Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Chemical Coordination and Integration — 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.
Coordination using chemical messengers is done by the:
- A.Nervous system
- B.Endocrine system
- C.Skeletal system
- D.Muscular system
2.
A hormone is carried from a gland to its target by the:
- A.Nerves
- B.Blood
- C.Bones
- D.Air
3.
Endocrine glands are called ductless because they:
- A.Have many ducts
- B.Release hormones directly into blood
- C.Make bile
- D.Store fat
4.
Compared with nervous control, hormonal control is:
- A.Faster and shorter-lasting
- B.Slower and longer-lasting
- C.Electrical
- D.Instant and brief
5.
The 'master gland' is the:
- A.Thyroid
- B.Pituitary
- C.Pancreas
- D.Adrenal
6.
Thyroxine, which controls metabolism, is made by the:
- A.Thyroid gland
- B.Pituitary gland
- C.Pancreas
- D.Ovary
7.
Insulin and glucagon, which control blood sugar, are made by the:
- A.Liver
- B.Pancreas
- C.Adrenal gland
- D.Thyroid
8.
The 'fight-or-flight' hormone is:
- A.Insulin
- B.Adrenaline
- C.Thyroxine
- D.Oestrogen
9.
The male sex hormone made by the testes is:
- A.Oestrogen
- B.Testosterone
- C.Insulin
- D.Adrenaline
10.
Growth hormone is secreted by the:
- A.Pituitary gland
- B.Pancreas
- C.Adrenal gland
- D.Ovary
11.
A hormone affects only its target organ because those cells have matching:
- A.Ducts
- B.Receptors
- C.Enzymes only
- D.Vacuoles
12.
Too little insulin (or poor response to it) causes:
- A.Goitre
- B.Diabetes mellitus
- C.Dwarfism
- D.Anaemia
13.
Goitre (thyroid swelling) is usually caused by a lack of:
- A.Iron
- B.Iodine
- C.Calcium
- D.Sodium
14.
Too little growth hormone in childhood causes:
- A.Gigantism
- B.Dwarfism
- C.Diabetes
- D.Goitre
15.
The amount of each hormone is kept in balance by:
- A.Feedback control
- B.Digestion
- C.Breathing
- D.Reflexes
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
After a sugary meal, insulin lowers blood glucose mainly by causing cells to:
- A.Take up glucose from the blood
- B.Release glucose into the blood
- C.Stop using glucose
- D.Make more sugar
17.
A frightened person's heart races because of a sudden release of:
- A.Adrenaline
- B.Insulin
- C.Thyroxine
- D.Oestrogen
18.
Adding iodine to table salt helps prevent goitre because iodine is needed to make:
- A.Thyroxine
- B.Insulin
- C.Adrenaline
- D.Growth hormone
19.
Although hormones circulate everywhere, a hormone acts on just one organ because only that organ's cells have the right:
- A.Receptors
- B.Ducts
- C.Blood vessels
- D.Nerves
20.
Damage to the pituitary could disturb many body functions because it:
- A.Controls several other endocrine glands
- B.Makes blood
- C.Digests food
- D.Filters urine
21.
Both the nervous and endocrine systems are needed because together they provide:
- A.Fast short-term and slow long-term coordination
- B.Only fast control
- C.Only digestion
- D.Only movement
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Endocrine system
- (B) Blood
- (B) Release hormones directly into blood
- (B) Slower and longer-lasting
- (B) Pituitary
- (A) Thyroid gland
- (B) Pancreas
- (B) Adrenaline
- (B) Testosterone
- (A) Pituitary gland
- (B) Receptors
- (B) Diabetes mellitus
- (B) Iodine
- (B) Dwarfism
- (A) Feedback control
Section B — Challenge / Olympiad (2 marks each)
- (A) Take up glucose from the blood
- (A) Adrenaline
- (A) Thyroxine
- (A) Receptors
- (A) Controls several other endocrine glands
- (A) Fast short-term and slow long-term coordination
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