CB2 – CELLS & CONTROL (p20-25) Label the motor neurone Growth in Animals QUESTIONS Q1) What is the weight of a baby in the 95th percentile after 20 months? Q2) After 36 months, what percentage of babies weigh less than 32 pounds? Q3) What percentage of babies weigh more than 12 pounds after 4 months? Reflex Arcs relay neurone sensory neurone motor neurone Growth in Plants Zone of elongation This is where the cells increase in length effector receptor stimulus Xylem This is where water is transported up the stem Mitosis 1. Label each stage 2. What is the purpose of mitosis? 3. How many daughter cells are produced? 4. Cytokinesis is the final stage. Draw it here: 5. What does diploid mean? Meristem Here is where lots of new cells are produced by mitosis Zone of differentiation Here is where cells specialise to get a specific job Root Hair These increase the surface area to absorb lots of water Stem Cells QUESTIONS Q1) What does the term ‘differentiate’ mean? Q2) What does the diagram on the left show? Q3) What is an embryo? Q4) How can stem cells be used in medicine? Q5) Why are embryonic stem cells more useful than adult stem cells? Neurones 1. Label each stage 2. What is the purpose of mitosis? 3. How many daughter cells are produced? 4. Cytokinesis is the final stage. Draw it here: 5. What does diploid mean? Label the motor neurone

CB2 – CELLS & CONTROL (p20-25) Label the motor neurone Growth in Animals QUESTIONS Q1) What is the weight of a baby in the 95th percentile after 20 months? Q2) After 36 months, what percentage of babies weigh less than 32 pounds? Q3) What percentage of babies weigh more than 12 pounds after 4 months? Reflex Arcs motor neurone effector receptor 32 pounds relay neurone 50% sensory neurone 95% relay neurone sensory neurone stimulus motor neurone Growth in Plants Zone of elongation This is where the cells increase in length effector receptor 4 stimulus 1 Xylem This is where water is transported up the stem Mitosis 1. Label each stage 2. What is the purpose of mitosis? 3. How many daughter cells are produced? 4. Cytokinesis is the final stage. Draw it here: 5. What does diploid mean? 5 Meristem Here is where lots of new cells are produced by mitosis 3 Zone of differentiation Here is where cells specialise to get a specific job interphase prophase metaphase anaphase 2 Root Hair These increase the surface area to absorb lots of water telophase New cells Stem Cells QUESTIONS Q1) What does the term ‘differentiate’ mean? To become specialised Q2) What does the diagram on the left show? That a newly fertilised egg can become any cell Q3) What is an embryo? A fertilised egg which will develop into a fetus Q4) How can stem cells be used in medicine? Replace certain cells by differentiating into new cells Q5) Why are embryonic stem cells more useful than adult stem cells? Embryonic stem cells can become any type of cell 2 The full number of chromosomes for an organism. It’s 46 in humans Neurones dendrites muscle (effector) axon Label the motor neurone nucleus myelin sheath