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.