Control and Coordination Science - Control and Coordination

The bending of the shoot of a plant in response to light is called:

One of the following is an incorrect statement about insulin. This is:

The movement of sunflower in accordance with the path of the sun is due to:

The hormone which is associated with male puberty is called:

The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of:

What is the general name of chemical substances which bring about control and coordination in plants?

Name, the disease caused by the deficiency of thyroxine hormone in the body.

Name one hormone secreted by the pituitary gland.

What is cranium? What is its function?

Which part of the brain maintains posture and balance of the body?

Why is the use of iodised salt advisable?

Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?

What is meant by nastic movements in plants? Give one example of nastic movements in plants.

What is meant by receptors and effectors? Give two examples of each.

What is a tendril? Name the two types of tendrils. What does a tendril do in response to the touch of a support ? What is this phenomenon known as?

What is the difference between a reflex action and walking?

How does control and coordination take place in plants? How does it differ from that in animals?

The human brain can be broadly divided into three regions. Name these three regions.

P, Q, R and S are four major types of phytohormones. P is a phytohormone which functions mainly as a growth inhibitor. It promotes the wilting and falling of leaves. Q, R and S are phytohormones which all promote growth of plants in various ways. Q is responsible for the phenomenon of phototropism in plants. R is involved mainly in shoot extensions. The phytohormone S helps in breaking the dormancy of seeds and buds. What are P, Q, R and S? Give one reason each for your choice.

What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.

When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.

1. What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
2. What is (i) neuron S, and (ii) neuron T?
3. Name the tissue U.
4. What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
5. Name the effector in this whole process.

A and B are two pairs of glands that are present in the human endocrine system. The pair A is found only in females, whereas B is present only in males. Glands A make and secrete two hormones C and D, whereas glands B make and secrete only one hormone E. In addition to hormones, Glands A make gametes F, whereas glands B make gametes G.

1. What are the glands A?
2. What are the hormones C and D?
3. What are the glands B? Name the hormone E.
4. What are the gametes F and G?
5. Which event in the life of males and females is associated with the secretion of the hormones C, D and E?

What is meant by ‘positive geotropism’ and ‘negative geotropism’? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.

Name the hormones secreted by the following endocrine glands:

1. Thyroid gland.
2. Parathyroid glands.
3. Pancreas.
4. Adrenal glands.

A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.

1. Name the structure P.
2. Name (i) bony cage Q, and (ii) membranes R.
3. How much is x?
4. Name the organs S.
5. What are the reflexes involving structure P only known as?

Fill in the following blanks:
Plant roots grow downward in response to _________.

Fill in the following blanks:
Plant shoot grows upward in response to __________.

Fill in the following blanks with suitable words:
A neuron which carries an impulse to the brain is called a ________.

Fill in the following blanks with suitable words:
The two examples of effectors are ________and________.

Fill in the following blanks with suitable words:
The neuron which carries a message for action to a muscle or gland is known as a __________.