Control and Coordination in Living Organisms

Biology

This content explores how living organisms, both plants and animals, control and coordinate their responses to environmental stimuli. It details the roles of the nervous system and hormones in animals, and hormonal control in plants. Key concepts include reflex actions, the human brain's structure and function, plant tropisms (phototropism, geotropism), and the functions of various hormones like auxins, gibberellins, cytokinins, abscisic acid, adrenaline, thyroxin, growth hormone, testosterone, oestrogen, and insulin.

Nervous System Hormones Plant Growth

26 Questions Medium Ages 10+ Aug 12, 2026

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About this Study Set

This study set covers Biology through 26 practice questions. This content explores how living organisms, both plants and animals, control and coordinate their responses to environmental stimuli. It details the roles of the nervous system and hormones in animals, and hormonal control in plants. Key concepts include reflex actions, the human brain's structure and function, plant tropisms (phototropism, geotropism), and the functions of various hormones like auxins, gibberellins, cytokinins, abscisic acid, adrenaline, thyroxin, growth hormone, testosterone, oestrogen, and insulin. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 26 questions from the Control and Coordination in Living Organisms study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What are the two main systems responsible for control and coordination in animals?

A Skeletal and Muscular Systems
B Nervous and Endocrine Systems
C Circulatory and Respiratory Systems
D Digestive and Excretory Systems

2 Which plant hormone is primarily responsible for promoting cell elongation?

A Gibberellins
B Cytokinins
C Abscisic Acid
D Auxins

3 What is a reflex action?

A A conscious decision to act
B A rapid, involuntary response to a stimulus
C A slow, growth-dependent movement
D A voluntary action controlled by the brain

4 Which part of the human brain is responsible for precision of voluntary actions and maintaining posture and balance?

A Cerebrum
B Cerebellum
C Medulla
D Hypothalamus

5 What is phototropism in plants?

A Growth in response to gravity
B Growth in response to touch
C Growth in response to light
D Growth in response to water

6 Adrenaline is secreted from which glands?

A Thyroid glands
B Pituitary glands
C Adrenal glands
D Pancreas

7 What is the function of insulin?

A Regulates carbohydrate metabolism
B Regulates protein metabolism
C Regulates blood sugar levels
D Stimulates growth

8 Which hormone is responsible for the development of male sex characteristics?

A Oestrogen
B Progesterone
C Testosterone
D Thyroxin

9 What is geotropism?

A Growth towards light
B Growth away from gravity
C Growth towards water
D Growth in response to gravity

10 What is the role of the spinal cord in reflex actions?

A It is the primary thinking part of the brain
B It processes complex thoughts and decisions
C It acts as a relay center for reflex arcs
D It secretes hormones

11 Which hormone helps in the growth of the stem and is produced by fruits and seeds?

A Abscisic Acid
B Cytokinins
C Gibberellins
D Auxins

12 What happens if there is a deficiency of growth hormone in children?

A Gigantism
B Dwarfism
C Goitre
D Diabetes

13 Iodine is essential for the synthesis of which hormone by the thyroid gland?

A Adrenaline
B Insulin
C Thyroxin
D Growth Hormone

14 What is the function of cytokinins in plants?

A Inhibiting growth
B Promoting cell division and growth
C Promoting cell elongation
D Causing wilting of leaves

15 The movement of the sensitive plant (Chhui-Mui) in response to touch is an example of:

A Movement due to growth
B Nastic movement (independent of growth)
C Tropism
D Hydrotropism

16 What is the primary role of the fore-brain in humans?

A Controlling involuntary actions like breathing
B Maintaining balance and posture
C Receiving sensory impulses and thinking
D Regulating blood sugar

17 How do plant cells change shape to cause movement?

A By changing their protein arrangement
B By changing the amount of water in them
C By secreting chemicals
D By electrical impulses

18 Which hormone inhibits growth and causes wilting of leaves?

A Gibberellins
B Auxins
C Cytokinins
D Abscisic Acid

19 What is the function of the cerebellum?

A Regulating breathing and heart rate
B Coordinating voluntary movements and balance
C Processing sensory information
D Controlling hunger and thirst

20 The growth of a pollen tube towards the ovule is an example of:

A Phototropism
B Geotropism
C Hydrotropism
D Chemotropism

21 Which glands are stimulated by the hypothalamus to release hormones?

A Thyroid and Adrenal glands
B Pituitary gland
C Pancreas and Ovaries
D Pineal and Thymus glands

22 What is the function of thyroxin hormone?

A Regulates blood sugar
B Stimulates growth
C Regulates metabolism
D Controls stress response

23 What is the term for the mechanism that regulates the secretion of hormones based on their levels in the body?

A Stimulation
B Feedback mechanism
C Receptor
D Impulse

24 In males, puberty changes are due to the secretion of which hormone?

A Oestrogen
B Progesterone
C Testosterone
D Growth Hormone

25 Which part of the hind-brain controls involuntary actions like salivation and vomiting?

A Cerebellum
B Pons
C Medulla
D Hypothalamus

26 What is the main function of the nervous system in animals?

A Producing hormones
B Providing structural support
C Transmitting information via electrical impulses
D Regulating metabolism

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