3.4 Development Of The Zygote

Question 1

Embryo

Answer 1

-name given to zygote once it begins to divide by mitosis
-the embryo is the developing organism
-the embryos of sexually reproducing organisms are protected when they develop inside seeds, eggs, or the mother

Question 2

Seeds

Answer 2

-once the egg has been fertilized in the ovary of the flower, it is called a seed
-the seed contains the embryo, as well as stored food
-this food nourishes the developing plant until it is able to produce its own food using photosynthesis
-the food in the seed is in the form of starch or sugar
-Much of the world’s food comes from the seeds of three plants: corn, rice, wheat
-sometimes the fruit that surrounds the seeds contains sugar and taste sweet, apples, and tomatoes are fruits we eat because of their sweet taste

Question 3

Seed anatomy

Answer 3

-flowering plants produce two types of seeds

Question 4

Cotyledons

Answer 4

Seeds containing seed leaves

Question 5

Dicotyledons

Answer 5

-bean plants are examples because they produce seeds with two leaves

Question 6

Monocotyledons

Answer 6

-corn plants are examples because they produce seeds with only one cotyledon

Question 7

Radicle

Answer 7

-part of the embryo that will develop into the roots

Question 8

Epicotyl

Answer 8

-part that becomes the stem and the leaves

Question 9

Hypocotyl

Answer 9

-what pushes up through the soil and protect the epicotyl

Question 10

Epicotyl

Answer 10

-goes straight up through a tube

Question 11

Eggs

Answer 11

-vast majority of animals lay eggs
-eggs that are laid contain the zygote, some nutrients, and a mechanism for protection, such as a shell, a jelly like substance, or an egg case
-some animal suggest tapeworms produce a single egg case that contains thousands of

Question 12

Amniotic egg

Answer 12

The eggs of reptiles and birds that contain a single embryo surrounded by a shell

Question 13

parts of an amniotic egg

Answer 13

-amnion: fluid filled sack
-yolk sac: stores food for the embryo
-allantois: holds wastes produced by the embryo
-chorion-controls the movement of gases and waste in and out of the egg
-alubmen-cushions the embryo and is an additional source of food 

Question 14

Embryo’s develop in the mother

Answer 14

-embryos of all mammals except spiny anteaters and platypus develop inside mother

Question 15

Planceta

Answer 15

Organ that develops around fetus and connects to mother

Question 16

Fetus

Answer 16

-attatched to planceta via umbilical cord

Question 17

Umbilical cord

Answer 17

-carries wastes out of the fetus and nutrients into the fetus