Science – How do Organism Reproduce?
Very Short Answer Type Questions
Q.1) How does binary fission differ from multiple fission?
Ans) In binary fission, a single cell divides into two equal halves. Amoeba and bacteria divide by binary fission. In multiple fission, a single cell divides into many daughter cells simultaneously. Example-Plasmodium.
Q.2) Name the various types of asexual reproduction.
Ans) Various types of asexual reproduction are Fission, Budding, Spore formation, Fragmentation, Regeneration, Tissue culture.
Q.3) If a woman is using Copper-T, will it help in protecting her from sexually transmitted diseases?
Ans) No, Copper-T will not protect the woman from sexually transmitted diseases. It is a method of birth control in which sperms are killed but it does not kill STD causing microbes.
Q.4) Define grafting.
Ans) In grafting, one part of plant is inserted into another plant in a way that both of them will unite and grow together as a single plant.
Q.5) What is cross pollination or allogamy?
Ans) It is the process of transfer of pollen grains from the anther of a flower to stigma of another flower, of same or different plant, of the same or closely-related species.
Q.6) What happens if fallopian tube is blocked?
Ans) If Fallopian tube is blocked, the egg will not be able to reach the uterus. In such a case, fertilization will not take place.
Q.7) Why are testes in male located outside the abdominal cavity?
Ans) The formation of germ cells or sperms takes place in the testes. These are located outside the abdominal cavity in scrotum because sperm formation requires a lower temperature than the normal body temperature.
Q.8) What is the role of seminal vesicles and the prostate gland?
Ans) The secretions from seminal vesicles and prostate glands lubricate the sperms and provide a fluid medium focium and port of sperms. Their secretion also provides nutrients in the form of fructose, calcium and some enzymes.
Q.9) What is pollination?
Ans) “The process by which plant pollen is transferred from the male reproductive organs form seeds, is called pollination.”
Q.10) Define the unisexual flower.
Ans) The unisexual flower – “The flower which has only one sexual part i.e. either androecium (male part) or gynoecium (female part), is called unisexual flower.”
Q.11) What is regeneration?
Ans) Regeneration – The ability of organism to reproduce the lost part of the body is called regeneration” or “a complicated process in which damaged or broken piece regenerate, is called regeneration.”
Q.12) Write the definition of tissue culture.
Ans) Tissue culture is the growth of tissues or cell is an artificial medium separated from the parent organism, this mode is called tissue culture.
Q.13) What is menstruation and how many days usually lasts in menstruation?
Ans) When egg is not fertilised the lining of uterus breaks and comes out through the vagina in the form of blood and mucus, this cycle takes place roughly every month and is known as mestruation it’s period between 2 to 8 days, but it will usually last for 5 days.
Q.14) Write the name of modes of reproduction used by single cell organism. (Any two)
Ans) (1) Binary fission, (2) Budding.
Q.15) Write the name of any two parts of male reproductive system in human.
Ans) (1) Testes, (2) Penis.