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WorksheetsSec 3 / flower - fertilization
Total questions: 40
Worksheet time: 40mins
The figure shows the structure of the placenta. Blood from the mother and the fetus never mix but they come close together for the exchange of materials between the two within the placenta.
Which structure represents the maternal circulation?
A
E
C
B
D
What is a characteristic of monozygotic twins?
They are not genetically identical.
They are formed from 1 egg and 2 sperm.
They are always the same sex.
They develop with the same umbilical cord.
Which feature correctly describes fraternal twins?
They are formed from one egg and two sperm.
They are formed from a single zygote.
They must be the same sex.
They have the same DNA.
They are formed from two eggs and two sperm.
Which embryonic structure develops into the placenta?
Inner cell mass
Umbilical cord
Chorion
Amnion
Neural tube
How many chromosomes are in a human zygote?
46 plus 2 sex chromosomes
46, including 2 sex chromosomes
46, including 1 sex chromosome
23, including 1 sex chromosome
23 plus 1 sex chromosome
The figure shows a fetus developing in the uterus. What is the name and function of X?
The chorionic fluid that secretes hormones
The amniotic fluid that protects the fetus
The amniotic fluid that secretes hormones
The amniotic fluid that allows the exchange of materials with the mother
The chorionic fluid that allows the exchange of materials with the mother
Which organ system is the first to begin development in the early embryo?
Reproductive system
Respiratory system
Digestive system
Nervous system
Skeletal system
What usually happens when a zygote develops into two embryos?
They develop into identical twins, each with a separate placenta.
They develop into identical twins that share a placenta.
They develop into fraternal twins, each with a separate placenta.
They develop into fraternal twins with a shared amnion.
They develop into fraternal twins that share a placenta.
What is the significance of the acrosome reaction in fertilization?
It triggers meiosis II inside the egg cell.
It causes the outer jelly coat of the egg to change so that no other sperm can enter.
It releases enzymes that allow a sperm to penetrate the outer jelly coat of the egg.
It releases enzymes that digest the first polar body.
It dissolves the follicle cells surrounding the egg, allowing the sperm to reach the egg cell membrane.
What occurs during the renucleation (nuclear transfer) process?
A diploid body cell nucleus is replaced by a haploid nucleus from an egg cell.
A haploid egg nucleus is replaced by a haploid nucleus from a body cell.
A diploid body cell nucleus is replaced by a haploid nucleus from a sperm cell.
A haploid egg nucleus is replaced by a diploid nucleus from a body cell.
A haploid sperm nucleus is replaced by a diploid nucleus from a body cell.
What is stored at very cold temperatures in gamete banks?
Fertilized eggs
Embryos
Sperm only
Unfertilized eggs and sperm
Unfertilized eggs only
Which of the following is not a use of gamete banks?
A woman can have her eggs frozen before chemotherapy to allow her the chance of having children later.
Frozen sperm can be used to produce clones by renucleation.
Stored gametes from an endangered species can prevent extinction through artificial reproduction.
Donated sperm can be used by infertile couples wanting to conceive a child.
Farmers can use frozen sperm from animals with desired characteristics for selective breeding.
Sperm samples from farm animals can be separated into X- and Y-chromosome-containing sperm cells and stored in liquid nitrogen until needed. In which situation might this procedure be beneficial to farmers?
To prioritize meat production in sheep by using sperm cells containing X chromosomes
To prioritize milk production in sheep by using sperm cells containing Y chromosomes
To prioritize meat production in cattle by using sperm cells containing X chromosomes
To prioritize milk production in cattle by using sperm cells containing Y chromosomes
To prioritize milk production in cattle by using sperm cells containing X chromosomes
The two sheep in the figure shown were used in a renucleation procedure. Eggs were obtained from sheep 1, and skin cells were obtained from sheep 2.
What would the genetic makeup of the offspring produced by this process be?
The offspring would be genetically identical to sheep 2.
The offspring would be genetically identical to sheep 1.
The offspring would be genetically different to sheep 1 and sheep 2.
The offspring would be completely black in color.
The offspring would be completely white in color.
Which of these structural features of a flower would not reduce the likelihood of self-pollination?
Carpels mature before stamens.
Flowers have only stamens or only carpels (unisex).
Stamens are positioned higher than the stigma.
Stamens mature before carpels.
Stamens are positioned lower than the stigma.
Which of these structural features is present in wind-pollinated flowers?
Scented flowers
The presence of nectaries
Brightly colored petals
Large numbers of pollen grains
Large pollen grains
Where in a flower is the haploid megaspore located?
Ovule
Receptacle
Anther
Stigma
Style
The flowers of a tomato plant were sprayed with indole acetic acid (IAA). How would this chemical affect the fruit the plant produces?
The tomato fruit would taste less sweet.
The plant would produce seedless fruits.
The tomato fruit would be smaller.
The tomato fruit would have larger seeds.
What word describes the ripened ovary wall that forms a fleshy fruit?
Parthenocarpy
Perianth
Receptacle
Pericarp
What happens to an annual plant after it has produced flowers, fruits, and seeds?
It stops growing for a year and then flowers again.
It dies soon after producing seeds, completing its life cycle in one growing season.
It continues growing and flowers again once every year.
It carries on growing for another year and then dies.
During in-vitro fertilization, female is injected with a drug containing ........................ which stimulates the production of ova
androgen hormone
follicle stimulating hormone
luteinizing hormone
thyroid stimulating hormone
Which of the following statements about test tube babies is true? ...................
There is an increased chance of having fraternal twins.
There is an increased chance of having identical twins.
There is an increased chance of success if the parents are older.
It is only a suitable procedure if the female is sterile
Where are embryos placed in the final stage of the test tube babies process?
Uterus
Cervix
Ovary
Vagina
Fallopian tube (oviduct)
The product of fertilization is called an embryo sac.
True
False
Once inside the ovule, the pollen tube releases four male gametes into the embryo sac.
True
False
One pollen tube grows right through the anther and reaches the ovary.
True
False
Embryonic sac is plants is formed from cells contain………….
N
2N
3N
0.5N
No. of chromosomes in the generative nucleus of pollen grain equals the no. of chromosomes in…………..…
Endosperm nucleus
antipodal cells
embryo cells
None of them
The no. of spore mother cells which produce 20 microspores is ..........................
10
20
80
5
External fertilization and internal embryonic development happens in ...................
Bony fish
reptiles
birds
test tube baby
Pollen grains are produced by………………
Only mitosis
only meiosis
mitosis followed by meiosis
meiosis followed by mitosis
If the no. of chromosomes in generative nucleus is X, the no. of chromosomes in tube nucleus is………………
2X
3X
X
0.5X
The no. of male nuclei in pollen grains that can produce from 4 spore mother cells ..................................
4
8
16
32
The flower functions include all of the following except : ……………………
the formation of pollen grains and ovules
the production of fruits and seeds
the production of buds
the occurrence of pollination and fertilization
If the number of chromosomes in the pea plant cell is 7 pairs of chromosomes , so the number of chromosomes in the embryo of the plant will be ……………
7
14 pairs
21
14
If the nucleus of a plant cell contains 30 chromosomes, the endospermic nucleus of the same plant contains …………… chromosomes
15
60
45
30
The no. of cells which degenerate during the maturation of the ovule in the plant is ...........................
2
3
4
5
If the number of chromosomes in the microspore nucleus is (X), so the number of chromosomes in the male nucleus will be ………………….
2X
X
3X
None of them
The antipodal cells are formed inside the ovary of the flowering plants by ………........................
Mitotic division only.
Meiotic division only.
Mitosis followed by meiosis.
Meiosis followed by mitosis.
The no. of antipodal cells produced in 10 ovules is ……...............…
10
20
30
40
