Frank Brothers Solutions for ICSE Class 9 Biology Chapter 18 Structure And Function Of Skin

PAGE NO: 169

Solution 1:
(a) Stratum corneum, transitional region, stratum germinativum
(b) Stratum germinativum
(c) Stratum corneum
(d) Dermis
(e) Sweat gland / sudoriferous gland
(f) Milk glands/ mammary glands
(g) Wax gland
(h) Epidermis
(i) Melanin
The skin is made of multiple layers with different roles that protect our body and help regulate our temperature. These layers including the protective outer stratum corneum and the growing stratum germinativum work together to provide a barrier against the environment.
Teacher's Tip: Remember "C-T-G" for the layers of the epidermis: Corneum, Transitional, and Germinativum.
Exam Tip: Always mention the specific layer of the epidermis when asked about skin structure to show detailed knowledge.

Solution 2:
(a) soles
(b) epidermis and dermis
(c) stratum corneum
(d) keratin
(e) mesoderm
(f) loose connective tissue
(g) sweat gland
Certain parts of our body, like the soles of our feet, have thicker skin for protection against friction. Various tissues and glands work together to keep the skin healthy and provide structural support.
Teacher's Tip: Think of "Keratin" as the "K" shield that makes skin tough and water-resistant.
Exam Tip: Mention the specific tissue type, like "loose connective tissue," when describing the dermis to get full marks.

Solution 3:
(a) True
(b) True
(c) True
(d) True
(e) False
(f) False
True or false questions check your understanding of biological facts regarding how the skin interacts with the environment. It is important to know which statements about skin functions, such as protection and sensation, are accurate.
Teacher's Tip: Read the full sentence carefully as one wrong word like "only" can make a statement false.
Exam Tip: Always read the entire statement before deciding if it is True or False to avoid silly mistakes.

Solution 4:
(i) (a) stratum Malpighi
(ii) (d) palm
(iii) (b) stratum corneum
(iv) (b) dermis
(v) (b) dermis
(vi) (a) sweat gland
(vii) (c) constrict and the sweat glands are inactive
These answers identify specific parts of the skin and how they react to the environment, such as blood vessels constricting in the cold. It shows how the skin acts as an organ to maintain internal balance regardless of external weather.
Teacher's Tip: Associate "Malpighi" with the "Making" of new cells in the skin layers.
Exam Tip: For multiple-choice questions, write both the option letter and the full answer text clearly.