Contractile proteins are found in

Give short answers:
$(i)$ What is the function of cambium?
$(ii)$ What is meant by lignin? Where is it present?
$(iii)$ What are the characteristics of cells of epidermis?

Determine the location of the following tissues:
$1$. Unstriated muscle fibres
$2$. Cuboidal epithelium
$3$. Adipose tissue
$4$. Striated muscle fibres

Name the tissue which is present in the veins of leaves.

$A$ lion and a mango tree are both complex living organisms with specialised yet different tissue systems to perform basic life processes. Give two reasons for possessing different tissues to perform similar functions.

Voluntary muscles are found in