Free Growth and Development MCQs with Answers

151. The process of progressive deterioration in the normal structure and function of tissues is called :

• A. Necrosis
• B. Dysgenesis
• C. Disfigurement
• D. Apoptosis
• E. Aging

Explanation: The process of progressive deterioration in the normal structure and function of tissues is called aging.Aging, also known as senescence, is the natural and inevitable process of growing older that occurs in all living organisms, including humans. It involves a series of biological, physiological, and psychological changes that take place over time. Aging is a complex and multifaceted phenomenon with both intrinsic (genetic) and extrinsic (environmental) factors influencing the rate and experience of aging.Biological aging is the gradual deterioration of bodily functions and structures that occurs with the passage of time. It is associated with changes at the cellular and molecular levels, including cellular senescence, DNA damage, and telomere shortening.Several theories have been proposed to explain the mechanisms of aging, including the genetic theory of aging, the free radical theory, the telomere shortening theory, and the mitochondrial theory. These theories provide different perspectives on the aging process.Aging is associated with various physical and cognitive changes. Common signs of aging may include wrinkles, gray hair, reduced muscle mass, decreased bone density, changes in vision and hearing, memory decline, and decreased metabolic rate.

152. The outcome of cleavage is due to :

• A. Fertilization
• B. Gamete Formation
• C. Organogenesis
• D. Cytoplasmic localization
• E. Incubation

Explanation: The outcome of cleavage is due to cytoplasmic localization. Cytoplasmic localization, in the context of cell biology, refers to the specific location or distribution of molecules, organelles, or cellular components within the cytoplasm of a cell. The cytoplasm is the gel-like substance that surrounds the cell's organelles, including the nucleus, and is the site of various cellular processes.Many cellular organelles are located within the cytoplasm. Examples include the endoplasmic reticulum, Golgi apparatus, mitochondria, and ribosomes. Each of these organelles has a specific function and a characteristic location within the cytoplasm.In some cells, there is movement or "streaming" of cytoplasmic contents. This movement can help distribute nutrients, organelles, and other substances within the cell.The precise cytoplasmic localization of molecules and organelles is a fundamental aspect of cell biology. It is essential for the proper functioning of the cell and plays a crucial role in processes such as cell division, intracellular transport, and signal transduction. Researchers often study cytoplasmic localization to gain insights into cell function and to understand how cellular processes are regulated.

153. In bryophytes, growth takes place at:

• A. Apices
• B. Lateral Region
• C. Intercalary Region
• D. Entire Plant Body
• E. All are incorrect

Explanation: In bryophytes, growth takes place at entire plant body. In bryophytes, including mosses, liverworts, and hornworts, growth takes place throughout the entire plant body due to the presence of meristematic tissue. These plants exhibit a unique growth pattern that is distinct from more advanced vascular plants. Bryophytes exhibit apical growth, which means they primarily grow from their apical meristems. Apical meristems are regions of undifferentiated, actively dividing cells found at the tips of stems and branches. These meristems continuously produce new cells, leading to the elongation of the plant body.Unlike vascular plants (tracheophytes) that have specialized vascular tissues (xylem and phloem) for the transport of water and nutrients, bryophytes lack these tissues. Instead, they rely on simple diffusion for nutrient uptake and transport.In bryophytes, the dominant and visible stage of the life cycle is the gametophyte, which is the haploid, gamete-producing phase. Gametophytes are the leafy structures that are commonly recognized as mosses or liverworts. These structures continually grow by apical cell division, leading to increased plant size.

154. Reconstruction of the lost parts of the body is :

• A. Resuscitation
• B. Dysgenesis
• C. Regeneration
• D. Maturation
• E. Formation

Explanation: Reconstruction of the lost parts of the body is regeneration. Regeneration is the process by which living organisms can replace or repair damaged or lost body parts, tissues, or organs. It is a remarkable ability found in various species across the biological spectrum, from simple organisms like planarians and starfish to more complex animals like salamanders and humans. Regeneration plays a crucial role in tissue repair, wound healing, and the recovery from injuries in these organisms.Regeneration involves various cellular processes, including cell proliferation, differentiation, migration, and tissue remodeling. Stem cells often play a crucial role in regeneration by providing a source of undifferentiated cells that can give rise to various specialized cell types.egeneration has applications in the field of regenerative medicine, where scientists explore ways to stimulate or enhance the body's natural regenerative processes for medical treatments. This includes research into stem cell therapies, tissue engineering, and the development of artificial organs.Regeneration is a complex and fascinating biological phenomenon that varies among species and tissues. While some organisms have remarkable regenerative abilities, understanding and harnessing the potential for regeneration in humans remains a significant area of scientific inquiry and medical advancement.

155. The study of abnormalities present during the embryological development is:

• A. Embryology
• B. Teratology
• C. Tetralogy
• D. Entomology
• E. Immunology

Explanation: The study of abnormalities present during embryological development is teratology. Teratology is the study of abnormalities or anomalies in the development of embryos and fetuses, leading to the formation of congenital malformations or birth defects. These anomalies can affect the structure, function, or metabolism of the developing organism, resulting in various physical or physiological abnormalities.

156. The egg of chick is laid at this stage :

• A. Zygote
• B. Cleavage
• C. Morula
• D. Gastrula
• E. Blastula

Explanation: The egg of chick is laid at the stage of blastula.A blastula is an early stage of embryonic development in animals, following the morula stage. It is characterized by the formation of a fluid-filled cavity called the blastocoel. The blastula represents the next stage of development after the morula, and it is a precursor to the formation of more complex structures, such as the gastrula and, eventually, the embryo.The blastula is a critical developmental stage in the early embryonic development of animals. In some species, the blastula will undergo further changes and invaginate to form a structure called the gastrula, which is the next step in embryonic development and leads to the formation of the three primary germ layers: ectoderm, endoderm, and mesoderm. These germ layers give rise to all the tissues and organs of the developing organism. The specific details of blastula formation can vary among different animal species.

157. The blastoderm splits into:

• A. Epiblast and Hypoblast
• B. Epimere and Hypomere
• C. Mesomere and Epimere
• D. Epiblast and Epimere
• E. Hypomere and Mesomere

Explanation: Epiblast and hypoblast are two distinct layers of cells that play essential roles in the early development of the embryo, particularly in the formation of the three primary germ layers, which give rise to various tissues and organs in the developing organism. These terms are often used in the context of embryology.The epiblast is the uppermost layer of cells in the embryonic disc, which forms during the early stages of embryonic development. It is also referred to as the "primitive ectoderm." The hypoblast is a layer of cells located beneath the epiblast in the developing embryo. It is also known as the "primitive endoderm." The hypoblast plays a critical role in the early stages of embryonic development, particularly in establishing the extraembryonic structures, such as the yolk sac, which provides nourishment to the developing embryo.The interaction and differentiation of cells from the epiblast and hypoblast are essential for the formation of the three germ layers and the development of the embryo. As the embryo continues to develop, these primary germ layers give rise to all the different cell types and tissues that make up the body. Understanding the roles of the epiblast and hypoblast is fundamental to the field of embryology and the study of early embryonic development.

158. The disorder in which there is excessive number of fingers or toes are present, is called :

• A. Dextrocardia
• B. Klinefelter's Syndrome
• C. Polydactyly
• D. Tetralogy
• E. Down's Syndrome

Explanation: The disorder in which there is excessive number of fingers or toes are present, is called polydactyly. Polydactyly is a congenital condition characterized by the presence of more than the usual number of fingers or toes on the hands or feet. In other words, individuals with polydactyly are born with extra digits. Polydactyly can manifest in various forms, and the additional digits can be fully formed, partially formed, or rudimentary. The condition can occur unilaterally (affecting only one hand or foot) or bilaterally (affecting both hands or feet). Polydactyly is considered a congenital limb anomaly. In preaxial polydactyly, the extra digit is located on the thumb side (radial or anterior side) of the hand or the big toe side (hallux or medial side) of the foot.The severity and functional impact of polydactyly can vary widely. In some cases, the extra digit may be fully functional and well-formed, while in others, it may be nonfunctional and poorly developed. Treatment may be necessary in cases where the extra digit causes functional or cosmetic issues. Surgical removal of the extra digit is a common approach to address polydactyly, especially in cases where the additional digit is not functional.Polydactyly can occur sporadically or be inherited as an autosomal dominant genetic trait. When it is part of a genetic syndrome or cluster of anomalies, it may be associated with other congenital conditions. Early diagnosis and evaluation by a medical specialist, such as a pediatric orthopedic surgeon, can help determine the best course of action for managing polydactyly based on the specific circumstances of the individual.

159. Inability of the blood to clot is:

• A. Haemophilia
• B. Thalassemia
• C. Anemia
• D. Sickle Cell Anaemia
• E. Polycythemia

Explanation: Inability of the blood to clot is hemophilia. Hemophilia is a rare genetic disorder that affects the body's ability to form blood clots properly. Individuals with hemophilia have a deficiency or dysfunction of specific clotting proteins, which are essential for normal blood clotting. This can result in prolonged bleeding after an injury, surgery, or even spontaneously. Hemophilia is typically an inherited condition, and it primarily affects males, although females can be carriers.Hemophilia is an X-linked recessive disorder. This means that the affected gene is carried on the X chromosome. Males have one X and one Y chromosome, so if they inherit a faulty X chromosome from their mother, they will have hemophilia. Females have two X chromosomes, so they may be carriers if they inherit one faulty X chromosome. Carriers may not have bleeding symptoms but can pass the condition on to their children.Hemophilia is a lifelong condition, but with appropriate medical care and treatment, most individuals with hemophilia can lead active and relatively normal lives. Regular follow-up with a hematologist or a specialized hemophilia treatment center is important to manage the condition effectively and prevent complications. Hemophilia organizations and support groups also provide valuable resources and assistance to those living with this condition.

160. In birds and mammals, regeneration is mostly linlited to the small wounds by the formation of a new tissue, called :

• A. Papules
• B. Pustules
• C. Scar
• D. Scab
• E. Nodule

Explanation: In birds and mammals, regeneration is mostly linlited to the small wounds by the formation of a new tissue, called scar. A scar is a mark left on the skin or other tissue after a wound, injury, surgery, or other trauma has healed. Scars are a natural part of the body's healing process, and they result from the replacement of damaged tissue with collagen, which is a protein that gives skin its structure and strength. Scars can vary in appearance, texture, and size, depending on various factors such as the nature of the injury, the individual's genetics, and the care provided during the healing process.It's important to note that while these treatments can improve the appearance of scars, no treatment can completely eliminate a scar. Scars are permanent, but their visibility and texture can be significantly reduced with the right approach.