Class 10 Practice Level 3 – Life Processes – Set – 1

Total questions: 15

In the process of nitrogen fixation in plants, which enzyme is crucial for the conversion of atmospheric nitrogen (N₂) into ammonia (NH₃)?

Topic: Nutrition

Nitrogenase

Amylase

Nitrate reductase

Rubisco

None

What is the role of bile salts in the digestion of fats?

Topic: Nutrition

Break down proteins

Emulsify fats

Absorb carbohydrates

Neutralize stomach acid

None

Which pathway in cellular respiration involves the conversion of glucose into pyruvate with the production of ATP and NADH?

Topic: Respiration

Glycolysis

Krebs cycle

Electron transport chain

Calvin cycle

None

In the electron transport chain, which complex is responsible for pumping protons into the intermembrane space, creating a proton gradient?

Topic: Respiration

Complex I

Complex II

Complex III

Complex IV

None

What is the Bohr effect in relation to haemoglobin and oxygen transport?

Topic: Transportation

Decreased oxygen affinity with lower pH

Increased oxygen affinity with higher pH

Decreased carbon dioxide affinity with higher pH

Increased carbon dioxide affinity with lower pH

None

Which type of blood vessel has the thickest walls and why?

Topic: Transportation

Veins, because they carry deoxygenated blood

Capillaries, because they exchange gases

Arteries, because they withstand high pressure

Venules, because they connect capillaries to veins

None

How does the countercurrent multiplier mechanism function in the kidney?

Topic: Excretion

By generating a high concentration of urine

By filtering blood at the glomerulus

By reabsorbing glucose in the proximal tubule

By producing erythropoietin

None

Which part of the nephron is impermeable to water but actively transports salts?

Topic: Excretion

Proximal convoluted tubule

Descending limb of the loop of Henle

Ascending limb of the loop of Henle

Collecting duct

None

Which coenzyme is derived from vitamin B3 (niacin) and plays a crucial role in cellular respiration?

Topic: Nutrition

Coenzyme A

NAD⁺ (Nicotinamide adenine dinucleotide)

FAD (Flavin adenine dinucleotide)

CoQ10 (Coenzyme Q10)

None

10.

Which process in plants involves the transfer of electrons from water to NADP⁺, producing NADPH and oxygen as by-products?

Topic: Nutrition

Krebs cycle

Calvin cycle

Light-dependent reactions

Glycolysis

None

11.

In which organelle does the Krebs cycle take place?

Topic: Respiration

Nucleus

Cytoplasm

Mitochondrion

Endoplasmic reticulum

None

12.

What is the primary role of cytochrome c in the electron transport chain?

Topic: Respiration

To pump protons

To carry electrons between complexes

To produce ATP

To synthesize glucose

None

13.

What is the effect of the Frank-Starling law on the heart's function?

Topic: Transportation

Increased heart rate with increased blood volume

Decreased cardiac output with decreased venous return

Increased stroke volume with increased venous return

Decreased heart rate with increased stroke volume

None

14.

Which condition results from the buildup of fatty deposits in the walls of arteries, leading to reduced blood flow?

Topic: Transportation

Hypertension

Atherosclerosis

Anaemia

Leukaemia

None

15.

How does antidiuretic hormone (ADH) affect the kidneys?

Topic: Excretion

It increases urine production

It decreases water reabsorption

It increases water reabsorption

It decreases sodium reabsorption

None

1 out of 15

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Class 10 Practice Level 3 – Life Processes – Set – 1

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