Chemical coordination in plants — Biology STD 10 — Question

match the conditions in column A with the cause in column B.

	A (Condition)		B (Cause)
a	Dwarfism and mental retardation	1	shortage of glucose in blood
b	Diabetes mellitus	2	Over secretion of growth hormone
c	Excess of glucose in blood	3	Insulin shock
d	Gigantism	4	Over secretion of thyroxine
e	Enlargement of breasts in adult males	5	Hypothyroidism
f	Exophthalmic goitre	6	Over secretion of cortical hormones

Draw a well labelled diagram of a 'Neuron' and name the following parts
(i) Node of Ranvier
(ii) Nissl's granules
(iii) Cyton

Give a labeled diagram of thymus gland.

A woman with normal vision marries a man with normal vision. They have a colourblind son. Her husband dies and she marries a colourblind man. Show the type of children that might be expected from this marriage and the proportion of each.

The diagram given below represents the spinal cord of a mammal, seen in a transverse section together with the nerves. Study the diagram and then answer the questions given below:

(i) Label the parts 1—8 indicated by guidelines.
(ii) What do the arrows indicate? What is the pathway indicated termed?
(iii) What type of nerve is shown in the diagram?

The below diagram is of a developing embryo is a mother’s womb:

(i) Write the functions of the placenta, amnion, and umbilical cord.
(ii) How are the waste products of a fetus removed?
(iii) What is the gestation period?

Draw and label the structure of thyroid gland.

Give reason, why a matured mammalian erythrocyte lacks nucleus and mitochondria?

Sketch and label the human male reproductive system.

On a bright sunny day, water weeds growing in an aquarium were actively giving off bubbles of gas. Use this information to answer questions that follow:

1. Name the process occurring in the water weed that has resulted in the evolution of these bubbles.
2. Of what gas do these bubbles consist?
3. Briefly describe the reactions occurring in the leaves of the water weeds leading to the evolution of these bubbles.
4. Give an overall balanced chemical equation to represent the process named in (i) above.