Q4 grades, clearance, and a message


Let me know if you have any questions. This will be considered final on Wednesday, Mar. 18th. 😀


I will be signing clearances this whole month. If you are unable to have your clearances signed, the next session will be in June.

STR Clearance
Please return your lab manual and glassware to Sir Jun, the STR lab technician. I won’t sign unless he signs.

Bio Clearance

  1. There will be a clean-up activity for SHB 111 and the SHB AVR on March 20 (9-10 for Cs, 1-2 for Rb). Please attend during the time slots allotted for your section. Bring cleaning materials (rags, detergent, sandpaper, acetone) and a change of clothes. If you can’t make it for whatever reason, please let me know ASAP.
  2. Submit your EOQReflections: Cs CN – 5, 14, 17, 19 and Rb CN – 7 and 10. You may send via email or comment here.
  3. Please have the Bio lab technician, Ma’am Lhen sign your clearances before we do.


Thanks for a great year, kids! Congrats for surviving Bio2 and STR1. Enjoy the summer! 😀


Last call for field bio applicants

Interested field bio applicants,

Please sign up for your interview if you haven’t already done so. Last day for signing up for the interview is TUESDAY, March 10. Else, you cannot apply for the elective anymore.

The sign up sheet is at the biology unit bulletin board.

FB1 (Application Form) is due on the date of your interview. The other requirements can be submitted after your interview, but NOT LATER THAN WEDNESDAY, March 11.

If you have any questions about the elective, feel free to inquire at the biology unit.

Maria Elena K. Dacanay
Biology Unit, Philippine Science High School – Main Campus

Fourth Periodic Test Announcement

Guide questions for review

Nervous System

  1. What are the main functions of the nervous system?
  2. Describe the roles of the two types of cells that make up the nervous system.
  3. Name the parts and describe the functions of a neuron.
  4. Trace the pathway of a simple reflex action such as the knee-jerk reflex.
  5. Describe the events that occur during nerve impulse transmission.
  6. What is saltatory conduction and why is it important?
  7. How do nerve cells communicate with each other?
  8. Describe the nervous system plans and features across taxa and relate this to the animal’s symmetry and lifestyle.
  9. Describe the trends in the development of the vertebrate brain.
  10. List the components of the central nervous system and describe their functions.
  11. List the components of the peripheral nervous system and describe their functions.
  12. Compare the parasympathetic and sympathetic divisions of the autonomic nervous system in terms of function.
  13. Enumerate the parts of the vertebrate brain and describe their functions.

Sensory Mechanisms

  1. Differentiate between sensation and perception.
  2. Describe the five kinds of sensory receptors and give examples of each.
  3. Differentiate interoreceptors from exteroreceptors and give examples of each.

Plant Hormones

  1. What are tropisms? Give examples of these.
  2. Describe the roles of abscisic acid, auxin, cytokinin, ethylene, and gibberellin in regulating plant growth.
  3. Describe how the Darwin and Went experiments led to the discovery of auxin as the major factor behind phototropism.

Endocrine System

  1. What are hormones?
  2. Relate the function of the endocrine system with that of the nervous system.
  3. Differentiate between (+) and (-) feedback. Why are feedback mechanisms important in regulating hormone production?
  4. Why can hormones only affect specific cells and not others?
  5. Describe the role of hormones in invertebrates.
  6. Differentiate between the mode of action of a peptide/protein hormone vs that of a steroid/thyroid hormone.
  7. Why are signal transduction pathways important?
  8. Describe the role of the hypothalamus in the endocrine system.
  9. Describe the sources and functions of the hormones found in p.899 of your \m/ bio book.
  10. Describe the role of negative feedback in the regulation of thyroid hormones and maintenance of blood glucose levels.
  11. Describe the roles of the hormones (GnRH, LH, FSH, estrogen, progesterone) secreted by the hypothalamus, anterior pituitary gland, and ovary in regulating the female reproductive cycle.

Reproductive System

  1. Compare asexual and sexual reproduction and discuss advantages and disadvantages of each.
  2. Describe the different mechanisms of asexual reproduction (e.g. fission, budding, gemmules, fragmentation).
  3. Relate the choice of reproductive strategy with the availability of mates and resources, environment, and the lifestyle of the organism.
  4. Compare internal and external fertilization and discuss advantages and disadvantages of each.
  5. Enumerate the parts and describe the functions of the male and female reproductive systems.
  6. Compare the structure of the sperm cell with that of the egg cell.
  7. Describe the events that occur during fertilization.

All presentations are available at the Bio Downloads tab. I will also be holding an optional consultation period this Friday afternoon at the Bio AVR at 230 for Cs and 320 for Rb. I’ll also try to be online this weekend for YM consults. I also welcome questions/answers to questions via email. 😀

As usual, those with grades below 1.75 are required to submit their NB’s. Everyone is required to submit EOQ Reflections: favorite topic, misconceptions, practical applications of concepts learned, and questions  (just write on a sheet of paper). Deadline is 10:30AM on Monday, 3/9. There will be trays in your classrooms for this purpose.