Plastids

Question 1

where are plastids found ?

Answer 1

pplants cells and euglenoids etc. they are large and is easily observable under microscope

Question 2

what are leucoplast?

Answer 2

they are colorless and occurs near the nucleus in non - green cells. granum is absent

Question 3

which are the three types of leucoplasts?

Answer 3

amylopast, elaioplast, aleuroplast

Question 4

explain amylopast ?

Answer 4

they are starch starch storing .eg: rice, potato tuber

Question 5

explain elaioplast?

Answer 5

they are fat storing .eg castor

Question 6

explain aleuroplast?

Answer 6

they are protein storing leucoplast. eg aleurone cells of maize

Question 7

what are the the three types of plastids?

Answer 7

leucoplast,chromoplast,chloroplast

Question 8

what color is chromoplast?

Answer 8

yellow or orange or red

Question 9

which protein gives chromoplast its color?

Answer 9

carotenoid protein

Question 10

give some example of chromoplast in the nature.

Answer 10

green tomato and chili turns red on ripening. carrot roots are orange in color.where is majiority of

Question 11

which is the green plastid?

Answer 11

chloroplast

Question 12

which pigments do chloroplast contain ?

Answer 12

photosynthetic pigments like chlorophyll and carotenoid and the help in food synthesis.

Question 13

where is majiority of chloroplast present?

Answer 13

mesophyll cell of green leaves

Question 14

what is the size of chromoplast?

Answer 14

2-4 micrometers in thickness and 5-10 micrometers in length

Question 15

in what shapes are plastids present?

Answer 15

spherical , lens , oval, dicoid or even ribbon shaped

Question 16

which organism has one chromoplast?

Answer 16

chlamydomonas a green algae

Question 17

how many chromoplasts are present in mesophyll cells of green plants?

Answer 17

20 -40 per cells

Question 18

explain the structure of plastid ?

Answer 18

they are double membrane bound , but the inner membrane is relatively less permeable to substances thus containing more proteins.

Question 19

what is stroma?

Answer 19

stroma is the space enclosed in the inner membrane.

Question 20

what is thylakoid ?

Answer 20

flat membranous sacs present in the stroma.

Question 21

what is grana?

Answer 21

thylakoids are arranged in piles called grana

Question 22

how are grana connected?

Answer 22

grana are connected by a flat membranous tubule called stroma lamella.

Question 23

the membrane of thylakoid enclose a space called?

Answer 23

lumen

Question 24

what does the stroma contain?

Answer 24

the stroma contains enzyme required for synthesis of carbohydrate and protein. it has a small DsDNA and some ribosomes(70s) for protein synthesis.

Question 25

what is chloroplast responsible for storing?

Answer 25

starch

Question 26

where does light reaction of photosynthesis occur?

Answer 26

thylakoid

Question 27

where does dark reaction of photosynthesis occur?

Answer 27

in stroma

Question 28

what are the functions of chloroplast?

Answer 28

1) starch storage

2) photosynthesis