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प्रश्न
How does a single called fertilized egg grows into an adult human body?
उत्तर
Fertilized egg i.e., the zygote divides and redivides and forms a ball of cells. This is a kind of embryo and it reaches the uterus and gets attached to the wall of the uterus. This fixing of embryo to the uterus is called implantation. Now the embryo undergoes a process “specialisation of cells’’. It leads to the formation of different parts of the body. This process is called differentiation. It leads to the formation of various tissues and other organs and thus organ systems are formed. The organ system leads to the formation of an individual. Thus the zygote forms an embryo, it forms a baby and it forms an adult.
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संबंधित प्रश्न
Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.
Fill in the following blank with suitable word :
The cells involved in sexual reproduction are called .............
Define the term Puberty.
In the sexual mode of reproduction, greater diversities are generated.
Name an organism where cell division is itself a mode of reproduction.
Give reason for the following:
Some organisms like honey bees are called parthenogenetic animals
Match column -1 with column - II and select the correct option.
| Column - I | Column - II | ||
| 1. | Seminal vesicles | a. | Membranous urethra |
| 2. | Scrotum | b. | Thermoregulatory |
| 3. | Tunica vaginalis | c. | Fibro muscular pouches |
| 4. | Cowper's gland | d. | Peritoneal covering |
______ fertilisation takes place in frogs and fish.
The zygote divides repeatedly into a group of cells, which develops into different tissues and organs constituting a full body. This structure is known as ______.
Justify the statement ‘Vegetative reproduction is also a type of asexual reproduction’.
