chapter 18- development

Question 1

a solid ball of embryonic cells is called

Answer 1

morula

Question 2

a fluid filled cavity is called

Answer 2

blastocoel

Question 3

hallow sphere

Answer 3

bastua

Question 4

what are the 4 extra embryonic membranes of the placenta and umbilical cord called

Answer 4

amnion, chorion, allanotis and yolk sac

Question 5

of the extra embryonic membranes of the placenta and umbilical cord which one is a thin tough membrane consisting of watery fluid called amniotic sac

Answer 5

amnion

Question 6

of the extra embryonic membranes of the placenta and umbilical cord which one completely surrounds the amnion and where placenta formation begins and assets with transfer of nutrients from mother to fetus

Answer 6

chorion

Question 7

of the extra embryonic membranes of the placenta and umbilical cord which one develops as an out pocketing of the gut and its vessels connects the fetus to the mother

Answer 7

allantois

Question 8

of the extra embryonic membranes of the placenta and umbilical cord which one is the site of early development of blood vessels and becomes associated with the umbilical vessels

Answer 8

yolk sac

Question 9

what layer makes up the integumenty system, hair, nails, epithelium of the nose, mouth, anal cavity, lens of the eye, retina and nervous system

Answer 9

ectoderm

Question 10

what layer makes up the musculoskeletal system, circulatory system, excretory system, gonads, connective tissue throughout the body and portions of the digestive and respiratory organs

Answer 10

mesoderm

Question 11

what layer makes up the epithelial singing of the digestive and respiratory tract including the lungs, parts of the liver, pancreas, thyroid and bladder lining

Answer 11

ectoderm

Question 12

what is the rod made of messier causes ectoderm to bend inward and forma groove along the dorsal surface of the embryo

Answer 12

notochord

Question 13

what layer makes up the neural tube

Answer 13

dorsal ectoderm folds

Question 14

what are the cells at the tip of the neural folds called

Answer 14

neural crest cells

Question 15

in what trimester does the eyes gonads limbs liver cartilaginous skeleton turns to bone and embryo can be called a fetus

Answer 15

first

Question 16

in what trimester does fingers toes elongate, face appears human and has tremendous growth

Answer 16

second

Question 17

what trimester has rapid growth, and more growth of brain

Answer 17

third

Question 18

what happens to the cervix during labor

Answer 18

thins and dilates

Question 19

biological agents that cause congenital disorders

Answer 19

teratogens

Question 20

what is double fertilization in angiosperms

Answer 20

one sperm fertilizes the egg and other the endosperm

Question 21

do gymnosperms have endosperm

Answer 21

no

Question 22

what is a sexual diploid stage called

Answer 22

sporophyte

Question 23

what is a sexual haploid stage called

Answer 23

gametophyte

Question 24

in seeds what part is the precursor of the upper stem and leaves

Answer 24

epicotyl

Question 25

in seeds what part is the seed leaves; monocot or dicot

Answer 25

cotyledons

Question 26

in seeds what part is the lower stem and root

Answer 26

hypocotyl

Question 27

in seeds what part is feeds the embryo in angiosperm

Answer 27

endosperm

Question 28

in seeds what part is develops from the outer covering of the ovule, the embryo and its seed coat together comprise the seed

Answer 28

seed coat

Question 29

what type of cells cause cell elongation and differentiate into cells types characteristic of the species

Answer 29

meristem

Question 30

what type of meristem is found at the tips of roots an stem

Answer 30

apical

Question 31

which type of meristem is found between the xylem and phloem giving growth in diameter

Answer 31

lateral ( cambium)