Anatomy-sec growth

Question 1

tissues involved in sec growth

Answer 1

vascular cambium and cork cambium

Question 2

meristamatic layer responsible for cutting ofxylem and phloem

Answer 2

vascular cambium

Question 3

in ———–vascular cambium present in poatches as a single layer bet xylm and phloem

Answer 3

in young stems

Question 4

in dicot stems the cells of cambium present between primary xylem and priamry phloem is called

Answer 4

intrafascicular cambium

Question 5

the ———–adjoining intrafascicular cambium become —-and form interfascicular cambium

Answer 5

cells of medulallry rays
becomme meristamatic

Question 6

the ———–is more or less intact due to the action of vascular cambium in or around centre

Answer 6

primary xylem

Question 7

at some places cambium forms a narrow band of —-which passes through sec xylem and phloem in radial directions called ————-

Answer 7

parenchyma
secondary medullary rays

Question 8

activity of cambium is under the control of

Answer 8

many physiological and environmental factors

Question 9

in —cambium is very active

Answer 9

spring season {or summer

Question 10

in active state in spring season cambium forms—–having ———-with wider cavities

Answer 10

large no of xylary elements
vessels with wider cavities

Question 11

autumn wood also called

Answer 11

late wood

Question 12

in which seasons cambium less active

Answer 12

autumn and winter

Question 13

spring wood is———–in colour and –density

Answer 13

light colour and low density

Question 14

in old tress—–part of sec xylem is dark in colour

Answer 14

greater part

Question 15

heartwood also called

Answer 15

duramen

Question 16

heartwood fn

Answer 16

conduction of water

Question 17

sapwood fn

Answer 17

conduction of water and minerals from root to leaf

Question 18

heartwood is —-in colour

Answer 18

dark

Question 19

peripheral reg of secondary xylem lighter in colour is called

Answer 19

sapwood

Question 20

phellogen aka

Answer 20

cork cambium

Question 21

cork cambium is ——-

Answer 21

meristamatic

Question 22

phellogen devolops usuually in which region

Answer 22

cortex region

Question 23

phellogen chara

Answer 23

couple layers thick
made of narrow hin walled and nearly rectangular cells

Question 24

outercells diff into

Answer 24

cork or phellem

Question 25

innercells diff into

Answer 25

phelloderm or sec cortex

Question 26

the cells of sec cortex are ————–

Answer 26

parenchymatous

Question 27

periderm constitute

Answer 27

phellem
phellogen
phelloderm

Question 28

bark includes

Answer 28

tissues exterior to vascular cambium

Question 29

bark includes

Answer 29

sec phloem periderm

Question 30

at certain regions phellogen cutts off closely arranged ————–instead of ———

Answer 30

parenchymatous cells instead of cork cells

Question 31

lenticels occur in

Answer 31

most woody trees

Question 32

in dicot stem vascular cambium is

Answer 32

partial sec and partial primary

Question 33

n dicot root ,vascular cambium is

Answer 33

completely secondary in origin

Question 34

vascular cambium in roots originate from

Answer 34

below the phloem bundles and above the xprotoxylem

Question 35

state true or false
sec growth also occur in roots and stems of gymnosperms

Answer 35

true

Question 36

bark formed early in the season is called

Answer 36

soft or early barck

Question 37

vessels is a characteristic feature of

Answer 37

angiosperms