Free Regeneration and Ageing MCQs with Answers

1. Deciduous plants lose their leaves each year in response to changes in the day length.The biorhythm exemplified in the given statement is

• A. Circadian rhythm
• B. Circannual rhythm
• C. Circatidal rhythm
• D. Circalunar rhythm

Explanation: The correct answer is Option B: circannual rhythm. This is because deciduous plants lose their leaves once a year, which aligns with the annual cycle characteristic of circannual rhythms.Option A, circadian rhythm, is incorrect because it involves daily cycles. Option C, circatidal rhythm, is incorrect because it involves tidal patterns, typically occurring multiple times a day. Option D, circalunar rhythm, is incorrect because it involves monthly cycles related to the lunar phases, not annual changes.

2. Which of the following is not related to apoptosis?

• A. Loss of tail of developing humans embryos
• B. Loss of tissues between developing digits
• C. Controlling the number of neurons
• D. None of the these

Explanation: All of the options listed are related to apoptosis, which is a programmed cell death process essential for the development, tissue remodeling, and maintenance of cellular homeostasis. Programmed cell death helps in the proper control of multicellular development, which may lead to the deletion of the entire structure (e.g., the tail of developing human embryos) or part of the structure (e.g., tissue between developing digits). Cell death even controls the number of neurons, because most of the neurons in the human body die during development.

3. Internal program of events and sequences of morphological changes by which cell commit a suicide is collectively called:

• A. Necrosis
• B. Metastasis
• C. Epistasis
• D. Apoptosis

Explanation: Explanation:The internal program of events and sequences of morphological changes by which a cell commits suicide is collectively called apoptosis. Apoptosis is also known as programmed cell death.This option is incorrect. Necrosis is the death of body tissue due to a very low blood supply and can be caused due to injury, etc.This option is also incorrect. Metastasis refers to the spread of cancer cells from the primary tumor site to other parts of the body.Epistasis is a genetic phenomenon where the expression of one gene is influenced by another gene. It occurs when the alleles of one gene modify or mask the effects of another gene.

4. Cell death due to tissue damage is called:

• A. Necrosis
• B. Metastasis
• C. Apoptosis
• D. Epistasis

Explanation: [A] Necrosis is the death of a body tissue,occurring when too little blood flows to the tissue.[B]Metastasis means that cancer has spread to different parts of body[C] Apoptosis the process of programmed cell death[D] Epistasis is a circumstance where the expression of one gene is modified by expression of one or more gene

5. Healing of a wound and repair is the phenomenon which takes place by the process of:

• A. Mitosis
• B. Meiosis
• C. Cell Growth
• D. Mitosis & Meiosis

Explanation: Mitosis is important for three main reasons: development and growth, cell replacement, and asexual reproduction.Mitosis heals wounds by producing new, identical cells through cell division to replace damaged or lost cells, a process called epithelization in the skin. After an injury, the body triggers mitosis, causing cells in the epidermis (outer skin layer) to divide and multiply, migrating to cover the injured area. This increases the cell count, fills in the gaps left by destroyed cells, and reconstructs the damaged tissue, leading to complete or partial repair of the wound.