Zygote: The Fertilised Egg Cell
The initial stage following the fusion of a male gamete (sperm) and a female gamete (egg) results in a single, fertilised cell. This first diploid cell marks the beginning of a new organism's development.
Defining Key Developmental Terms
Let's clarify the terms provided:
- Zygote: The immediate product of fertilization; a single-celled, fertilised egg.
- Embryo: A stage following the zygote, characterised by rapid cell division (cleavage) and differentiation, forming multiple cells and tissues.
- Foetus: A later developmental stage, typically after the embryonic period, where the organism has a more recognisably developed form.
- Blastocyst: An early-stage embryo consisting of about 100-200 cells, forming a hollow ball before implantation.
Identifying the Correct Term
The question specifically asks for the name of a "single-celled fertilised egg". Based on the definitions:
- The zygote perfectly matches the description of a single-celled fertilised egg.
- Embryo, foetus, and blastocyst represent later, multicellular stages of development.
Therefore, the correct term is zygote.
Similar Questions
- The energy currency of the cell is called as :
- Which is the outermost covering of the cell that separates the contents of the cell from its external environment?
- Cytoplasm is a jelly-like fluid that is present between:
- A jelly-like substance between the nucleus and the cell membrane is called:
- Which of the following is a membrane-bound sac filled with digestive enzymes?
- Who coined the term 'protoplasm'?
- Diffusion is a process by which:
_____________ are known as the powerhouse of the cell.
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What is the main characteristic of cells in the meristematic phase of growth in plants?
Important Questions from Cell
Which of the following is an epithelial tissue?
I. Squamous
II. Ciliated
Cells of ______ and ______ tissues are living cells.
The process of converting ammonia into nitrates is called:
Which of the following is not true about prokaryotic cells?
Fore limbs of whale, bat, tiger and man are examples of
