still releases some energy.

B.It always releases more energy than aerobic respiration.

C.It happens only in rocks.

D.It changes carbon dioxide into sunlight.

Question 8mcq

Which is the correct path of air during inhalation?

A.Lungs

ightarrow

stomach

ightarrow

heart

ightarrow

nostrils

B.Nostrils

ightarrow

trachea

ightarrow

bronchi

ightarrow

lungs

C.Nostrils

ightarrow

food pipe

ightarrow

stomach

D.Skin

ightarrow

bones

ightarrow

lungs

Question 9mcq

What is the role of the diaphragm during breathing?

A.It digests starch in the mouth.

B.It filters urine in the kidney.

C.It helps change chest cavity volume during inhalation and exhalation.

D.It transports food in phloem.

Question 10mcq

When a person inhales, what generally happens to the chest cavity?

A.It becomes smaller, forcing air in.

B.It fills with soil.

C.It stops all gas exchange.

D.It expands, helping air enter the lungs.