CBSE X Life Processes practice questions

Question 1

Choose the correct path of urine out of the human body.

Accepted Answer

Kidney → ureter → urinary bladder → urethra

Answer

Kidney → ureter → urethra → urinary bladder

Answer

Kidney → urinary bladder → urethra → ureter

Answer

Urinary bladder → kidney → ureter → urethra

Question 2

Which respiratory pigment carries much of the oxygen in human blood?

Accepted Answer

Haemoglobin in red blood cells

Answer

Chlorophyll in platelets

Answer

Amylase in plasma

Answer

Insulin in white blood cells

Question 3

What does pepsin chiefly digest?

Accepted Answer

Proteins

Answer

Cellulose

Answer

Mineral salts

Answer

Only water

Question 4

Which set supports efficient respiratory gas exchange?

Accepted Answer

Large area,thin permeable barrier,moist surface,and a maintained concentration gradient

Answer

Small dry area and thick impermeable walls

Answer

No ventilation or blood supply

Answer

Only a thick mineral shell

Question 5

Which set gives major transport functions of blood?

Accepted Answer

Carry respiratory gases, nutrients, hormones and metabolic wastes

Answer

Carry only oxygen and no wastes

Answer

Produce all digestive enzymes

Answer

Replace all nervous signalling

Question 6

In a bell-jar experiment testing the need for CO₂ in photosynthesis, why is potassium hydroxide placed in a watch-glass?

Accepted Answer

To absorb carbon dioxide inside the jar

Answer

To release oxygen into the jar

Answer

To provide chlorophyll

Answer

To absorb all incoming sunlight

Question 7

Which sequence describes the passage of urine from kidneys to outside the body?

Accepted Answer

Kidneys→ureters→urinary bladder→urethra

Answer

Kidneys→urethra→ureters→bladder

Answer

Bladder→kidneys→urethra→ureters

Answer

Kidneys→blood vessels→urethra→bladder

Question 8

In typical CAM desert plants, when is much CO₂ taken up, and when do light-dependent photosynthetic reactions occur?

Accepted Answer

CO₂ is taken up mainly at night and stored; light-dependent reactions occur in daylight

Answer

Both happen only at night because light is unnecessary

Answer

CO₂ is taken up only through roots

Answer

Stored CO₂ eliminates the need for sunlight