Meiosis Class

Form 4 girls are learning Meiosis..Its something new because they hv never learn about it before. Meiosis is another type of CELL DIVISION besides Mitosis.

They have learnt Mitosis and the phases ...PMAT ..They have learnt the importance or the significant of Mitosis. I have asked them to draw and label all the phases in Mitosis in Bio Diagram Book.

Reminding and emphasising the importance of this chapter!!
And I make them draw all the phases in MEIOSIS too...
I make them really focus on the behaviour of the chromosomes in EACH PHASES..

I believe that by drawing and labelling (at least for a few times), will make them remember more of all the phases.
They draw all the phases by completing the module..
and later they are going to draw again in their Bio Diagram Book..
My girls have no complain about it...because they know that they have to learn it in a hard way in order to score A+ for BIO..
Practice makes perfect....and I'm very sure that this chapter will be asked in SPM examination

( paper1 and Paper 2)...So make sure ALL OF YOU out there, please master this chapter and you wont regret :)

Your Task :

DRAW AND LABEL ALL THE PHASES IN MEIOSIS.

For each phases, write at least 2-3 sentences to show the chromosomes behaviours !

Double Fertilisation

WHAT YOU SHOULD KNOW:

1. Draw and label diagrams to show the stages in the formation of:

a) pollen grains from pollen mother cell, [ 4 marks ]

b) embryo sac from embryo sac mother [ 4 marks ]

2. (a) Describe the formation of pollen and grain. [ 4 marks ]

(b) describe the formation of zygote. [ 2 marks ]

(c)describe the formation of triploid nucleus [ 4 marks ]

3.Discuss and draw a concept map of double fertilization in flowering plants. [ 10 marks]

4. Relate the structure of a fruit to the flower parts ~ Paper 1

5.Explain the importance of double fertilization for the survival of flowering plants. [ 4 marks ]

HAPPY REVISING..Kindly drop questions @formspring if you have any :)

FAQ- Reproduction and Growth Part 2

What you should know about placenta?

*Please answer the following questions and mail it to me at mahadiah@gmail.com for checking :)

1. STATE the functions of the placenta in feotal development, [ 2 marks ]

2. EXPLAIN the advantages of foetus having a separate circulatory system from that of the mother. [ 4 MARKS ]

The contribution of science and technology to human reproduction

Know and memorise a few sentences for the following topics, according to marks allocated .

a) family planning [ 5 marks ]

b) sperm bank, [ 2 marks]

c) artificial insemination, [ 3 marks ]

d) in vitro fertilization, [ 6 marks ]

e) surrogate mother [ 2 marks ]

f) sexually transmitted diseases with examples [ 4 marks ]

and finally ....Can you :

● Explain the contribution of science and technology to human reproduction, [ 10 marks]

● explain some moral issues related to the application of science and technology to human reproduction, [ 6 marks ]

FAQ- Reproduction in Human Part 1

They are learning Reproduction this week..Its so tiring to explain without the aid of teaching courseware..just because I want to make it fast ...to complete the syllabus before their Trial Examination which is just around the corner ! No module, no teaching courseware...strictly TALK or... a nicer word LECTURE !

The chapter is important for SPM examination. I'm focusing and emphasising on the following content:

1. Spermatogenesis - The diagram of the cross section of seminiferous tubule

2. Spermatogenesis- The flow chart showing the process starting with germa primordial cell...and end up with spermatozoa.

3. Oogenesis - The diagram of the cross section of ovary. Watch out for the Follicles, primary follicle, Graafian follicle, Corpus luteum.

4.Oogenesis - The flow chart showing the process which ends up with ovum being released while the other 3 degenerate.

5. The menstrual cycle which involves 4 hormones . The interaction between the four...With FSH is the first to rise , followed by oestrogen, next the LH and finally progesterone...YES..it is a negative feedback mechanism where one hormone controls the other hormone..

6. THE GRAPH of the menstrual cycle..Most of Bio reference books produced a good graph to memorise...but...dont get too complicated. Just choose at least 3-4 sentences to memorise for each hormones reaction to answer essay questions..would be fine .

You may be asked to draw graph OR to explain event !

Sample Qs

Pls click image to enlarge the sample answer by a student .

Teachers Day :)

I'm glad to be able to INSPIRE :)

TQ Andi Nor Aisyah :)

XPress Biology- 2011 edition

Republished ~ comprehensive notes ! Quick reference !

Ways of caring for the musculoskeletal system

Discuss ways of caring for the musculoskeletal system:

1. Following a balanced diet:

• taking adequate amount of calcium and phosphorus.
• eating food rich in calcium, for example milk and yoghurt.

2. Having a good posture:

• posture is the position of the body and the way a person holds his body.
• bad posture will puts undue pressure on the muscle and backbone
• sit back on the chair with the hips well up against the back of the chair.
• while standing, head, backbone, hips and legs should be aligned so that a person is balanced with his feet planted firmly on the ground.
• bend the knees and keep the load close to the centre of the body while lifting objects

3. Using a proper attire for daily activities.

• Discuss about the correct shoes
• discuss about the correct clothing

4. Taking appropriate precautions during vigorous activities:

• do stretching exercises before and after workout to avoid cramps and injuries.
• warm up

5. Practising correct and safe exercise techniques:

• its important to avoid injuries.

How fish moves-Question and Answer

LOCOMOTION IN A FISH ( 10 marks max)-

Ø The muscles consist of muscle blocks i.e., MYOTOMES arranged in segments on both sides of the vertebral column.

Ø The muscles act antagonistically.

Ø Contraction of myotomes on one side of the vertebral column and relaxation on the other side

Ø Causes the body to bend in a direction of the contraction

Ø Alternate contractions of the right and left myotome blocks causes body to bend side to side and the tail to bend accordingly.

Ø This produce a forward thrust which propels the fish forward

Ø Presence of fins i.e. dorsal and ventral fins, paired pectoral and pelvic fins.--- for stability

Ø The streamlined shapes –--to overcome water resistance and enable to move quickly in the water.

Ø The skin is covered with scales that have slimy coat---help reduce water resistance

Transpiration

It is very important to know the movement of water from soil upwards. You should be able to describe right from the beginning...and it starts with water molecules in the soil. Dont forget the keywords such as: hypotonic, root pressure, cohesion, adhesion, capillary action, transpirational pull...and arrange the explanation of the process in sequence...

How earthworm moves

Describe how earthworm moves : [ 5 marks]

v an invertebrate which has a hydrostatic skeleton.

v Body wall has longitudinal and circular muscles

v These muscles act antagonistically to cause movement

v Contractions of circular muscles cause the segments to extend while longitudinal muscles relax //

v Conversely the contractions of the longitudinal muscles cause segments to shorten.

v Locomotion takes place when the chaetae secure shortened segments in the posterior to the ground while //

v The anterior segments extend owing to contractions of the circular muscles.

v Fluid in the body cavity helps the earthworm to move.

**Note:

1.Any of the five points above for the maximum marks.

2.Written in bold are the Key sentences.

The Auxin Song

Auxin is a plant hormone. You have to know its behaviours in order to answer question correctly...

Phototropism and Auxin

Phototropism and Geotropism

Cell Division, Meiosis

meiosis with crossing over

how cell cycle works

Cell Cycle is an important event in Cells..and you must take note all tha major events in the cycle. It includes INTERPHASE: G1 phase, S phase, G2 phase and M PHASE : Mitosis and cytokinesis.

Meiosis