Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration? How does the female gamete move from the ovary to the uterus? They can regenerate their lost body parts such as skin, muscles, blood, etc. With the regression of the corpus luteum, the production of estrogen and progesterone ceases. During this period, the female secretes pheromones odoriferous substances that attract the male of the species from the skin and mucosae. What are the common contraindications of contraceptive pills? The menstrual cycle is the periodic succession of interactions between the hormones and organs of the female reproductive system that, after the beginning of puberty, regulates the release of female gametes and prepares the uterus for fertilization and pregnancy. Do you know any other plant that bears unisexual flowers? What are the phases of the menstrual cycle? This process occurs every month because one egg is released from the ovary every month and at the same time, the uterus womb prepares itself to receive the fertilized egg. Reproduction is one of the main functions of organisms and a vital part of any group of beings.
Which of the following is not an associated change during the antepartum period? Which of these is not considered a T. Analyse the reasons for failure of fruit formation in rose. Differentiate between a zoospore and a zygote. However, all variations are not necessarily beneficial for the individual organisms. What is the function of the secretions of the prostate, seminal vesicle and bulbourethral glands in reproduction? Both these plants — rose and tomato — both selected by human beings for different characteristics, the rose for its flower and tomato for its fruit. The meiosis that forms female gametes begins in the cells of ovarian follicles before birth.
What is the menstrual cycle? Some research has attempted to relate the medical ingestion of estrogen and progesterone with an increased propensity for cardiovascular diseases such as heart attacks, strokes and thrombosis and malignant neoplasms cancers. Ovulation occurs during which of the following phases? In viviparous animals, the young one develops inside the body of the female organism. In bees, the drone the single male bee is haploid and born via parthenogenesis while the females queen and workers are diploid. Offspring formed due to sexual reproduction have better chances of survival because: i In sexual reproduction, the offspring may be hybrid vigour which may adapt better with the environment. The immature egg cell still an oocyte falls into the abdominal cavity and is picked up by the Fallopian tube uterine tube, or oviduct , a tubular structure that connects the ovary with the uterus. Although this is not a rule, to be effective, fertilization must occur within 24 hours after ovulation which occurs around the 14th day of the menstrual cycle.
Analyse the reasons for it. What organs are a part of the male genital system? The female gamete released by the ovary falls into the surrounding abdominal cavity and is collected by the Fallopian tube. So, the young ones are not effectively protected and nourished and are vulnerable to predators. What is the name of one of a number of alternative forms of the same gene or genetic locus? As the formation of these vegetative propagules does not involve both the parents, the process involved is asexual. Both the angiosperm egg and human egg are stationary iii. After passing the epididymis, through which structures do sperm cells travel until exteriorization? On the other hand a tomato plant produces plenty of fruits though they have small flowers. .
Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals? The other extremity of each Fallopian tube ends in fimbria, forming fringes in the abdominal cavity. Which of the following is not a part of the female reproductive system in human beings? Which of the following develops into the ejaculatory duct and ductus deferens? To be more effective, the diaphragm needs to be used with spermicide. These secretions, along with sperm cells from the testicles, form semen. How does the embryo get nourishment inside the mother's body? Which of the following is not a germ layer during the 3 rd week of development? A pistillate flower has only carpel and no stamens. These contain small doses of hormones that prevent the release of eggs and thus fertilization cannot occur. The endocrine glands that secrete hormones involved in the menstrual cycle are the hypophysis the pituitary gland and the ovaries. In males, sexual activity is regulated by the endocrine glands: the hypophysis the pituitary , the adrenal glands and the gonads testicles.
The lateral walls of the uterine fundus communicate with the Fallopian tubes. For difference, Refer to Basic Concepts Point 2. Similarly, fallopian tubes of the female can be blocked so that the egg will not reach the uterus known as tubectomy. Asexual reproduction takes place through budding in a amoeba. In vasectomy, the vas deferens inside the scrotum are sectioned and closed at a section, forbidding the sperm cells from entering the ejaculatory duct but still allowing the release of seminal fluid during ejaculation. Zoospore: i These are endogenously asexually produced unicellular, naked and motile spores having one or two flagella.
There are medical reports associating the use of contraceptive pills with vomiting, nausea, vertigo, headaches, hypertension and other pathological conditions. Which of the following develops into: bone, connective tissue, blood, and the spleen? Draw a labelled diagram of the longitudinal section of a flower. What are the most common methods of male and female surgical sterilization? Describe the types of asexual reproduction exhibited by unicellular organisms. Barriers are available for both males and females. It includes the blocking of vas deferens to prevent the transfer of sperms known as vasectomy.
The normal duration of the menstrual cycle is 28 days, but it can vary among different women or different cycles in the same woman. Sexual reproduction does not always require two individuals ii. Progeny from asexual reproduction: i The progenies have similar genetic make up. After that, they receive secretions from seminal vesicles and gather from the right and left sides in the ejaculatory duct. Transfer of genetic material takes place iii.
The modes of reproduction in unicellular organisms can be fission, budding, etc. The organs that comprise the male genital system are the testicles, the epididymis, the vas deferens, the seminal vesicles, the ejaculatory duct, the prostate, the bulbourethral glands, the urethra and the penis. So, they are at greater risk as compared to the offsprings of the viviparous animals. In multiple fission, a single cell divides into many daughter cells simultaneously. Answers to Multiple Choice Questions 1-c 2-a 3-c 4-b 5-d 6-c 7-b 8-a 9-b 10-b 11-c 12-b 13-c 14-c 15-d 16-b 17-b 18-a. Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers.
What could be the reasons for adopting contraceptive methods? The blood concentration of these adenohypophyseal hormones falls to basal levels once again. Reduction division takes place iv. Menses is the endometrial hemorrhage excreted through the vaginal canal. There are various ways in which it happens and we have questions about each and every one of them. Sexual reproduction may noc always show better chances of survival because the offspring may be inferior to the parents. Examples: i Adventitious buds in the notches along the leaf margins of Bryophyllum grow to form new plants. Generally, how does a male animal realize that the female is receptive to copulation? Therefore, they can reproduce by complex reproductive methods such as vegetative propagation, spore formation, etc.