How do Organisms Reproduce?: Class 10 Science Q&A · Page 6
112 free answers on How do Organisms Reproduce? (Science) for Class 10 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 10CBSE
Which of the following is not a part of the female reproductive system in human beings? (a) Ovary (b) Uterus (c) Vas deferens (d) Fallopian tube
Solution: (c) Vas deferens Vas deferens is a part of the male reproductive system. It is a long, muscular tube travelling from the epididymis into the pelvic cavity. It is behind the bladder. Its function is to transport the mature sperm to the urethra. It also carries urine to the outside of the body.
- ScienceClass 10CBSE
Asexual reproduction takes place through budding in (a) Amoeba (b) Yeast (c) Plasmodium (d) Leishmania
Solution: (b) Yeast Yeast is an example for asexual reproduction taking place through budding. A small protuberance is produced on the parent cell that grows in full size forming a bud. In the parent cell, the daughter nucleus splits and migrates to the daughter cell. By forming a constriction, the bud detaches from the mother’s body at the base. This process of budding continues to form a chain of bud cells. The mother cell is smaller than the daughter
- ScienceClass 10CBSE
If a woman is using a Copper-T, will it help in protecting her from sexually transmitted diseases?
Solution: No, the usage of copper-T cannot stop the contact of body fluids. Hence, it cannot protect her from getting sexually transmitted diseases.
- ScienceClass 10CBSE
How does the embryo get nourishment inside the mother’s body?
Solution: The lining of the uterus thickens after fertilization. The blood flow is good so as to nourish the growing embryo. Placenta is a special tissue which is embedded in the uterine wall and helps the embryo get the nourishment from the mother’s tissue. Placenta has villi on the embryo side and blood space on the mother’s side. This spacing provides a large area between the mother and the embryo and also for waste removal.
- ScienceClass 10CBSE
What are the changes seen in girls at the time of puberty?
Solution: Following are the changes seen in girls at the time of puberty: Hair growth appears in genital area. Hair growth in other areas like underarms, face, hands and legs. The size of uterus and ovary increases. The size of the breast increases followed by darkening of the nipple skin that is present at the tip of the breast. Beginning of menstrual cycle. Appearance of pimples, as there is more oil s
- ScienceClass 10CBSE
What is the role of the seminal vesicles and the prostate gland?
Solution: Lubrication of sperms and providing of a fluid medium for the easy transportation of sperms takes place with the help of secretions from the seminal vesicles and the prostate gland. These secretions also provide nutrients in the form of fructose, calcium and some enzymes.
- ScienceClass 10CBSE
Why is DNA copying an essential part of the process of reproduction?
Solution: DNA copying is an essential part of the process of reproduction because it carries the genetic information from the parents to offspring. A copy of DNA is produced through some chemical reactions resulting in two copies of DNA. Along with the additional cellular structure, DNA copying also takes place, which is then followed by cell division into two cells.
- ScienceClass 10CBSE
Why is vegetative propagation practised for growing some types of plants?
Following are the advantages of practising vegetative propagation for growing some types of plants: Crops like orange, banana, pineapple do not have viable seeds, so vegetative propagation can be used. It is a rapid, cheap and easier method to grow crops. It can be used in places where seed germination fails. A good quality of variety can be preserved.
- ScienceClass 10CBSE
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Solution: Organisms at higher complex levels cannot give rise to new individuals through regeneration because they have organization of their organs system at different levels. All these organ systems are interconnected and work in full coordination. They can regenerate a few of their lost body parts like skin, blood, muscles, etc. but can’t give rise to new individuals.
- ScienceClass 10CBSE
How will an organism be benefited if it reproduces through spores?
Solution: Following are the ways through which an organism will be benefited if it reproduces through spores: Number of spores produced in one sporangium would be large. In order to avoid competition at one place, spores can be distributed to faraway places with the help of air. In order to prevent dehydration under unfavorable conditions, the spores are covered by thick walls.
- ScienceClass 10CBSE
How does binary fission differ from multiple fission?
Solution: When a single cell divides into two equal halves, it is known as binary fission. Bacteria and amoeba are examples of binary fission. When a single cell divides into multiple daughter cells at the same time, it is known as multiple fission. Algae and sporozoans are examples of multiple fission.
- ScienceClass 10CBSE
Why is the variation beneficial to the species but not necessarily for the individual?
Solution: The reason why the variation is beneficial to the species rather than individuals is because sometimes the climatic changes have a drastic effect on the species, which makes their survival difficult. For examples, if the temperature of the water body increases, there might be certain species of microorganisms which might die. This may result in disturbance in the environment. So, variation is beneficial to species and not for the individuals.