Assignment for Class 10 Science Chapter 7 Control And Coordination
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 7 Control And Coordination in standard 10. This test paper with questions and answers for Grade 10 Science will be very useful for exams and help you to score good marks
Chapter 7 Control And Coordination Class 10 Science Assignment
Multiple Choice Questions (MCQs)
Question. Which of the following is not a plant hormone ?
(a) auxin
(b) ascorbic acid
(c) cytokinin
(d) abscisic acid
Answer : B
Question. One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :
(a) gibberellin
(b) eltroxin
(c) cytokinin
(d) auxin
Answer : D
Question. The movement of a plant part in response to the force of attraction exerted by the earth is called :
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism
Answer : B
Question. The movement of sunflower in accordance with the path of the sun is due to :
(a) photonasty
(b) phototropism
(c) hydrotropism
(d) chemotropism
Answer : B
Question. The plant part which exhibits negative geotropism is :
(a) root
(b) stem
(c) branch
(d) leaves
Answer : B
Question. A big tree falls in a forest but its roots are still in contact with the soil.
The branches of this fallen tree grow straight up (vertically). This happens in response to
(a) water and light
(b) water and minerals
(c) gravity and water
(d) light and gravity
Answer : D
Question. Which of the following is not caused by a growth movement ?
(a) bending of the shoot of a plant in response to light
(b) closing up of leaves of a sensitive plant on touching with an object
(c) climbing up of a plant on an object by using tendrils
(d) movement of the root of a plant towards a source of water
Answer : B
Question. The root of a plant is :
(i) positively phototropic but negatively geotropic
(ii) positively geotropic but negatively phototropic
(iii) negatively phototropic but positively hydrotropic
(iv) negatively hydrotropic but positively phototropic
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
Answer : B
Question. The main function of the plant hormone called abscisic acid is to :
(a) increase the length of cells
(b) promote cell division
(c) inhibit growth
(d) promote growth of stem and roots
Answer : C
Question. The growth of tendrils in pea plants is due to the :
(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support
Answer : C
Question. Which of the following phytohormone is not associated with the promotion of growth in plants ?
(a) auxin
(b) abscisic acid
(c) gibberellin
(d) cytokinin
Answer : B
Question. The plant hormone which triggers the fall of mature leaves and fruits from the plant body is :
(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin
Answer : C
Question. Which of the following terms denotes the movement of the root of a plant towards moisture in the soil ?
(a) thigmotropism
(b) chemotropism
(c) hydrotropism
(d) geotropism
Answer : C
Question. The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism
Answer : D
Question. The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty
Answer : B
Question. The stimulus in the process of thigmotropism is :
(a) touch
(b) gravity
(c) light
(d) chemical
Answer : A
Question. A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of :
(a) chemotropism
(b) hydrotropism
(c) phototropism
(d) geotropism
Answer : C
Question. Which of the following acts as a stimulus in the process of hydrotropism ?
(a) hydrocarbon
(b) hydrogen oxide
(c) hydrogen chloride
(d) hydrogen peroxide
Answer : B
Question. The growth movement of a plant part in response to the touch of an object is called :
(a) thigmonasty
(b) hydrotropism
(c) thigmotropism
(d) geotropism
Answer : C
Question. The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :
(a) chemotropism
(b) nastic movement
(c) thigmotropism
(d) geotropism
Answer : C
Question. The rate of growth in roots is decreased by one of the following plant hormones. This plant hormone is :
(a) gibberellin
(b) auxin
(c) cytokinin
(d) ethene
Answer : B
Question. When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of :
(a) chemotropism
(b) thigmonasty
(c) photonasty
(d) thigmotropism
Answer : B
Question. Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night.
This response of dandelion flowers to light is called :
(a) phototropism
(b) thigmonasty
(c) chemotropism
(d) photonasty
Answer : D
Question. To which of the following directional stimulus roots of a plant do not respond ?
(a) moisture
(b) candle light
(c) touch
(d) gravity
Answer : C
Question. One of the following is not caused by the growth related movement of the concerned plant part. This is :
(a) phototropism
(b) photonasty
(c) thigmonasty
(d) thigmotropism
Answer : C
Question. The bending of the root of a plant away from a source of light is caused by a plant hormone called :
(a) cytokinin
(b) gibberellin
(c) abscisic acid
(d) auxin
Answer : D
Question. Most of the plant hormones promote plant growth. A plant hormone which inhibits growth is :
(a) abscisic acid
(b) ethene
(c) ascorbic acid
(d) cytokinin
Answer : A
Question. The movement of a shoot towards light is :
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism
Answer : D
Question. The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin
Answer : B
Question. Which of the following plant part exhibits negative phototropism ?
(a) root
(b) branch
(c) leaves
(d) stem
Answer : A
Question. Which of the following are not tropisms ?
(i) growing of pollen tube in response to a sugary substance
(ii) folding up of leaves of sensitive plant in response to touch
(iii) winding of tendril around a support in response to touch
(iv) opening up of the leaves of a daisy flower in response to light
(a) (i) and (ii) (b) (ii) and (iii) (c) (i) and (iv) (d) (ii) and (iv)
Answer : D
Study the diagram of reflex arc and answer the following questions
Question. Reflex action is controlled by
a) CNS
b) PNS
c) ANS
d) None of these
Answer : A
Question. Which is the correct sequence of the components of a reflex arc?
a) Receptors→ muscles→ sensory neuron→ motor neuron→ spinal cord
b) Receptors→ motor neuron→ spinal cord→ sensory neuron→ muscles
c) Receptors→ spinal cord→ sensory neuron→ motor neuron→ muscles
d) Receptors→ sensory neuron→ spinal cord→ motor neuron→ muscles
Answer : D
Question. While studying Rahul slapped his right arm with left hand unknowingly and found a mosquito was dead with tint of blood. The slapping action of Rahul is due to:
a) Involuntary action
b) Voluntary action
c) Reflex action
d) Automatic action
Answer : C
Question. Which of the following is not a function of sensory organ?
a) Detect all changes in the environment
b) Send appropriate signal to CNS
c) Analysis of signal
d) Receives signal
Answer : C
Very Short Answer
Question : Name the hormones secreted by pancreas.
Answer : Pancreas secertes Insulin and Glucagon hormone.
Question. What name is given to chemical substances which bring about control and coordination in plants?
Answer : Plant hormone.
Question. Which part of our brain is responsible for maintaining posture and balance of our body?
Answer : Cerebellum.
Question. Which part of the brain is concerned with memory, will and power?
Answer : Cerebral hemisphere.
Question. What are nastic movements?
Answer : There are certain movements due to stimulus of certain movements due to stimulus of contact, light, heat, etc. Such movements are called nastic movements.
Question. What are the different stimuli acting on plants?
Answer : Light, gravity, water and touch.
Question. State the function of:
(a) gustatory receptors, and
(b) olfactory receptors
Answer : (a) Gustatory receptors receive taste.
(b) Olfactory receptors receive smell.
Question. Name the part of human body in which the adrenal and pituitary glands are located.
Answer : Adrenal – Above kidney and
Pituitary – Brain.
Question. What will happen to a plant shoot if sunlight falls on it from one direction only?
Answer : The shoot will bend towards light.
Question. How do plants convey information?
Answer : By chemical coordination.
Question. Name one organ where growth hormone is synthesized in case of plants and man.
Answer : Shoot tip in plants and pituitary gland (anterior) in man.
Short Answer
Long Answer
1. Which endocrine gland is unpaired?
2. Which part of the brain controlled posture and balance of the body?
3. Where in a neuron, conversions of electrical signal to a chemical signal occur?
4. Which gland secretes digestive enzyme as well as hormones?
5. We suddenly withdraw our hand when a pin pricks. Name the type of response involved in this action.
6. What is a tropic movement? Explain with an example.
7. What will happen if intake of iodine in our diet is low?
8. Draw the structure of neuron and label the following on it:
a. Nucleus
b. Dendrite
c. Cell body
d. Axon
9. Why are some patients of diabetes treated by giving injections of insulin?
10. Why is the flow of signals in a synapse from axonal end of one neuron but not the reverse?
11. What are reflex actions? Explain reflex arc.
12. What are the major parts of the brains? Mention the functions of each.
13. How does chemical co – ordination take place in animals?
14. a. Name the various plant hormones.
b. Give physiological effects of hormones on plant growth and development.
HOTS QUESTIONS (SOLVED / UNSOLVED)
Q1. Which hormone:
1. prepares the body for action?
2. controls the amount of sugar (glucose) in blood?
3. brings about changes in boys at puberty?
4. brings about changes in girls at puberty?
Ans. a) Adrenaline b) Insulin
c) Testosterone d) Oestrogen
Q2. i) Name the hormone produced by thyroid gland.
ii Which mineral is necessary for the synthesis of the above hormone?
iii Name the disease suffer from the deficiency of this mineral.
iv Write the function of the above hormones?
Q3. What is chemotropism? Give one example of chemotropism.
ORAL QUESTIONS
1. What is the basic unit of nervous system?
2. How do neuron conduct message from brain to other parts?
3. What do you mean by CNS?
4. What are its main parts?
5. Which part controls reflex action?
6. What are endocrine glands?
7. What is the secretion of endocrine gland called?
8. Name a gland of human body which secretes both enzymes and hormone.
9. Which plant hormone helps in cell division?
10. Which hormones help on stem elongation?
QUIZ
1. Which system of our body is made of organised network for conducting information in the body?
2. Which part of the neuron receives information?
3. What is the name of the neuron which remains between the sensory neuron and the motor neuron? Where is it located?
4. Which part of the brain helps us to do activities like riding a cycle and walking in a straight line?
5. What are two major types of muscles we have?
6. What causes change in leave of ‗touch me not‘ plant?
7. Which hormone helps us to prepare to combat adverse condition?
8. Name a female sex organ which produces gametes as well as female hormone.
ACROSS
1. Composed of the brain and spinal cord (3 words).
8. Contains photoreceptors; on the inner posterior portion of eye.
9. "Inside the mouth"
11. Electrical brain activity recorded with scalp or brain electrodes (abbreviation).
13. Necessary for hearin
17. Neurotransmitter in brain, spinal cord and peripheral nervous system (abbreviation).
18. Outermost layer of meninges.
19. Neurotransmitter lacking in patients with Parkinson's disease.
21. Supportive cells of the nervous system; "glue".
22. Nerve cell.
23. Photoreceptor that is not used for color vision.
24. Photoreceptor that is used for color vision.
26. The sense of hearing.
29. Opposite of "Yes"
30. Junction between two neurons.
DOWN
1. In the brain, it is the outermost layer of the gray matter.
2. The fifth cranial nerve.
3. The middle layer of the meninges.
4. The part of the cell containing chromosomes.
5. Period of sleep when dreams occur (abbreviation).
6. The second cranial nerve.
7. Fat-like substance that surrounds some axons.
10. The first cranial nerve.
12. Fluid that fills the ventricles (abbreviation).
14. Part of neuron that takes information TO the cell body.
16. Short for "mother".
18. Electrical brain activity between 2 and 4 Hz.
20. Part of neuron that takes information AWAY from the cell body.
22. A short written letter.
24. Abbreviation for 1 across.
25. Organ for vision.
27. Opposite of "off".
28. Opposite of "yes".
Refer to attached file for more questions-CBSE Class 10 Science Control and Coordination Assignment Set A
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