development of ovule🐾🔭⛄

Question 1

nucellus develops from

Answer 1

placenta

Question 2

any 1 hypodermal cell of nucellus diff. and +ces in size, it bcms diff from cells due to +e of disstinct nucleus ; now c/as

Answer 2

ARCHEASPORIAL CELL

Question 3

ARCHEASPORIAL CELL now divides mitotically to form a

Answer 3

1 primary parietal cell

1 sporogenous cell

Question 4

1 primary parietal cell directly acts as

Answer 4

megaspore mother cell [ at micropylar end ] *—— i.e a single mmc is diff. in the micropylar region of nucellus during ovule development

Question 5

mmc is large cell with dense cytoplasm and a prominent nucleus

Answer 5

mmc divides meiotically to form 4 haploid megaspores

Question 6

the process of formn. of megaspores from mmc is c/as

Answer 6

MEGASPOROGENESIS

Question 7

majorly; in flowering plants the megaspore__________remains______________ while other 3 while lying towards ________ degenarate

Answer 7

lower end or chalazal
functional
micropylar

Question 8

functional megaspore produces

Answer 8

female gametopyte [ embryo sac ]

Question 9

in most of angiosperms [ capsella]________ remains fuctional

Answer 9

chalazal

Question 10

mehod of embroyo sac formation from 1 megaspore is

Answer 10

t/m as monosporic development

Question 11

ploidy of cells- nucellus

mmc

functional megaspore

female gametophyte

Answer 11

2n

2n

n

n

Question 12

megagametogenesis= ____ is the 1st cell of the female gametophyte

Answer 12

megospore—– this grows in cell and obtains nutrioon from nucellus

Question 13

the functional gametogenesis divides mitocally to form

Answer 13

2 nuclei

Question 14

each nucleus moves towards towads the opposite pole forming

Answer 14

2 nucleate embroyo sac