How do Organisms Reproduce?
- What could be the reasons for adopting contraceptive methods? Contraceptive methods are mainly adopted because of the following reasons: To prevent unwanted pregnancies. To control population rise or bi... 1
- How does reproduction help in providing stability to populations of species? Reproduction is the process of producing new individuals of the same species by existing organisms of a species, so, it helps in providing s... 1
- How are the modes for reproduction different in unicellular and multicellular organisms? In unicellular organisms, reproduction occurs by the division of the entire cell. The modes of reproduction in unicellular organisms can be... 1
- What are the different methods of contraception? The contraceptive methods can be broadly divided into the following types: Natural method: It involves avoiding the chances of meeting of sp... 1
- Draw a labelled diagram of the longitudinal section of a flower. Read the text in diagram :: 1
- Why does menstruation occur? Menstruation is a process in which blood and mucous flows out every month through the vagina. This process occurs every month because one eg... 1
- What are the functions performed by the testis in human beings? Functions of testes: Produce sperms, which contain haploid set of chromosomes of father. Produce a hormone called testosterone, which brings... 1
- What are the advantages of sexual reproduction over asexual reproduction? Advantages of sexual reproduction: In sexual reproduction, more variations are produced. Thus, it ensures survival of species in a populatio... 1
- The anther contains (a) sepals. (b) ovules. (c) carpel. (d) pollen grains. Correct option is d) pollen grains. The anther contains pollen grains. 1
- Which of the following is not a part of the female reproductive system in human beings ? Correct option is c) Vas deferens Vas deferens is not a part of the female reproductive system in human beings . 1
- Asexual reproduction takes place through budding in (a) amoeba. (b) yeast. (c) plasmodium. (d) leishmania. Correct option is b) yeast Asexual reproduction takes place through budding in yeast 1
- If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases? No, because copper-T will not prevent contact body fluids. Thus it will not protect her from sexually transmitted diseases. 1
- How does the embryo get nourishment inside the mother's body? After fertilization the lining of uterus thickens and is richly supplied with blood to nourish the growing embryo. The embryo gets nutrition... 1
- What are the changes seen in girls at the time of puberty? The changes seen in girls at the time of puberty are: Increase in breast size and darkening of skin of the nipples present at the tips of th... 1
- What is the role of the seminal vesicles and the prostate gland? The secretions from seminal vesicles and prostate glands lubricate the sperms and provide a fluid medium for easy transport of sperms. Their... 1
- How is the process of pollination different from fertilization? Pollination is the process of transfer of pollens from anther to stigma. It occurs with the help of certain pollinators such as air, water,... 1
- Why is DNA copying an essential part of the process of reproduction? DNA copying is an essential part of reproduction as it passes genetic information from parents to offspring. It determines the body design o... 1
- Why is vegetative propagation practised for growing some types of plants? Vegetative propagation is practiced for growing some types of plants because of following advantages: It is used to grow a plant in which vi... 1
- Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration? Higher complex organisms cannot give rise to new individuals through regeneration because complex organisms have organ-system level of organ... 1
- How will an organism be benefited if it reproduces through spores? Advantages of spore formation: Large numbers of spores are produced in one sporangium. Spores are distributed easily by air to far-off place... 1
- How does binary fission differ from multiple fission? In binary fission a single cell divides into two equal halves.Amoeba and Bacteria divide by binary fission. In multiple fission, a single ce... 1
- Why is variation beneficial to the species but not necessarily for the individual? Variations are beneficial to the species than individual because sometimes for a species, the environmental conditions change so drastically... 1
- What is the importance of DNA copying in reproduction? DNA is the genetic material present in the cells of all organisms. The genetic information from generation to generation is carried by DNA.... 1