Plants 9.3 Growth in plants Flashcards Preview

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Flashcards in Plants 9.3 Growth in plants Deck (57)
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1

What is determinate growth?

animals and some plant organs are either a defined juvenile or embryonic period or growth stops when a certain size is reached or a structure is fully formed

2

How can growth be indeterminate?

when cells continue to divide indefinitely

3

Do most plants have determinate or indeterminate growth?

indeterminate

4

What phenomenon sets plant cells apart from most animal cells?

plants cells (including fully differentiated types) have capacity to generate whole plant called TOTIPOTENT

5

What does it mean when cells are totipotent

plants cells (including fully differentiated types) have capacity to generate whole plant

6

What are meristems?

regions where growth in plants occurs as it is composed of undifferentiated cells undergoing active cell division

7

What are apical meristems?

primary meristems found at tips of stems and roots

8

Where are shoot apical meristems found?

top of the stem

9

What kinda of meristems do many dicotyledonous plants also develop?

Lateral meristems

10

What do undifferentiated cells in the meristem allow?

indeterminate growth

11

How do cells in meristems produce more cells?

by dividing by mitosis and cytokineses

12

What is the root apical meristem responsible for?

growth of the root

13

What do shoot apical meristems produce?

throws off the cells that are needed for growth and produces cells that grow leaves and flowers

14

What type of meristems can be found in plants?

apical and lateral

15

How does the differentiation of meristem cells cause the growth of the plant?

For each division, one cell remains in the meristem while the other one grows in size and is pushed away from th region

16

What kinda of meristems can apical meristems produce?

protoderm, procambium and ground meristem

17

what tissue does protoderm produce?

epidermis

18

What tissue does procambium produce?

vascular tissues

19

What tissus does ground meristem produce?

pith

20

What is leaf primordia?

Small bumps at the side of shoot apical meristem that will develop into leaves

21

What is this called?

leaf primordia

22

What controls the growth in shoot appex?

Plant hormones

23

What is hormone?

chemical message produced and released in one part of an organism to affect another part

24

What are auxins?

hormones that can initiate growth of roots, influence development of fruits and regulating leaf development

25

What is the most abundant auxin?

IAA

26

What role does IAA have?

controls growth in shoot apex; promotes elongation of cells in stems

27

Where is IAA synthesized

in the apical meristem of the shoot and transported down the stem to stimulate growth

28

What can high concentrations if IAA cause?

it can inhibit growth at nodes

29

What are axillary buds?

shoots that form the junction/node of the stem and base of a leaf

30

What is apical dominance?

As shoot apical meristem grows and forms leaves, regions of meristem are left behind at the nodes. Growth at nodes is inhibited by auxin