Vidaara.orgClass 10 · Mathematics
CodeVID-M10-WS
Life Processes — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
Which of these is NOT a life process?
- A.Nutrition
- B.Respiration
- C.Excretion
- D.Rusting
2.
Organisms that prepare their own food are called:
- A.Heterotrophs
- B.Autotrophs
- C.Parasites
- D.Saprotrophs
3.
The raw materials for photosynthesis are:
- A.Oxygen and glucose
- B.Carbon dioxide and water
- C.Urea and water
- D.Nitrogen and oxygen
4.
Gaseous exchange in a leaf takes place through the:
- A.Stomata
- B.Xylem
- C.Phloem
- D.Nephron
5.
Salivary amylase begins the digestion of:
- A.Proteins
- B.Fats
- C.Starch
- D.Vitamins
6.
The enzyme pepsin, which digests proteins, acts in the:
- A.Mouth
- B.Stomach
- C.Large intestine
- D.Liver
7.
Bile, which helps digest fats by emulsification, is produced by the:
- A.Pancreas
- B.Liver
- C.Stomach
- D.Kidney
8.
The finger-like projections that increase surface area for absorption in the small intestine are:
- A.Alveoli
- B.Nephrons
- C.Villi
- D.Neurons
9.
Aerobic respiration takes place in the:
- A.Nucleus
- B.Mitochondria
- C.Cell wall
- D.Vacuole
10.
Anaerobic respiration in yeast produces ethanol and:
- A.Lactic acid
- B.Carbon dioxide
- C.Oxygen
- D.Urea
11.
Exchange of gases in the lungs occurs in the:
- A.Trachea
- B.Bronchi
- C.Alveoli
- D.Bronchioles
12.
The human heart has how many chambers?
- A.Two
- B.Three
- C.Four
- D.One
13.
In plants, food prepared in the leaves is transported by the:
- A.Xylem
- B.Phloem
- C.Stomata
- D.Roots only
14.
The basic filtering unit of the kidney is the:
- A.Nephron
- B.Neuron
- C.Villus
- D.Alveolus
15.
The main nitrogenous waste excreted in human urine is:
- A.Glucose
- B.Urea
- C.Protein
- D.Starch
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
A potted plant is kept in the dark for 48 hours and then a leaf is tested with iodine. It does not turn blue-black because:
- A.No starch was made without light (photosynthesis stopped)
- B.Starch was made faster
- C.Iodine does not work in the dark
- D.The leaf turned green
17.
Why is the wall of the left ventricle thicker than that of the right ventricle?
- A.It pumps blood to the whole body, against greater resistance
- B.It pumps blood only to the lungs
- C.It stores more food
- D.It filters blood
18.
An athlete breathes faster and deeper during a race mainly to:
- A.Supply more oxygen for aerobic respiration in muscles
- B.Remove starch
- C.Cool the lungs
- D.Make more urea
19.
Reabsorption of glucose and most water in the nephron ensures that:
- A.Useful substances are not lost in urine
- B.More urea is made
- C.Blood pressure falls to zero
- D.Digestion is completed
20.
Transpiration is useful to a plant because, besides cooling it, it mainly helps to:
- A.Pull water and minerals up through the xylem
- B.Make food
- C.Store starch
- D.Digest proteins
21.
A person whose kidneys have failed is put on dialysis. Dialysis works by:
- A.Filtering wastes like urea out of the blood artificially
- B.Adding urea to the blood
- C.Digesting food
- D.Making the heart beat
Answer Key
Section A — Multiple Choice (1 mark each)
- (D) Rusting
- (B) Autotrophs
- (B) Carbon dioxide and water
- (A) Stomata
- (C) Starch
- (B) Stomach
- (B) Liver
- (C) Villi
- (B) Mitochondria
- (B) Carbon dioxide
- (C) Alveoli
- (C) Four
- (B) Phloem
- (A) Nephron
- (B) Urea
Section B — Challenge / Olympiad (2 marks each)
- (A) No starch was made without light (photosynthesis stopped)
- (A) It pumps blood to the whole body, against greater resistance
- (A) Supply more oxygen for aerobic respiration in muscles
- (A) Useful substances are not lost in urine
- (A) Pull water and minerals up through the xylem
- (A) Filtering wastes like urea out of the blood artificially
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