Which of the following is a plant hormone?

1

(a)

Insulin

(b)

Thyroxin

(c)

Oestrogen

(d)

Cytokinin

The brain is responsible for

1

(a)

Thinking

(b)

balancing the body

(c)

regulating

(d)

All of the above

In a neuron, conversion of electrical signal to a chemical signal occurs at/in

1

(a)

Cell body

(b)

Axonal end

(c)

Dendritic end

(d)

Axon

Which of the following statements are true about the brain?
(i) The main thinking part of brain is hind brain
(ii) Centres of hearing, smell, memory, sight, etc. are located in forebrain.
(iii) Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain
(iv) Cerebellum does not control posture and balance of the body

1

(a)

(i) and (ii)

(b)

(i), (ii) and (iii)

(c)

(ii) and (iii)

(d)

(iii) and (iv)

The movement of shoot towards light is

1

(a)

Geotropism

(b)

Hydrotropism

(c)

Chemotropism

(d)

Phototropism

The shape of guard cells change due to change in the

1

(a)

Protein composition of cells

(b)

Temperature of cells

(c)

Amount of water in cells

(d)

Position of nucleus in the cells

The substance that triggers the fall of mature leaves and fruits from plants is due to

1

(a)

Auxin

(b)

Gibberellin

(c)

Abscissic acid

(d)

Cytokinin

Which statement is not true about thyroxin?

1

(a)

Iron is essential for the synthesis of thyroxin

(b)

It regulates carbohydrates, protein and fat metabolism in the body

(c)

Thyroid gland require iodine to synthesise thyroxin

(d)

Thyroxin is also called thyroid hormone

Dwarfism result due to

1

(a)

Excess secretion of thyroxin

(b)

Less secretion of growth hormone

(c)

Less secretion of adrenaline

(d)

Excess secretion of growth hormone

Junction between two neurons is called

1

(a)

Cell junction

(b)

Neuro muscular junction

(c)

Neural joint

(d)

Synapse

Name the components of neuron.

1

(a)

Dendrite, cell body, axon and nerve ending.

Name the stress and fear hormones.

1

(a)

Adrenaline hormone.

Name one endocrine gland which performs dual function.

1

(a)

Pancreas. It secretes hormones and digestive enzymes.

Name the part of hind brain which takes part in regulation of respiration.

1

(a)

Pons.

Name the hormone secreted by thyroid gland.

1

(a)

Thyroxine.

What is the role of the brain in reflex action?

2

(a)

How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?

2

(a)

How do auxins promote the growth of a tendril around a support?

2

(a)

How does our body respond when adrenaline is secreted into the blood?

2

(a)

What health disorder may occur if the following hormones are not secreted properly?
(a) Growth hormone
(b) Insulin
(c) Thyroxine
(d) Testosterone

3

(a)

Name the hormones released by the following:
(a) Pancreas
(b) Pituitary
(c) Testis
(d) Ovary

3

(a)

Give the difference between sensory and motor nerve.

3

(a)

Draw a diagram of human brain and label on it the following of its parts:
(i) Cerebrum
(ii) Meninges
(iii) Medulla Oblongata
(iv) Cerebellum

3

(a)

How do neurons transmit information?

3

(a)

Name various plant hormones. Also give their physiological effects on plant growth and development.

5

(a)

What are reflex actions? Give two examples. Explain a reflex arc.

5

(a)