Extra Question Chapter 1:Chemical Reaction And Equations
Extra Question II Chapter 1:Chemical Reaction And Equations
Extra Question Chapter 2:Acid Ans Base
Important Question Chapter 3:Metal and Non Metal
Chapter 4:Carbon And Its Compoundl
Chapter 5:Periodic Classification of elememt
Chapter 7:Control and coordination
Chapter 8:How Do Organisms Reproduce?
Chapter 9:Hearedity And Evolution
Chapter 10:Light Reflection and Refraction
Chapter 11:The Human Eye and Colorful World
Reproduction is a biological process in which new individuals of the same species are produced by one parent (asexual reproduction) or both parents (sexual reproduction). Asexual reproduction: This is where single parents produce offspring without the involvement of gametes (sex cells). Children born are like their parents. Examples include binary fission in bacteria and budding in yeast. Sexual reproduction: This applies to parents of the opposite sex. They produce gametes that combine to form a new person. Offspring are genetically different from their parents. Examples are humans, animals, and plants.
Regeneration is an asexual reproduction in which an organism can reproduce or regrow its lost body parts. This method is common in starfish, hydra and other creatures
Binary fission is a method of asexual reproduction in which a parent organism divides into two equal parts, each becoming a new organism. Amoeba and bacteria reproduce by this method.
Budding is a type of asexual reproduction where a new organism develops as a small bulb-like projection called bud on the body of the parent organism. This bud grows and detaches from the parent to live independently. Yeast and Hydra reproduce by budding.
A clone is an organism or cell, or group of organisms or cells, produced asexually from one ancestor to which they are genetically identical
Vegetative propagation is a type of asexual reproduction in plants where new plants are produced from roots, stems, leaves, and buds. Examples include reproduction through stem in potato, through leaf in Bryophyllum, and through roots in sweet potato..
DNA copying is important in reproduction as it helps in the transmission of characters or traits from parents to offspring. It ensures the continuity of life by producing variations which are essential for the process of evolution.
Sexual reproduction is the process involving the fusion of male and female gametes. In flowering plants, the male gamete is found in the pollen grain (produced in anther), and the female gamete is found in the ovule (contained in the ovary). The transfer of pollen from anther to the stigma is called pollination. The fusion of male and female gametes is called fertilization, resulting in the formation of seeds.
Pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same or another flower. It can be self-pollination (within the same flower) or cross-pollination (between two different flowers).
The testes in the human male reproductive system are responsible for the production of male gametes or sperm cells. They also produce the hormone testosterone, which is responsible for the development of secondary sexual characteristics in males.
The menstrual cycle is a monthly cycle in females which prepares the uterus for pregnancy. It involves the maturation of the egg, its release (ovulation), preparation of the uterus for implantation. If fertilization does not occur, the lining of the uterus sheds off, causing menstruation.
Fertilization is the process of fusion of the male and female gametes resulting in the formation of a zygote. This zygote develops into a new individual.
The placenta is a temporary organ that connects the developing fetus via the umbilical cord to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother's blood supply. It produces hormones that are necessary for pregnancy, such as progesterone and estrogen, which maintain the lining of the uterus and stimulate the development of mammary glands, respectively. The placenta also serves as a barrier to most harmful substances, protecting the fetus, although it's not entirely impermeable and some substances such as alcohol, drugs, and certain diseases can cross this barrier and harm the fetus.
STDs are infectious diseases that spread from person to person through sexual contact. They are caused by bacteria, viruses, or parasites that can lead to severe health problems if left untreated. Examples include HIV/AIDS, syphilis, gonorrhea, and herpes. It's important to practice safe sex and get regular check-ups to prevent these diseases
Reproduction is vital for organisms as it ensures the continuation of a species or a generation. It results in offspring that are genetically similar to the parents. Reproduction also leads to variations in species which are necessary for evolution and adaptation to changing environments.
Contraception methods are used to prevent pregnancy. They include barrier methods (like condoms and diaphragms), hormonal methods (like birth control pills and patches), intrauterine devices (IUDs), emergency contraceptives, and permanent methods like sterilization. Each method works differently and the choice depends on an individual's health, frequency of sexual activity, number of sexual partners, and desire to have children in the future. .
In humans, fertilization begins when a sperm penetrates an egg. This happens in the fallopian tubes, after ovulation. Once a sperm has penetrated the egg, the chromosomes from both parents combine, resulting in a zygote. This zygote then begins to divide, forming an embryo which moves down to the uterus and implants itself in the uterine wall, marking the beginning of pregnancy
Variation is beneficial for species as it contributes to the survival and evolution of a species. It allows organisms to adapt to changes in their environment and provides a basis for natural selection, where individuals with advantageous traits are more likely to survive and reproduce. This leads to the evolution of species over time.
The ovary is an organ of the female reproductive system that produces eggs (ovum). Each month, during the menstrual cycle, an egg is released from the ovary in a process called ovulation. The ovaries are also responsible for producing the female sex hormones, estrogen, and progesterone, which regulate the menstrual cycle and pregnancy
Asexual reproduction involves only one parent and the offspring are genetically identical to the parent. It does not involve the fusion of gametes. Examples include binary fission in bacteria, budding in hydra. In contrast, sexual reproduction involves two parents and the offspring are genetically different from the parents. It involves the fusion of male and female gametes. Examples include humans, animals, and most plants.