MCQ
Mostly hermaphrodite animals are present in
- ACoelenterata
- BNematoda
- CAnnelida
- ✓Platyhelminthes
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($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.
($ii$) Thin branching tubes carry oxygen from the air to all the parts.
($iii$) The opening of the spiracles is regulated by sphincters.
($iv$) Exchange of gases take place at the tracheoles by diffusion.
|
Components |
$%$ of the total cellular mass |
|
$A$. Water |
$1.\ 10-15$ |
|
$B$. Proteins |
$2.\ 70-90$ |
|
$C$. Carbohydrates |
$3.\ 5-7$ |
|
$D$. Lipids |
$4.\ 3$ |
|
$E$. Nucleic acids |
$5.\ 2$ |
|
$F$. lons |
$6.\ 1$ |
$A - B - C - D - E - F$