Ch11:Cell division
What is chromatin?
Uncondensed chromosome before cell division
Name one example of asexual reproduction
Vegetative propagation OR binary fission
State one function of amniotic fluid.
What is growth?
The irreversible increase in dry mass.
How to distinguish whether a cell is haploid or diploid?
Depend on whether a pair of homologous chromosomes are present
What is the advantage of cross pollination?
Enable genetic variation so offspring can adapt to the environment better.
What is diffused from mother towards the baby through the placenta?
oxygen, nutrients
In which region we can find phloem?
Region of cell division/ Region of elongation/ Region of cell differentiation.
Region of differentiation.
Look at the graph.
Put the 4 stages in ascending order.
Q, P, S, R
What is the fate of ovary, ovule and style?
ovary --> fruit
ovule --> seed
style --> scar
What is the biological principle of rhythm method? How does it work?
Prevent sperm and egg from meeting.
The sudden increase in temperature indicates ovulation.
How does the dry mass of cotyledon change during seed germination? Why?
Decrease as it is broken down as food for plant.
Contrast mitosis and meiosis in term of process.
Mitosis involve 1 nuclear division while meiosis involves 2 nuclear division
OR
Mitosis has no pairing of homologous chromosomes while in meiosis, homologous chromosomes pair up and separate
Look at the photo.
Is it insect pollinated or wind pollinated? Why?
Sigma & anther hang outside the flower
Refer to the graph.
What is the ovulation day?
14/6
How does the wet mass of whole seedling change during germination? Why?
Increase. At first, a huge amount of water is absorbed. Then, leaves develop and undergo photosynthesis.