Genetics - Some Basic Fundamentals — Biology STD 10 — Question

Mention characteristic features of mitosis.

What differences are there in number, structure, and activity of the male and female gametes in a man?

Refer to the given diagram of male reproductive system.
(i) Label the diagram.
(ii) Name the major ducts.
(iii) Name the accessory glands.

What does the term “double circulation” mean?

Name the six ancestral forms in their correct sequence through which modern man has evolved.

Match the events given in column A with the phase in mitotic cell division in column B

	Column ‘A’		Column ‘B’
1	Chromosomes get arranged in a horizontal plane at the equator.	a	Prophase
2	Daughter chromosomes move to the opposite poles of a spindle.	b	Anaphase
3	Chromosomes become visible as fine long threads.	c	Metaphase
4	Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network.	d	Telophase

Write short note on the following:
Guttation

Draw a diagram of the human eye as seen in a vertical section and label the part which suits the following functions/descriptions :
(i) The layer which prevents reflection of light
(ii) The structure that helps to focus light on retina
(iii) The region of distinct vision
(iv) The part which transmits the impulse to the brain
(v) The outermost transparent layer in front of the eye lens
(vi) The fluid present in the anterior part of the eye in from of the eye lens

A 50-year-old man, Mr. Johnson, is experiencing frequent urination, especially at night, along with fatigue and swelling in his ankles. Upon examination, his doctor suspects a possible issue with his excretory system. Mr. Johnson is concerned about his condition and seeks clarification on how the excretory system fiunctions and its role in maintaining overall health.
(i) What are the organs involved in excretion in human body and the substances excreted by the excretory system?
(ii) How does the excretory system regulate the balance of water and electrolytes in the body?
(iii) Discuss the role of the kidneys in excretion.