Living environment SHS Reproduction

The process of mitosis insures equal distribution to the new cells of the (1) mitochondria (2) cytoplasm (3) chromosomes (4) chloroplasts

Answer: 3 chromosomes

German measles is a disease that can harm an embryo if the mother is infected in the early stages of pregnancy because the virus that causes German measles is able to (1) be absorbed by the embryo from the mother's milk (2) be transported to the embryo in red blood cells (3) pass across the placenta (4) infect the eggs

Answer: 3 pass across the placenta

A large number of sperm cells are produced by males every day. This large number of sperm cells increases the chance that (1) at least one sperm cell will be reached when the eggs swim toward the sperm cells in the ovary (2) several sperm cells will unite with an egg so the fertilized egg will develop properly (3) some of the sperm cells will survive to reach the egg (4) enough sperm cells will be present to transport the egg from where it is produced to where it develops into a fetus

Answer: 3 some of the sperm cells will survive to reach the egg

The presence of a cancerous mass in the lung is a direct result of (1) the introduction of toxins through breaks in the skin (2) prolonged exposure to very dry air (3) the uncontrolled division and growth of abnormal cells (4) meiotic division of normal cells

Answer: 3 the uncontrolled division and growth of abnormal cells

A piece of stem was cut from a plant and was placed in a cup of water. After two weeks, roots formed. Which method of reproduction was demonstrated by this procedure? (1) regeneration (2) sexual reproduction (3) vegetative propagation (4) budding

Answer: 3 vegetative propagation

Which sequence represents the order of some events in human development? (1) zygote → sperm → tissues → egg (2) fetus → tissues → zygote → egg (3) zygote → tissues → organs → fetus (4) sperm → zygote → organs → tissues

Answer: 3 zygote → tissues → organs → fetus

As a result of mitotic cell division, a cell having 80 chromosomes gives rise to two cells each of which has a chromosome number of (1) 10 (2) 20 (3) 40 (4) 80

Answer: 4 80

During binary fission, which is true of a daughter cell? (1) It has one-half as many chromosomes as the parent cell. (2) It has the same number of chromosomes as the parent cell and is the same size as the parent. (3) It has twice as many chromosomes as the parent cell. (4) It has as many chromosomes as the parent cell, but is smaller.

Answer: 4 It has as many chromosomes as the parent cell, but is smaller.

Which statement best describes the relationship between the blood of a human fetus and the blood of the mother? (1) Their blood systems are separate only at certain times in development and connected at other times. (2) The blood flows directly from the mother into the fetus. (3) Their blood systems are separate and no materials are exchanged. (4) Their blood systems are separate, but certain materials pass from one to the other.

Answer: 4 Their blood systems are separate, but certain materials pass from one to the other.

Which cell is normally produced as a direct result of meiosis? (1) a uterine cell having half the normal species number of chromosomes (2) an egg having the full species number of chromosomes (3) a zygote having the full species number of chromosomes (4) a sperm having half the normal species number of chromosomes

Answer: 4 a sperm having half the normal species number of chromosomes

Human egg cells are most similar to human sperm cells in their (1) degree of motility (2) amount of stored food (3) chromosome number (4) shape and size

Answer: 3 chromosome number

Which statement concerning production of offspring is correct? (1) Production of offspring is necessary for a species to survive, but it is not necessary for an individual to survive. (2) An organism can reproduce without\ performing any of the other life processes. (3) Production of offspring is necessary for an individual organism to survive, while the other life processes are important for a species to survive. (4) Reproduction is a process that requires gametes in all species.

Answer: 1 Production of offspring is necessary for a species to survive, but it is not necessary for an individual to survive.

If an organism reproduces asexually, its offspring will most likely be (1) genetically identical to the parent (2) genetically different from each other (3) produced as a result of fertilization (4) produced from specialized cells known as gametes

Answer: 1 genetically identical to the parent

In sexually reproducing species, the number of chromosomes in each body cell remains the same from one generation to the next as a direct result of (1) meiosis and fertilization (2) mitosis and mutation (3) differentiation and aging (4) homeostasis and dynamic equilibrium

Answer: 1 meiosis and fertilization

The chromosomes in the young plants growing from the leaf are produced by (1) mitosis (2) meiosis (3) sporulation (4) buds

Answer: 1 mitosis

A runner develops new strawberry plants which develop into new individuals. This best illustrates the process of (1) vegetative propagation (2) gametogenesis (3) meiosis (4) regeneration

Answer: 1 vegetative propagation

Which statement best explains why some cells in the reproductive system only respond to certain hormones? (1) These cells have different DNA than the cells in other body systems. (2) These cells have specific types of receptors on their membranes. (3) Reproductive system cells could be harmed if they made contact with hormones from other body systems. (4) Cells associated with the female reproductive system only respond to the hormone testosterone.

Answer: 2 These cells have specific types of receptors on their membranes.

If an organism reproduces sexually, its offspring will most likely be (1) genetically identical to the parent (2) genetically different from each other (3) produced as a result of in vitro fertilization (4) produced from specialized cells known as somatic cells

Answer: 2 genetically different from each other

Which hormone does not directly regulate human reproductive cycles? (1) testosterone (2) insulin (3) estrogen (4) progesterone

Answer: 2 insulin

Which phrase does not describe cells cloned from a carrot? (1)theyaregeneticallyidentical (2) they are produced sexually (3)they have the same DNA codes (4)they have identical chromosomes

Answer: 2 they are produced sexually

Which is NOT an advantage of grafting? (1) The graft is identical to the parent plant it is obtained from. (2) Grafting allows the propagation of seedless fruits. (3) The graft combines the characteristics of the stock and scion in the graft. (4) Grafting may allow for the faster production of desirable fruits.

Answer: 3 The graft combines the characteristics of the stock and scion in the graft.

When a mushroom releases spores this exemplifies (1) meiosis (2) gametogenesis (3) asexual reproduction (4) binary fission

Answer: 3 asexual reproduction

Which method of reproduction is carried on by the paramecium? (1) budding (2) sporulation (3) binary fission (4) multiple fission

Answer: 3 binary fission

The uncontrolled division of abnormal cells may result in (1) hemophilia (2) Down syndrome (3) cancer (4) albinism

Answer: 3 cancer