The branch of biology concerned with the study of tissues is: MCQ with Answer and Explanation

Explanation:
The skeletal system, composed of bones and cartilage, provides structural support for the body, protects vital internal organs (like the brain and heart), and serves as a site for muscle attachment. The muscular system, consisting of skeletal, smooth, and cardiac muscles, contracts to produce movement of the body and internal organs. The endocrine system comprises glands that secrete hormones directly into the bloodstream to regulate various physiological processes. All statements are correct.

Explanation:
Insulin-like Growth Factor 1 (IGF-1), also known as somatomedin C, is a peptide hormone structurally similar to insulin. It is primarily synthesized and secreted by the liver (and to a lesser extent by other tissues) in response to stimulation by Growth Hormone (GH). IGF-1 mediates most of the growth-promoting (anabolic) effects of GH. It stimulates the proliferation and differentiation of chondrocytes (cartilage cells) in the epiphyseal plates of bones, promotes protein synthesis in muscles, and supports the growth of various other tissues.

Explanation:
Genetic drift is the random fluctuation of allele frequencies in a population, particularly significant in small populations, due to chance events. Gene flow (migration) is the transfer of alleles from one population to another through the movement of individuals or gametes. Natural selection is a non-random, deterministic process where individuals with traits better suited to their environment have higher survival and reproductive success. Thus, statements 1 and 2 are correct.