Control and coordination Worksheet-33

Control and coordination Worksheet-33


Subjective questions:

  1. Draw a diagram of human brain and label on it the following of its parts:

(i) Cerebrum  (ii) Meninges  (iii) Medulla oblongata  (iv) Cerebellum.


  1. Differentiate between tropic and nastic movements in plants. Give one example of each.


  1. Describe the central nervous system in human beings under the following heads:

(i) regions included  (ii) three functions of any one region.


  1. Define 'hormones'. Name the hormone secreted by thyroid. Write its function. Why is the use of iodised salt advised to us?


  1. What is phototropism? How does it occur in plants? Describe an activity to demonstrate phototropism.


  1. What is hydrotropism? Describe an experiment to demonstrate hydrotropism.


  1. What are hormones? State one function of each of the following:

(i) Thyroxin   (ii) Insulin


  1. How does control and coordination take place in plants?


  1. Explain different types of movements depicted by plants.


  1. Explain briefly nervous system in human beings.


  1. Name the pituitary hormones. Mention their functions.


  1. Explain the functions of thyroid hormones. Also name disorders due to abnormal secretions of thyroid hormones.


  1. Explain the following:

(a) Male sex hormones and their functions

(b) Female sex hormones and their functions. Write causes of the following hormonal disorders?


  1. (a) Acromegaly (b) Dwarfism (c) Diabetes mellitus (d) Iodine deficiency goiter (e) Exophthalamic goiter (f) Cretinism (g) Myxodema.


  1. What is homeostasis? Explain it with suitable example.


  1. (a)    What is a reflex action? Give two examples. Illustrate the pathway followed by a message from the receptor in a reflex action.

(b)    Name the synthetic and parasympathetic systems of eye.


  1. (a) What are hormones? (b) List four characteristics of hormones, (c) Name the hormone required for the following:

(i) Functioning of mammary glands.

(ii) Regulation of calcium and phosphorus in blood.

(iii) Lowering of blood pressure.

(iv) Development of moustache and beard in human male.


  1. (a) Draw the structure of a neuron and label the following on it: Nucleus, Dendrite, Cell body and Axon.

(b) Name the part of neuron:

(i) Where information is acquired.

(ii) Through which information travels as an electric impulse.


  1. (a) What is :  (i) phototropism and (ii) geotropism? with labelled diagrams describe an activity to show that light and gravity change the direction that plant parts grow in.

(b) Mention the role of each of the following plant hormones: (i) Auxin (ii) Abscisic Acid


  1. Give reasons for the following:

(i) Pituitary is often termed as master endocrine gland.

(ii) Pancreas is categorised as heterocrine gland.

(iii) Adrenals are known as glands of emergency.


  1. (a) Why do the leaves of 'Touch Me Not' plant (Mimosa pudica) droop down when touched? Name and explain the phenomenon involved in such a response.

(b) Why does the flower of Dandelion opens up in the morning and closes in the evening? Explain. Name this phenomenon.


  1. What is reflex action? With the help of flow chart explain mechanism of reflex action when we suddenly touch a hot object.


  1. Give three differences between cerebrum and cerebellum.


  1. Write a short note on the structure of brain with a neat labeled diagram.


  1. Which are the different kinds of neurons? Explain.


  1. Write a short note on central nervous system.


  1. Write a short note on autonomic nervous system.


  1. What is reflex arc? Explain its working giving a suitable example.