CBSE Class 10 Biology Control and Coordination Worksheet Set 02

Question. Which of the following endocrine glands does not exist in pairs?
(a) Testes
(b) Adrenal
(c) Pituitary
(d) Ovary

Answer : C

Question. Breathing is controlled by which part of the brain?
(a) Cerebrum
(b) Cerebellum
(c) Hypothalamus
(d) Medulla oblongata

Answer : D

Question. Roots of plants are:
(a) positively geotropic
(b) negatively geotropic
(c) positively phototropic
(d) None of these

Answer : A

Question. Which of the following tissues provide control and coordination in animals?
(a) Nervous and Skeletal
(b) Muscular and Skeletal
(c) Muscular and Transport
(d) Nervous and Muscular

Answer : D

Question. Reflex actions are mediated through
(a) brain
(b) effectors
(c) spinal cord
(d) receptors

Answer : C

Question. The leaves of Mimosa are sensitive to
(a) light
(b) smell
(c) touch
(d) heat

Answer : C

Question. Identify which of the following statements about thyroxin is incorrect?
(a) Thyroid gland requires iodine to synthesize thyroxin.
(b) Thyroxin is also called thyroid hormone.
(c) It regulates protein, carbohydrates and fat metabolism in the body.
(d) Iron is essential for the synthesis of thyroxin.

Answer : D

Question. Which statement is incorrect about auxins?
(a) They promote the growth of root
(b) They promote the growth of shoot
(c) They influence the formation of flower and ripening of fruit
(d) They inhibit the growth of root

Answer : A

Question. Response of plant roots towards water is called:
(a) Chemotropism
(b) Phototropism
(c) Hydrotropism
(d) Geotropism

Answer : C

Question. Which part of a nerve cell contains a nucleus?
(a) Axon
(b) Dendrite
(c) Cyton
(d) Nerve endings

Answer : C

Very Short Answer

Question. Which gland is known as glands of emergency? 
Answer: Adrenal glands are often known as glands of emergency.

Question. What is the highest coordinating center in the body? 
Answer: Brain is the highest coordinating center in the body.

Question. What is insulin? 
Answer: Insulin solution being filled in a syringe through the injection mode.

Question. What is the use of voluntary nervous system? 
Answer: The voluntary nervous system helps us to take voluntary actions which are under the conscious control of the brain.

Question. What are meninges?
Answer: The brain is surrounded by three membranes called meninges.

Question. Name one plant hormone that promotes growth and another plant hormone which inhibits growth.
Answer : Promotes growth : Gibberellin ; Inhibits growth : Abscisic acid

Question. Name one example of the movement of a plant part which is very quick and can be observed easily.
Answer : Folding up of the leaves of a sensitive plant on touching

Question. Which of the following is a growth movement and which is not ?
(a) folding up of leaves of sensitive plant on touching with hand.
(b) folding up of petals of dandelion flower when light fades.
Answer : (a) Not a growth movement
(b) It is a growth movement

Question. Name the plant part :
(a) which bends in the direction of gravity but away from light
(b) which bends towards light but away from the force of gravity
Answer : (a) Root (b) Stem (or Shoot)

Question. To which directional stimuli do :
(a) roots respond ?
(b) shoots respond ?
Answer : (a) Light, Gravity and Water (b) Light and Gravity

Question. Name the type of chemical substances that control the growth in plants.
Answer : Plant hormones

Question. What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) thigmotropism ?
Answer : (a) phototropism- light
(b) geotropism - gravity
(c) chemotropism - chemicals
(d) Hydrotropism - water
(e) thigmotropism- touch or physical contact

Question. Give the scientific terms used to represent the following :
(a) Bending of a shoot towards light.
(b) Growing of roots towards the earth.
(c) Growth of a pollen tube towards ovule.
(d) Bending of roots towards water.
(e) Winding of tendril around a support.
Answer : (a) Bending of shoot towards light - phototropism
(b) Growing of roots towards earth - geotropism.
(This means that plant respond positively for gravitational force.)
(c) Growing of pollen tube towards ovule - chemotropism (chemo = chemicals)
(d) :- Bending of roots towards the water - hydrotropism (hydro =water)
(e) The winding of tendril around a support - thigmotropism.

Question. What is the general name of chemical substances which bring about control and coordination in plants ?
Answer : Phytohormones (or Plant hormones)

Question. Which plant hormone is responsible for the wilting and falling of leaves ?
Answer : Abscisic acid

Question. Which plant hormone makes a stem (or shoot) bend towards light ?
Answer : Auxin

Question. Where is the auxin hormone made in a plant stem ?
Answer : In the tip of plant stem

Question. What is the scientific name of sensitive plant ?
Answer : Mimosa pudica

Question. Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).
Answer : Folding up of the leaves of a sensitive plant on touching

Question. (a) which is positively hydrotropic as well as positively geotropic.
(b) which is positively phototropic but negatively geotropic.
Answer : (a) Root (b) Stem (or Shoot)

 

16. Fill in the following blanks :

(a) A plant’s response to light is called ................
Answer : (a) phototropism

(b) A plant’s response to gravity is called ................
Answer : geotropism

(c) Plant shoot grows upward in response to ................
Answer : sunlight

(d) Plant roots grow downward in response to ................
Answer : gravity

(e) Tendrils wind around a support in response to ...............
Answer : touch

(f) Plant roots grow towards……. and in the direction of force of ...............
Answer : water ; gravity

(g) A root of a plant grows downward. This is known as ...............
Answer : positive geotropism

(h) …… is the hormone that causes phototropism in plants
Answer : Auxin

(i) The response of leaves to the sunlight is called ...............
Answer : phototropism

 

Short Answer type Questions

Question. (a) Draw the structure of neuron and label its part.
(b) Name the part of neuron:
(i) where information is acquired
(ii) through which information travels as an electrical impulse.
Answer : a) Refer diagram given in the study material. (FIG.1)
b) i. Dendrites
ii. cell body and axon

Question. What is chemotropism? Give one example. Name any two plant hormones and mention their functions.
Answer : Chemotropism is the movement of a part of the plant in response to a chemical stimulus.
It can be positive chemotropism or negative chemotropism. Example: The growth of pollen tube towards a chemical which is produced by an ovule during the process of fertilisation in a flower.
Two plant hormones with their functions are as follows:
Auxins promote growth, cell elongation, cell differentiation, root formation.
Gibberellins stimulate stem elongation, seed germination.

Question. Write one example each of the following tropic movements :
(i) Positive phototropism (ii) Negative phototropism
(iii) Positive geotropism (iv) Negative geotropism
(v) Hydrotropism (vi) Chemotropism
Answer : (i) Positive phototropism: shoots growing towards light.
(ii) Negative phototropism: roots growing away from light towards ground.
(iii) Positive geotropism: growth of roots towards earth due to the pull of the earth.
(iv) Negative geotropism: shoots growing away from the earth.
(v) Hydrotropism: roots growing towards the source of water.
(vi) Chemotropism: growth of pollen tubes towards the ovules.

Question. What is ‘hydrotropism’? Describe an experiment to demonstrate ‘hydrotropism’.
Answer : ‘Hydrotropism’ is the directional growth of a plant part in response to water. For example, roots show hydrotropism as they grow towards water in the soil and are positively hydrotropic.
An experiment to demonstrate hydrotropism is as follows:

• A porous pot filled with water is taken and inserted in a tub filled with dry sand.
• A freshly germinated pea seedling is sown in the sand.
• As water is not available in sand, the root growing will bend towards the porous pot filled with water.
• A hydrotropic curvature of the root is observed as it grows towards water.
• This bending of root shows the movement in response towards water 

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