The changes in the biochemical composition and physiology occurring at regular intervals in 24 hours is termed as:
Correct answer: C. circadian rhythm
- A. geoannual rhythm
- B. lunar rhythm
- C. circadian rhythm
- D. tidal rhythm
Explanation
Circadian rhythms are intrinsic 24-hour cycles that affect physiological, mental, and behavioral functions in living organisms. These rhythms align with the Earth's rotation, resulting in predictable changes in response to light and dark cycles. The incorrect options are:Geoannual rhythm: Relates to yearly changes, not daily.Lunar rhythm: This rhythm is based on the moon's phases, approximately 29 days long.Tidal rhythm: These rhythms are dictated by tidal patterns, typically occurring over about 12 hours, not 24 hours.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Plant Growth Regulators
Plant growth regulators are chemical messengers that control growth, development and responses to the environment. The topic covers auxins, gibberellins, cytokinins, abscisic acid and ethylene, including cell elongation, apical dominance, tropisms, seed germination, dormancy, fruit ripening and leaf fall, with growth promoters distinguished from inhibitors.
Practise Forms and Functions of Plants
272 free Forms and Functions of Plants MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Biology questions like this
Biology is on 8 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.