All questions of Reproduction and Endocrine System for Class 8 Exam

Both sexual and asexual

because dog ,cat ,human being reproduce by sexual method
&
amoeba and hydra like animal reproduce sexually like binary fission and budding

Ans (c) is right

Thanks*-*

Correct answer is option 'B' Earthworm

In earthworm development is direct which means no level stage and hence no metamorphosis

Introduction:
Viviparity refers to the reproductive strategy in which offspring develop inside the mother's body and are born alive. The mother provides nourishment and protection to the developing embryos until birth. Most mammals are viviparous, but there are exceptions. In this case, we need to identify the animal that is not viviparous.

Explanation:
Among the options given, the correct answer is option 'C', Snake. Snakes are not viviparous; instead, they are oviparous, meaning they lay eggs.

Viviparous Animals:
1. Goat: Goats are mammals, and like most mammals, they are viviparous. The female goat carries the developing embryos inside her body until the offspring are fully developed and ready for birth.

2. Tiger: Tigers are also viviparous. The female tiger carries the developing embryos inside her body until they are ready for birth. Tigers, like other big cats, give birth to live young rather than laying eggs.

3. Snake: Snakes are not viviparous. They are oviparous, meaning they lay eggs. Female snakes typically lay a clutch of eggs, which are then incubated until they hatch. The young snakes emerge from the eggs fully formed and independent.

4. Dog: Dogs are viviparous. The female dog carries the developing embryos inside her body until they are ready for birth. Dogs, like most mammals, give birth to live young rather than laying eggs.

Conclusion:
Among the given options, snakes are the only non-viviparous animals. Snakes lay eggs and are oviparous rather than giving birth to live young. Goats, tigers, and dogs are all viviparous animals, with the female carrying the developing embryos inside their bodies until they are ready for birth.

Life Cycle of a Mosquito
The mosquito life cycle is fascinating and consists of several stages: egg, larva, pupa, and adult. Each stage plays a crucial role in the development of the mosquito.
Egg Stage
- Female mosquitoes lay eggs in or near water.
- The eggs can survive in dry conditions for several months until they come into contact with water.
Hatching Process
- Once the eggs are submerged in water, they hatch into larvae.
- This is where the answer to the question lies: the correct term for what hatches from the eggs is "larva."
Larva Stage
- The larva, also known as "wigglers," lives in the water and feeds on organic matter.
- They undergo several molts before transitioning to the next stage.
Pupa Stage
- After the larval stage, mosquitoes enter the pupal stage.
- In this stage, they do not feed but undergo metamorphosis, preparing to emerge as adults.
Adult Mosquito
- Finally, the pupae develop into adult mosquitoes, ready to fly and reproduce.
- Adult mosquitoes play a significant role in ecosystems and can be vectors for diseases.
Conclusion
In summary, when mosquito eggs hatch, they produce larvae. Understanding this life cycle is essential for controlling mosquito populations and preventing the spread of diseases they may carry. The larval stage is critical for growth and development before transitioning into the pupal stage and eventually becoming an adult mosquito.

Male Reproductive Organs in Human Beings

The male reproductive system in human beings consists of various organs that are responsible for the production, storage, and transportation of sperm. The primary male reproductive organs are the testes, which produce sperm cells and the hormone testosterone.

1. Testes
The testes are a pair of oval-shaped organs located outside the body in a sac called the scrotum. They are the primary male reproductive organs and are responsible for the production of sperm cells through a process called spermatogenesis. The testes also produce the hormone testosterone, which plays a crucial role in the development of male secondary sexual characteristics.

2. Sperms
Sperms, also known as spermatozoa, are the reproductive cells produced by the testes. They are microscopic in size and have a unique structure that enables them to swim and fertilize the female egg. Sperms are produced in large numbers and are stored in the epididymis, a coiled tube located on the back of each testicle.

3. Ova
Ova, also known as eggs, are the reproductive cells produced by the female reproductive system. They are not a part of the male reproductive system.

4. Ovaries
Ovaries are the female reproductive organs that produce ova and secrete the female sex hormones estrogen and progesterone. They are not a part of the male reproductive system.

In summary, the male reproductive organs in human beings include the testes and the sperms. The testes are responsible for the production of sperms and the hormone testosterone, while the sperms are the reproductive cells that fertilize the female egg. Ova and ovaries are part of the female reproductive system and are not present in males.

Asexual

Answer is option a because hermaphrodite means having both male and female sexual organs . in bisexual flowers there are both stamen and pistil (male and female parts respectively)

The hermaphrodite animals are those which have both male and female gametes and which can produce both internally and externally. So an example of hermaphrodite animal is earthworm which means it is both a male and female . other example is leeches which are also hermaphrodite.hope it will help.

Reproduction in Turkey and Ostrich

Turkey and ostrich are both birds that reproduce through laying eggs. Let's explore this in more detail:

Laying Eggs
- Both turkeys and ostriches are oviparous, meaning they reproduce by laying eggs.
- The female turkey or ostrich will lay eggs in a nest or on the ground, depending on the species.
- The eggs are then incubated by the female bird until they hatch.
- Once the eggs hatch, the young birds, called chicks, emerge.

Therefore, the correct answer to the question is option 'A' - Turkey and ostrich reproduce by laying eggs.

Fertilization: The Fusion Process of Sperm and Ovum
Fertilization is the process in which a sperm cell and an ovum (egg cell) fuse together to form a zygote, which eventually develops into an embryo. Here is a detailed explanation of the fertilization process:
1. Introduction:
Fertilization is a crucial step in sexual reproduction, where the genetic material from both parents combines to create a unique individual.
2. Sperm Journey:
- Sperm cells are produced in the testes and stored in the epididymis until ejaculation.
- During sexual intercourse, millions of sperm are released into the female reproductive tract through the penis.
3. Ovum Release:
- Meanwhile, the female reproductive system releases a mature egg cell from the ovary during ovulation.
- The ovum travels through the fallopian tube towards the uterus.
4. Sperm-Ovum Encounter:
- The sperm cells swim through the cervix, uterus, and into the fallopian tube.
- Only a few hundred sperm cells reach the fallopian tube and encounter the ovum.
5. Acrosome Reaction:
- The acrosome, a cap-like structure on the head of the sperm, releases enzymes to penetrate the protective layers surrounding the ovum.
6. Penetration of Ovum:
- One sperm cell successfully penetrates the outer layer of the ovum, which triggers changes that prevent other sperm cells from entering.
- The sperm then enters the ovum, and their genetic material combines.
7. Zygote Formation:
- The fusion of the sperm and ovum results in the formation of a zygote.
- The zygote contains the complete set of genetic information from both parents.
8. Cell Division and Implantation:
- The zygote undergoes rapid cell division, forming an embryo.
- The embryo travels through the fallopian tube and implants into the uterine wall, where it continues to develop.
In conclusion, fertilization is the process of fusion between a sperm cell and an ovum, leading to the formation of a zygote. This process marks the beginning of the development of a new individual in sexual reproduction.

The answer is C: endocrine glands.
Hormones are secreted by endocrine glands in the body. These glands are specialized tissues that release hormones directly into the bloodstream. The hormones then travel throughout the body to target cells where they regulate various physiological processes.
Here are some key points to explain why the answer is C:
- Endocrine glands: These glands are responsible for producing and releasing hormones into the bloodstream. They do not have ducts and their secretions are released directly into the bloodstream. Examples of endocrine glands include the pituitary gland, thyroid gland, adrenal glands, and ovaries/testes.
- Functions of hormones: Hormones act as chemical messengers that regulate various bodily functions such as growth and development, metabolism, sexual function, mood, and sleep. They help maintain homeostasis and coordinate the activities of different organs and systems in the body.
- Target cells: Once hormones are released into the bloodstream, they travel to specific target cells or tissues that have receptors for the hormone. These receptors allow the hormone to bind and initiate a cellular response. The effects of hormones can be widespread or localized, depending on the specific hormone and target cells involved.
- Exocrine glands: Exocrine glands, on the other hand, secrete their products through ducts onto a body surface or into a body cavity. Examples of exocrine glands include sweat glands, salivary glands, and mammary glands. These glands do not secrete hormones but rather substances such as sweat, saliva, and milk.
In conclusion, hormones are secreted by endocrine glands in the body. These glands release hormones into the bloodstream, which then travel to target cells to regulate various physiological processes.

The reproductive organ in flowering plants is the Flower.
Explanation:

• Flower: The flower is the reproductive organ in flowering plants. It is responsible for producing and housing the reproductive structures necessary for sexual reproduction.


• Structure: The flower typically consists of four main parts: the sepals, petals, stamens, and pistils.


• Sepals: The sepals are usually green and protect the developing flower bud.


• Petals: The petals are often brightly colored and attract pollinators, such as bees or butterflies.


• Stamens: The stamens are the male reproductive organs of the flower. Each stamen consists of a filament and an anther, which produces pollen.


• Pistils: The pistils are the female reproductive organs of the flower. Each pistil consists of an ovary, a style, and a stigma. The ovary contains ovules, which develop into seeds after fertilization.


• Pollination and Fertilization: The flower plays a crucial role in pollination, where pollen is transferred from the anther to the stigma. Once the pollen reaches the stigma, it travels down the style to the ovary, where fertilization occurs, leading to the development of seeds.

Therefore, the correct answer is Option B: Flower.

Oviduct

Answer:
External fertilization:
External fertilization is a reproductive process where the fusion of gametes (sperm and egg) occurs outside the body of the parent organisms. This process usually occurs in aquatic environments and involves the release of eggs and sperm into the surrounding water.
Organisms that reproduce by external fertilization:
Among the given options, the organisms that reproduce by external fertilization are:
- Starfish: Starfish are marine animals that reproduce externally. They release their eggs and sperm into the water, where fertilization takes place.
- Jellyfish: Jellyfish are also marine organisms that reproduce by external fertilization. They release their eggs and sperm into the water column, and fertilization occurs externally.
- Frog: Frogs, on the other hand, do not reproduce by external fertilization. They undergo internal fertilization, where the male frog transfers sperm directly into the female's body.
Therefore, the correct answer is D: all of these.

Reproductive Methods in Different Animals:
Bird:
- Birds reproduce by internal fertilization.
- Male birds transfer sperm to the female during copulation.
- The sperm fertilizes the eggs inside the female's body.
Whale:
- Whales also reproduce by internal fertilization.
- Male whales have a specialized organ, called a penis, which is used to transfer sperm into the female's reproductive tract.
- The female whale then carries the fertilized eggs inside her body until they are ready to be born.
Human:
- Humans reproduce by internal fertilization.
- During sexual intercourse, the male's penis enters the female's vagina and deposits sperm into the reproductive tract.
- The sperm then fertilizes the egg, which is located in the female's uterus.
All of these:
- All three options, bird, whale, and human, reproduce by internal fertilization.
- They all involve the transfer of sperm from the male to the female's reproductive tract for fertilization to occur.
- The fertilized eggs develop inside the female's body until they are ready to be born.
In conclusion, all of these animals, including birds, whales, and humans, reproduce through internal fertilization.

How long does it take for an embryo of a hen to develop into a chick?
The development of an embryo into a chick in a hen takes a specific amount of time. Let's break down the stages and timeframes involved:
1. Incubation:
- The process starts when a fertilized egg is incubated, either naturally by a hen or artificially in an incubator.
- During this stage, the embryo develops and grows inside the egg.
2. Duration:
- The incubation period for a hen's egg is typically around 21 days.
- This means that it takes approximately three weeks for the embryo to develop into a chick.
3. Factors affecting incubation:
- The incubation period can vary slightly depending on various factors such as the breed of the hen, environmental conditions, and egg fertility.
Therefore, the correct answer is C: three weeks. It takes approximately three weeks for an embryo of a hen to develop into a chick.

Metamorphosis: The Transformation of Larva into an Adult
Metamorphosis is the process by which a larva transforms into an adult through drastic changes. Here is a detailed explanation of this phenomenon:
1. Definition:
- Metamorphosis is a biological process in which an organism undergoes a distinct change in its body structure and physiology during development.
- It involves a series of stages and transformations leading to the development of an adult organism from a larval form.
2. Types of Metamorphosis:
- There are two main types of metamorphosis: incomplete metamorphosis and complete metamorphosis.
- In incomplete metamorphosis, the larva resembles the adult but lacks wings or other adult structures. It undergoes a series of molts until it reaches adulthood.
- In complete metamorphosis, the larva goes through a dramatic transformation, changing its body structure, behavior, and diet. It passes through distinct developmental stages such as egg, larva, pupa, and adult.
3. Examples of Metamorphosis:
- Insects such as butterflies, moths, beetles, and flies undergo complete metamorphosis.
- The larva of a butterfly, called a caterpillar, hatches from an egg and goes through multiple molts, increasing in size each time. Eventually, it forms a pupa or chrysalis, within which the larva undergoes a complete restructuring of its body tissues to form the adult butterfly.
- Frogs and other amphibians also undergo metamorphosis. The larval stage, called a tadpole, lives in water and breathes through gills. As it develops, it grows legs, loses its tail, and develops lungs to become an adult frog.
4. Importance of Metamorphosis:
- Metamorphosis is crucial for the survival and adaptation of many species.
- It allows organisms to occupy different ecological niches and exploit different resources at different stages of their life cycle.
- The transformation from larva to adult often involves changes in diet, habitat, locomotion, and reproductive organs, enabling organisms to specialize in different functions at different life stages.
In conclusion, metamorphosis is the process by which a larva undergoes dramatic changes to transform into an adult organism. It is a fascinating biological phenomenon that allows organisms to adapt to different stages of their life cycle and occupy various ecological niches.

Onset of sexual maturity in human beings is called Puberty.

Puberty is a natural and significant stage of development in human beings which marks the onset of sexual maturity. It is a period during which a child's body undergoes several physiological changes, preparing them for reproduction. This process usually occurs during adolescence.

What is Puberty?
Puberty is a complex biological process that involves various hormonal and physical changes in both boys and girls. It is triggered by the release of hormones from the pituitary gland in the brain. These hormones stimulate the development of secondary sexual characteristics and reproductive organs.

Physical Changes during Puberty:
During puberty, both boys and girls experience certain physical changes. These changes include:

1. Development of primary sexual characteristics: Girls experience the growth of breasts and the beginning of menstruation, while boys experience the growth of the testes and the production of sperm.

2. Development of secondary sexual characteristics: Girls develop wider hips, the growth of pubic and underarm hair, and the occurrence of menstruation. Boys experience the growth of facial hair, deepening of the voice, and the growth of pubic and underarm hair.

3. Growth spurt: Both boys and girls experience a rapid growth spurt during puberty. They may experience an increase in height and weight as their bodies grow.

4. Acne: Due to hormonal changes, many adolescents develop acne, which is a common skin condition characterized by pimples and blackheads.

5. Body odor: Increased sweat production and hormonal changes contribute to the development of body odor during puberty.

Emotional and Psychological Changes:
In addition to the physical changes, puberty also brings about emotional and psychological changes in adolescents. These changes may include:

1. Mood swings: Adolescents may experience frequent changes in mood and emotions.

2. Increased sexual curiosity: As they enter puberty, adolescents may develop an increased interest in sexual matters and experience curiosity about their own bodies and those of others.

3. Developing self-identity: Adolescents often go through a period of self-discovery and may question their identity, values, and beliefs.

4. Increased independence: As they mature, adolescents may seek more independence from their parents and develop their own opinions and preferences.

Overall, puberty is a crucial stage of human development that prepares individuals for adulthood and reproduction. It is a time of significant physical, emotional, and psychological changes, and it is important for adolescents to receive support and guidance during this transitional period.

Embryonic Development in Multicellular Organisms
Introduction:
Embryonic development is a complex process that involves the growth and differentiation of cells to form a fully functional organism. In multicellular organisms, this development occurs through a combination of cell division and cell differentiation.
Cell Division:
Cell division is the process by which a single cell divides into two or more daughter cells. It is a crucial part of embryonic development as it allows for the rapid increase in cell number, leading to the formation of tissues and organs. During cell division, the genetic material is duplicated and evenly distributed to ensure that each daughter cell receives a complete set of chromosomes. This process, known as mitosis, plays a vital role in the growth and development of the embryo.
Cell Differentiation:
Cell differentiation refers to the process by which cells become specialized and acquire distinct structures and functions. As the embryo develops, cells undergo specific changes in gene expression and morphology, leading to the formation of different cell types. Differentiation is controlled by various factors, including signaling molecules and transcription factors, which regulate the activation and repression of specific genes. This process is essential for the formation of different tissues and organs in the developing embryo.
Both (a) & (b):
Embryonic development in multicellular organisms occurs through a combination of cell division and cell differentiation. These processes are interconnected and mutually dependent. While cell division allows for the rapid increase in cell number, cell differentiation ensures that the cells acquire specific structures and functions necessary for the development of different tissues and organs. Therefore, the correct answer is option C - both (a) and (b).
Conclusion:
Embryonic development in multicellular organisms involves both cell division and cell differentiation. Cell division leads to the formation of new cells, while cell differentiation ensures that these cells acquire specialized structures and functions. These processes work together to shape the developing embryo and give rise to the various tissues and organs necessary for the functioning of the organism.

Flower Structure:
- The flower is the reproductive structure of a plant.
- It consists of several parts, including the stamen, pistil, sepal, and petals.
Stamen:
- The stamen is the male reproductive organ of a flower.
- It is composed of two main parts: the filament and the anther.
- The filament is a long, slender stalk that supports the anther.
- The anther contains the pollen sacs, which produce and release the male gametes, known as pollen grains.
Pistil:
- The pistil is the female reproductive organ of a flower.
- It is composed of three main parts: the stigma, style, and ovary.
- The stigma is the sticky, receptive surface at the top of the pistil.
- The style is a tube-like structure that connects the stigma to the ovary.
- The ovary contains the ovules, which develop into seeds after fertilization.
Flower Reproduction:
- In most flowers, both male and female reproductive organs are present in the same flower.
- This is known as a perfect or bisexual flower.
- The stamen produces the male gametes (pollen grains) in the anther.
- The pistil produces the egg cell (ovule) in the ovary.
Answer:
- The flower has the pistil which produces the egg cell and the stamen which produces the male gamete in the same flower.
- Therefore, the correct answer is B: pistil, stamen.

To identify which organism reproduces by budding process, let's analyze each option:
A: Hydra
- Hydra is a freshwater organism belonging to the phylum Cnidaria.
- It reproduces asexually through a process called budding, where a small outgrowth or bud forms on the body of the parent organism.
- This bud eventually separates from the parent and develops into a new individual.
B: Spirogyra
- Spirogyra is a filamentous green algae.
- It reproduces through a process called conjugation, which involves the exchange of genetic material between two adjacent filaments.
- Conjugation is not considered a budding process.
C: Sponge
- Sponges belong to the phylum Porifera.
- They reproduce sexually by releasing eggs and sperm into the water for fertilization.
- Sponges do not reproduce by budding.
D: Mushroom
- Mushrooms are part of the fungi kingdom.
- They reproduce through the release of spores, which are dispersed for reproduction.
- Mushrooms do not reproduce by budding.
Therefore, the correct answer is A: Hydra. Hydra reproduces through the process of budding, where new individuals develop as outgrowths or buds on the parent organism.

Amoeba reproduction
Amoeba reproduces through binary fission
- Binary fission is a form of asexual reproduction where a single organism divides into two identical daughter cells.
- This is the primary method of reproduction in amoebas.
- The process starts when the amoeba's nucleus divides into two identical copies.
- The cytoplasm then separates, forming two separate daughter cells.
- Each daughter cell is genetically identical to the parent cell.
- This process allows amoebas to rapidly multiply and increase their population.
Advantages of binary fission in amoebas
- Rapid reproduction: Binary fission allows amoebas to reproduce quickly, leading to the rapid growth of their population.
- Genetic stability: Since the daughter cells are genetically identical to the parent cell, there is no genetic variation introduced during reproduction.
- Adaptability: Amoebas can adapt to changing environments more easily through asexual reproduction, as they do not rely on finding a mate for sexual reproduction.
Other methods of reproduction in amoebas
- While binary fission is the primary method of reproduction in amoebas, they can also reproduce through sexual reproduction under certain conditions.
- Sexual reproduction involves the fusion of two gametes (reproductive cells) to form a new organism.
- This process introduces genetic variation and allows for the exchange of genetic material between individuals.
- However, the occurrence of sexual reproduction in amoebas is relatively rare compared to binary fission.
Conclusion
Amoebas primarily reproduce through binary fission, a form of asexual reproduction. This process allows them to quickly multiply and maintain genetic stability. While they can also reproduce sexually, it is less common.

Answer:
The natural process of giving birth to young ones of their own kind is termed as reproduction. Here is a detailed explanation of the concept:
1. Introduction:
Reproduction is a fundamental biological process through which living organisms produce offspring of their own kind.
2. Definition:
Reproduction can be defined as the process by which organisms create new individuals of the same species.
3. Types of Reproduction:
There are two main types of reproduction:
- Sexual Reproduction: Involves the fusion of male and female gametes to form a zygote, which develops into a new individual.
- Asexual Reproduction: Involves the production of offspring without the involvement of gametes. It can occur through various mechanisms such as binary fission, budding, fragmentation, etc.
4. Importance of Reproduction:
Reproduction is essential for the survival and continuation of a species. It allows for the passing on of genetic information and ensures the diversity and adaptation of populations over time.
5. Process of Reproduction:
The process of reproduction typically involves the following steps:
- Gamete Production: Male and female individuals produce specialized reproductive cells called gametes.
- Fertilization: The fusion of male and female gametes occurs, resulting in the formation of a zygote.
- Embryonic Development: The zygote undergoes development and grows into an embryo within the female reproductive system.
- Birth or Hatching: The developed embryo is expelled or hatches from the mother's body, giving birth to a new individual.
6. Examples of Reproduction:
- In humans, sexual reproduction involves the fertilization of an egg by a sperm, leading to the development of a fetus and subsequent birth.
- In plants, reproduction can occur through various means such as pollination, seed dispersal, and germination.
In conclusion, the natural process of giving birth to young ones of their own kind is termed as reproduction. It is a vital process for the survival and continuation of species, allowing for the creation of new individuals through sexual or asexual means.

Reproduction System in Flowering Plants and Humans
Both flowering plants and humans have reproductive systems that allow them to produce offspring. The specific structures and processes involved in reproduction may differ between the two, but there is one common reproductive organ that exists in both:
Ovary
- The ovary is a female reproductive organ found in both flowering plants and humans.
- In flowering plants, the ovary is part of the flower's pistil and contains the ovules, which are the structures that develop into seeds after fertilization.
- In humans, the ovary is part of the female reproductive system and plays a crucial role in the production of eggs or ova.
- The ovary releases mature eggs during the menstrual cycle, which can be fertilized by sperm to initiate pregnancy.
Other reproductive structures that are specific to each organism include:
In Flowering Plants:
- Anther: The anther is the part of the flower's stamen that produces and releases pollen, which contains the plant's male gametes or sperm.
- Style: The style is the elongated portion of the pistil that connects the ovary to the stigma. It provides a pathway for pollen to reach the ovary for fertilization.
In Humans:
- Sperm Ducts: In males, the sperm ducts, also known as the vas deferens, are responsible for transporting sperm from the testes to the urethra.
- Uterus: The uterus is a muscular organ in the female reproductive system where a fertilized egg implants and develops into a fetus during pregnancy.
In conclusion, while the specific reproductive structures and processes may differ between flowering plants and humans, the ovary is a common reproductive organ found in both, playing a crucial role in the production of eggs and seeds.

Binary fission is a method of asexual reproduction in which an organism divides into two equal parts, each of which becomes a new individual. Among the given options, the organism that reproduces by binary fission is the Amoeba.
Explanation:
Amoeba:
- Amoebas are single-celled organisms that belong to the phylum Protozoa.
- They reproduce asexually by binary fission, a process in which the nucleus divides into two, followed by the division of the cytoplasm, resulting in the formation of two identical daughter cells.
- Each daughter cell then grows and develops into an independent Amoeba.
Hydra:
- Hydras are multicellular organisms belonging to the phylum Cnidaria.
- They reproduce asexually by a process called budding, where a small outgrowth or bud develops on the parent organism and eventually detaches to form a new individual.
Yeast:
- Yeasts are single-celled fungi that reproduce both sexually and asexually.
- They primarily reproduce by budding, where a small outgrowth or bud develops on the parent cell, which then grows and detaches to form a new individual.
Sea anemone:
- Sea anemones are multicellular organisms belonging to the phylum Cnidaria.
- They reproduce both sexually and asexually.
- Asexual reproduction in sea anemones can occur through a process called pedal laceration, where a part of the foot of the anemone breaks off and develops into a new individual.
Therefore, the organism that reproduces by binary fission among the given options is the Amoeba.

Because hydra reproduce by the process of budding. Budding is a process in which the offspring grows out of the parent's body.

Because some animals lays egg whereas some give birth to babies

(1) Viviparous. (2) Oviparous



Viviparous - give birth to babies
Oviparous- gave birth to babies threw lay eggs
they both were depend on reproduction type or another.




I hope this will help to you.
if no so I am sorry ...

Answer:-(A) Both girls and boys become sexually mature and are ready to reproduce.The average age for girls to begin puberty is 11, while for boys the average age is 12.