Chapter 38- reproduction of flowering plants

Question 1

Where does flower develop from?

Answer 1

They develop from floral bud.

Question 2

What does the floral bud consists of?

Answer 2

it consists of apical meristem which give rise to reproductive organs.

Question 3

what do we call the collection of petals?

Answer 3

We call them corolla

Question 4

What do we call the collection of sepals?

Answer 4

We call them calyx

Question 5

How many cells does the pollen grain have?

Answer 5

They have typically two celled male gametophyte contained in the wall of microspores

Question 6

What are the two cells in pollen grain?

Answer 6

1. large tube cell

2. small tube cell

Question 7

What is the function of large tube cell?

Answer 7

1. store protein and lipid for later stages.

2. they form the pollen tube

Question 8

What is the function of small tube cell?

Answer 8

It is small generative cell that divide into two sperm after pollination.

Question 9

what surround the pollen grain?

Answer 9

1. pollen wall

2. pollen coat

Question 10

What is the pollen wall made out of?

Answer 10

the pollen wall made out of a tough resistant biopolymer material called sporpolenin

Question 11

What is the function of pollen coat?

Answer 11

it surround the wall of the pollen grain and it include lipid and protein to aid in the attachment to the stigma.

Question 12

What are the 7 cells in the embryo sac?

Answer 12

1. egg cell
2. large central cell with 2 polar nuclei
3. 3 antipodal cell
4. 2 supportive synergids

Question 13

What is pollination?

Answer 13

It is the delivery of pollen to the stigma of a pistil by wind or animal pollinator.

Question 14

What is the process that causes the pollen tube to grow?

Answer 14

It is called tip growth.

Question 15

What are the steps of pollen tube elongation?

Answer 15

1. New cytoplasm and new cell material are added to the pollen tube by golgi vesicles.
2. Plugs of the polysaccharides callose seals off older parts of the pollen tube.

Question 16

What part determine if the pollen is compatible or not?

Answer 16

The stigma

Question 17

What is endosperm?

Answer 17

it is rich in starch, protein, lipid, vitamins and minerals supplied by the parents sporophyte.

Question 18

What does the endosperm feed or supply foods for?

Answer 18

it supplies nutritional needs for the developing embryo and often the young seedlings

Question 19

What does the zygote divide into?

Answer 19

1. small terminal cell which become embryo

2. large basal cell which become suspensor.

Question 20

How does the early embryo get his food?

Answer 20

it gets its food directly by parents through the suspensor.

Question 21

How does the old embryo get his food?

Answer 21

He get his food from endosperms

Question 22

where does the seed coat develop from?

Answer 22

it develop form the integuments of the ovule. (sclereid cells)

Question 23

What is the function of the seed coat?

Answer 23

1. serves as water and oxygen barrier

2. shields embryo from UV radiation and microbial attack.

Question 24

What is imbitition?

Answer 24

It is absorption of water to rehydrate and activate the embryo.