Reproduction And Co-ordination Quiz Grade 9 Science

The correct answer is uterus. The uterus is a hollow muscular chamber where the fertilized ovum implants and grows into a baby during pregnancy. It provides a nourishing environment for the developing fetus and expands to accommodate its growth. The terms "uterus" and "womb" are often used interchangeably to refer to this reproductive organ in females.

A haploid cell contains half the number of chromosomes compared to a diploid cell. In humans, a diploid cell has 46 chromosomes, so a haploid cell would have half of that, which is 23 chromosomes. This is because during meiosis, the process of cell division that produces gametes (sperm and egg cells), the chromosome number is halved to ensure that when fertilization occurs, the resulting zygote has the correct number of chromosomes.

Sexual reproduction involves the fusion of gametes to form a fertilized egg. This process requires the combination of genetic material from two parent organisms, typically a male and a female, resulting in offspring that inherit traits from both parents. Sexual reproduction promotes genetic diversity and variation within a species, as it allows for the shuffling and recombination of genetic material through processes such as meiosis and fertilization.

The urethra is the tube that carries urine out of the body. It is a muscular tube that connects the bladder to the external opening of the body. When the bladder is full, the muscles in the urethra relax, allowing urine to flow out of the body. In males, the urethra also carries semen during ejaculation.

The plate-like structure joined to the fetus by the umbilical cord is called the placenta. The placenta is an organ that develops during pregnancy and serves as a connection between the mother and the developing fetus. It provides oxygen and nutrients to the fetus, removes waste products, and helps in hormone production. The placenta plays a crucial role in the growth and development of the fetus throughout pregnancy.

The fertilized egg implants in the uterus or womb. After fertilization, the egg travels down the fallopian tube and reaches the uterus where it attaches itself to the uterine lining. This is where the embryo will develop and receive nourishment throughout pregnancy. The terms "uterus" and "womb" are used interchangeably to refer to the same reproductive organ in females where implantation occurs.

The head of the sperm contains the nucleus and genetic material. The nucleus is responsible for carrying the genetic information, including the DNA, that will be passed on to the offspring. The genetic material in the sperm head combines with the genetic material from the egg during fertilization to create a unique set of genes for the new individual. The mid-piece and tail of the sperm have other important functions, such as providing energy for the sperm to swim towards the egg, but they do not contain the nucleus or genetic material.

The pancreas is an organ that plays a crucial role in regulating glucose levels in the blood. It produces and releases insulin, a hormone that helps to control the amount of sugar in the bloodstream. Insulin allows cells to take in glucose from the blood, which is then used for energy or stored for later use. When blood sugar levels are too high, the pancreas releases more insulin to lower them. Conversely, when blood sugar levels are too low, the pancreas releases glucagon, another hormone that helps to raise blood sugar levels. Overall, the pancreas helps to maintain the balance of glucose in the bloodstream.

A condom and diaphragm are both examples of physical barriers to sperm. These devices physically block the sperm from entering the cervix and reaching the egg, thus preventing fertilization.

Binary fission, budding, and runners are all examples of asexual reproduction. In binary fission, a single organism divides into two identical daughter cells. Budding involves the formation of a small outgrowth on the parent organism, which eventually detaches and becomes a new individual. Runners, also known as stolons, are horizontal stems that grow above the ground and produce new plants at their nodes. These methods of reproduction do not involve the fusion of gametes and result in offspring that are genetically identical to the parent organism.

The prostate gland produces fluid that helps sperm survive their journey into the vagina, uterus, and fallopian tubes. This fluid, known as prostatic fluid, contains nutrients and enzymes that nourish and protect the sperm, increasing their chances of successfully fertilizing an egg.

The gap between neurons is called a synapse. A synapse is a small junction or gap between two neurons where information is transmitted from one neuron to another. It is an essential part of the communication process in the nervous system, allowing signals to pass from one neuron to the next.

Asexual reproduction involves the multiplication of organisms by simple division, where a single parent organism divides into two or more identical offspring. This type of reproduction does not involve the fusion of gametes or the genetic contribution of two parents. Instead, the offspring are genetically identical clones of the parent. Therefore, both "asexual" and "asexual reproduction" are correct answers to the question.

Oestrogen is a hormone that plays a crucial role in the menstrual cycle. It stimulates the uterus to build up its lining, known as the endometrium, in preparation for a potential pregnancy. This lining provides a nourishing environment for a fertilized egg to implant and develop. If fertilization does not occur, the decrease in oestrogen levels triggers the shedding of the uterine lining, resulting in menstrual bleeding. This process occurs in each menstrual cycle unless pregnancy occurs.

In a diploid cell, there are 46 chromosomes. A diploid cell contains two sets of chromosomes, one set inherited from each parent. Each set consists of 23 chromosomes, resulting in a total of 46 chromosomes in a diploid cell. This is the typical chromosome count in human cells, with the exception of gametes (sperm and egg cells) which are haploid and contain only 23 chromosomes.

Motor neurons are specialized nerve cells that transmit signals from the brain and spinal cord to the muscles, causing them to contract and produce movement. These neurons play a crucial role in the coordination and control of voluntary movements. When the motor neurons fire, they stimulate the muscle fibers to contract, resulting in movement. Therefore, the statement "cause movement in the muscle" accurately describes the function of motor neurons.

Fertilization is the fundamental process in sexual reproduction where a sperm cell from the male parent fuses with an egg cell from the female parent. This fusion creates a single cell called a zygote, which contains the combined genetic material from both parents. The zygote then undergoes a series of cell divisions and development to eventually form a new individual. Fertilization marks the beginning of the development of a new organism and is essential for the continuation of the species.

Miosis is a type of cell division that occurs in multicellular organisms. It is responsible for the production of gametes (reproductive cells) such as sperm and eggs. During meiosis, the number of chromosomes in the parent cell is halved, resulting in genetically diverse offspring. This process is essential for sexual reproduction in multicellular organisms, allowing for genetic variation and evolution. Therefore, the statement "miosis is used in multicellular organisms" is true.

Implantation is a crucial step in early pregnancy where the blastocyst, a hollow ball of cells formed from the fertilized egg, embeds itself into the endometrium, the lining of the uterus. This attachment allows the blastocyst to receive nutrients and oxygen from the mother's bloodstream, facilitating further development of the embryo. Successful implantation is essential for the establishment and continuation of pregnancy.

The vas deferens, also known as the ductus deferens, carries sperm from the testicles to the urethra. It is a long, muscular tube that connects the epididymis (where sperm mature) to the ejaculatory ducts. During ejaculation, the muscles in the vas deferens contract, propelling the sperm forward into the urethra, where it can then be expelled from the body.

they use both axons and dendrons

During the embryo stage, the baby develops inside the lining of the uterus and forms its internal and external structures. This is a crucial period of development where major organs and body systems are formed. Therefore, the statement "During the babies embryo stage the baby develops under the lining of uterus and develops most of its internal and external structures" is true.

The central nervous system includes the brain and spinal cord. These two components are responsible for coordinating and controlling the body's activities. The brain is the command center of the nervous system, receiving and processing information from the senses and sending out signals to the rest of the body. The spinal cord acts as a pathway for communication between the brain and the rest of the body, transmitting signals to and from the brain. Together, the brain and spinal cord play a crucial role in regulating bodily functions and maintaining homeostasis.

The mid-piece of the sperm contains mitochondria, which are responsible for providing energy to the sperm. These mitochondria produce ATP (adenosine triphosphate), which is the energy currency of the cell. This energy is essential for the sperm to swim and move towards the egg during fertilization. Therefore, the presence of mitochondria in the mid-piece of the sperm is crucial for its function and successful fertilization.

Mitosis is the process of cell division that occurs in unicellular organisms during asexual reproduction. It allows the organism to produce genetically identical daughter cells, ensuring that the genetic information is passed on accurately. Therefore, mitosis is indeed used in asexual reproduction in unicellular organisms.

The correct answer is "vagina, out the vagina." If an egg is not fertilized, it will travel through the fallopian tubes and into the uterus. From there, it will be expelled out of the body through the vagina during menstruation.

Mitosis is a type of cell division that results in two daughter cells with the same chromosome number as the parent cell. During mitosis, the chromosomes replicate and then separate into two identical sets, ensuring that each daughter cell receives the same number of chromosomes as the parent cell. Therefore, the statement that mitosis does not affect the chromosome number in the final cell is true.

During pregnancy, the foetus receives essential nutrients and oxygen from the mother's blood through the placenta. These substances diffuse from the mother's blood vessels into the foetus' blood vessels in the placenta. Oxygen is necessary for the foetus' respiration, while food (nutrients) provides energy and nourishment for its growth and development. Therefore, both food and oxygen diffuse into the foetal blood from the mother's blood.

In meiosis, the diploid cell undergoes a process where it first duplicates its genetic material, resulting in two copies of each chromosome. Then, it divides into two cells, each containing one copy of each chromosome. These cells then undergo a second division, resulting in four haploid cells, with each cell containing only one copy of each chromosome. This process is important for the production of gametes (sperm and eggs) in sexual reproduction.

The mini pill, also known as the progestin-only pill, indeed only contains progesterone. It is a form of birth control pill that does not contain estrogen, making it a suitable option for women who cannot or prefer not to take estrogen-based contraceptives. Progesterone-only pills work by thickening the cervical mucus, thinning the lining of the uterus, and sometimes by suppressing ovulation. Therefore, the statement "The mini pill only contains progesterone" is true.

The vagina is the correct answer because it is a muscular tube that serves as the entry point for sperm from the male during sexual intercourse. It connects the uterus to the external genitalia and is responsible for receiving the penis during intercourse and allowing the passage of sperm into the reproductive system. The cervix, fallopian tube, and urethra are not the correct answers as they have different functions and are not specifically related to the entry point for sperm from the male.

The correct answer is "gamete, fertilisation, zygote, blastocyst, embryo, fetus". This sequence accurately represents the order of a baby's life cycle. The process begins with the formation of gametes (sperm and egg), followed by fertilization when the sperm and egg fuse to form a zygote. The zygote then undergoes cell division and forms a blastocyst, which implants itself into the uterus. The blastocyst develops into an embryo, which eventually develops into a fetus.

In mitosis, DNA does not double and divide by four. Instead, the DNA replicates and divides into two identical sets of chromosomes. Each set of chromosomes then moves to opposite ends of the cell, resulting in the formation of two identical daughter cells with the same number of chromosomes as the parent cell. Therefore, the statement that DNA doubles and divides by four in mitosis is incorrect.

Sensory nerve fibers are indeed dendrons. Dendrons are a type of nerve fiber that carries sensory information from the peripheral nervous system to the central nervous system. These fibers are responsible for transmitting sensory signals such as touch, pain, temperature, and proprioception from sensory receptors to the brain. Therefore, the statement "sensory nerve fibers are dendrons" is true.

The correct answer is "sperm nucleus, sperm and eggs nucleus." Fertilization is the process in which the nucleus of a sperm cell fuses with the nucleus of an egg cell, resulting in the combination of genetic material from both parents. The sperm nucleus contains the genetic material from the father, while the eggs nucleus contains the genetic material from the mother. The fusion of these nuclei is essential for the formation of a new individual with a unique combination of genetic traits.

When the baby is a zygote, it undergoes a process called cell division, where the single cell divides repeatedly. This division leads to the formation of more cells, which eventually develop into the various tissues and organs of the developing baby. The zygote attaches to the lining of the uterus after fertilization, but this is not specifically mentioned in the answer. Similarly, the development of internal organs is a subsequent stage in the baby's growth and is not directly related to the zygote stage.

To determine the correct order of the nervous system's response process, we should understand the typical flow of information from the initial detection of a stimulus to the resulting action. Here’s the general pathway:

Stimulus: An external or internal change that activates sensory receptors.

Sensory Receptors: Specialized cells or structures that detect changes in the environment (stimuli).

Sensory Neurons: Nerve cells that transmit sensory information from receptors to the central nervous system (CNS).

Central Nervous System (CNS): The CNS processes and interprets sensory information and determines the appropriate response. The CNS includes the brain and spinal cord.

Motor Neurons: Nerve cells that convey commands from the CNS to muscles and glands (effectors).

Effectors (Muscles or Glands): Organs that produce the final response.

Action Response: The physical or physiological activity that occurs in response to the processed stimulus.

motor nerves conduct impulses from the cns to the muscles or glands sensory nerves conduct messages from sensory receptors to cns

Ovaries are large because they hold all the nutrients needed for the potential baby. The ovaries play a crucial role in reproduction by producing and releasing eggs, which contain all the necessary nutrients for the development of a fetus. These nutrients are essential for the survival and growth of the potential baby. Therefore, the large size of ovaries ensures that they can accommodate and provide the required nutrients for the development of a healthy fetus.

The thyroid gland is responsible for regulating cell growth and activity. It produces hormones that control metabolism and influence the function of almost every organ in the body. These hormones help to regulate the rate at which cells convert food into energy, and they also play a role in the growth and development of tissues. Therefore, the correct answer is that the thyroid gland regulates cell growth and activity.

The nervous system is responsible for transmitting signals throughout the body. It uses electric messages to send information along nerve fibers, allowing for fast communication. These messages are short-lasting, meaning they do not persist for a long time. Additionally, the nervous system plays a crucial role in coordinating different bodily functions, making it responsible for carrying out coordination.

The contraceptive pill typically contains synthetic hormones (estrogen and progestin) that work together to prevent pregnancy by primarily inhibiting ovulation (option a). Additionally, it thickens cervical mucus (option b), which hinders sperm movement and fertilization. In some cases, it may also thin the lining of the uterus (option c), making it less conducive for implantation.

Cell division is used for repair, growth, asexual reproduction, and sexual reproduction. Repair involves the replacement of damaged or dead cells with new cells through cell division. Growth occurs as cells divide and increase in number, leading to the growth of tissues and organs. Asexual reproduction involves the production of genetically identical offspring through cell division. Sexual reproduction involves the fusion of two gametes, which are produced through cell division, to form a new individual with genetic variation.

The given options - Pills, injections, and implants - all refer to different forms of hormonal contraception. These methods work by releasing synthetic hormones into the body, which can prevent ovulation. The pill is a daily oral contraceptive, while injections and implants are long-acting methods that release hormones over a prolonged period. These hormonal contraceptives create a chemical barrier to ovulation, inhibiting the release of an egg from the ovaries and, therefore, preventing pregnancy.

Sensory nerves (afferent) carry sensory information from the body to the central nervous system, while motor nerves (efferent) transmit signals from the central nervous system to muscles and glands. Mixed nerves contain both sensory and motor fibers.

In the ovary, eggs mature and oestrogen is produced. The ovaries are responsible for the production and release of eggs during the menstrual cycle. As the eggs mature, they prepare for potential fertilization. Additionally, the ovaries produce hormones such as oestrogen, which plays a crucial role in regulating the menstrual cycle and preparing the uterus for potential pregnancy. Therefore, both the maturation of eggs and the production of oestrogen occur in the ovary.

The peripheral nervous system includes spinal nerves and nerves to all parts of the body. The brain is part of the central nervous system, not the peripheral nervous system. Nerve fibers are also included in the peripheral nervous system, as they transmit signals between the central nervous system and the rest of the body.

The pituitary gland is a small gland located at the base of the brain. It plays a crucial role in regulating various bodily functions. It controls growth and development by releasing growth hormone, which stimulates the growth of bones, muscles, and other tissues. The pituitary gland also controls water balance by releasing antidiuretic hormone (ADH), which regulates the amount of water reabsorbed by the kidneys. During childbirth, the pituitary gland releases oxytocin, which stimulates contractions of the uterus. Additionally, the pituitary gland stimulates the release of breast milk by producing prolactin, a hormone that triggers milk production in the mammary glands.