G. Answer the following questions in brief.
1. Define reproduction. Write its significance.
2. Write the full form of IVF.
3. How is the zygote formed in humans? Where is it formed? What does it develop
into?
4. Millions of gametes are produced in species that exhibit external fertilisation. Give
reason.
5. Where does the embryo get implanted in the human body?
6. What are hermaphrodites?
7. What is the role of penis in a human male reproductive system?
Answers
Answer:
मनुष्य वनस्पति एवं वन्य जीवों का उपयोग करता है। भारत में पादपों एवं जीवों के वितरण को निर्धारित करने वाले तत्त्व इस प्रकार हैं-जलवायु, मृदा, उच्चावच, अपवाह, तापमान, सूर्य का प्रकाश, वर्षण (UPBoardSolutions.com) आदि।
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Explanation:
1. Reproduction is the biological process by which existing organisms give rise to their offspring. Every existing plant, animal or other living organism is the result of biological reproduction. Reproduction maintains the thread of life. ... Reproduction is important for the survival of all living things.
2. In vitro fertilization (IVF)
3. When a female's ovum and a male's sperm cell join, the cell that results is called the zygote. The zygote then multiplies, and grows into an embryo. So, a zygote is formed from the union of two gametes, and is the first stage in a human organism's development
4. Organisms that take part in such process produce large number of gametes because (i) In external fertilization, there is a great chance that the sperm and the eggs released by the organisms can be affected by factors present in the environment like dessication ,predators, etc.
5. If one of the sperm cells penetrates the egg, the egg is fertilized and begins developing. The egg takes several days to travel down the fallopian tube into the uterus. After it is in the uterus, a fertilized egg usually attaches to (implants in) the lining of the uterus (endometrium).
6. In reproductive biology, a hermaphrodite is an organism that has complete or partial reproductive organs and produces gametes normally associated with both male and female sexes. Many taxonomic groups of animals do not have separate sexes.
7. The external parts of the male reproductive system include the penis, the scrotum and the testicles. The penis is the male organ for sexual intercourse