CBSE Class 10 Biology Control And Coordination Worksheet Set D

Question. Grey matter is
(a) a fluid
(b) cluster of cytons
(c) a hormone
(d) a network of blood vessel
Answer : B

Question. Which of the following is a plant hormone?
(a) Insulin
(b) Thyroxin
(c) Oestrogen
(d) Cytokinin 
Answer : D

Question. Secondary sexual characters are influenced by
(a) thyroxine
(b) adrenaline
(c) testosterone
(d) oestrogen
Answer : C , D

Question. The brain is responsible for:
(a) thinking.
(b) regulating the heart beat.
(c) balancing the body.
(d) all of the above.  
Answer : D

Question. Plant growth is/are promoted by
(a) cytokinin
(b) auxin
(c) gibberellin
(d) abscisic acid
Answer : A , B ,C

Question. The gap between two neurons is called a
(a) dendrite.
(b) synapse. 
(c) axon.
(d) impulse.
Answer : B

Question. The hormone responsible for anger is
(a) adrenaline
(b) growth hormone
(c) oestrogen
(d) insulin
Answer : A

Question : Which part of the brain is concerned with muscular coordination in the body? 
a. Temporal toke
b. Cerebellum
c. Pons
d. Parietal 10 be
Answer : B 
Explanation: It is responsible for precision of voluntary actions and maintaining the posture and balance of the body.

 

Question : Draw the structure of a neuron and explain its function.
Answer :

Neurons is the fundamental unit of nervous system. Neuron consists of main three parts : Axon, Dendrite and Cell body.
(1) Axon: It conducts messages away from the cell body.
(2) Dendrite: It receives information from axon of another cell and conducts the messages towards the cell body.
(3) Cell body: It contains nucleus, mitochondria, and other organelles. It is mainly concerned with the maintenance and growth.

Question : What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Answer :Functions of receptors:
(1) They sense the external stimuli such as heat or pain.
(2) They also trigger an impulse in the sensory neuron which sends message to the spinal cord.
When the receptors are damaged, the external stimuli transferring signals to the brain are not felt. For example, in the case of damaged receptors, if we accidentally touch any hot object, then our hands might get burnt as damaged receptors cannot perceive the external stimuli of heat and pain.

Question :: How does phototropism occur in plants?
Answer : The growth movement in plants in response to light stimulus due to auxin plant hormone is known as phototropism. The shoots show positive phototropism and the roots show negative phototropism. This means that the shoots bend towards the source of light whereas the roots bend away from the light source.

Question : Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Answer :

Question :  Distinguish between receptor and effector organ.

Question :  What is the functional unit of our nervous system? Describe its structure.

Question : Define nerve impulse. Which structure in a neuron helps to conduct a nerve impulse i) towards the cell body? Ii) away from the cell body?

Question :  How does nervous tissue cause action?

Question :  What are the various functions of the brain?

Question : What is reflex action? How it differs from normal functions of the brain?

Question :  Trace the events occurring in a reflex action such as sneezing?

Question :  Do the plants have a nervous system? If no, then how plants perform the function of control and coordination?

Question :  What are the different types of movements in plants? Describe them giving one example each.

Question :  Write about some plant hormones and their function.

Question :  How the plant bends when it is kept in a room with only one open window?

Question :  What are endocrine glands? Show the position of different endocrine glands in our body.

Question :  Write any three characteristics of hormones.

Question :  How does our body respond when adrenalin is secreted in the blood?

Question :  Define Phototropism Geotropism Hydrotropism Chemotropism.?