MCQ
Which one is a true fish?
- AJellyfish.
- BStarfish.
- CDogfish.
- DSilverfish.
Explanation:
Jellyfish or jellies are approximately cylindrical vase shaped individuals of phylum-Cnidaria. These are free swimming marine animals consisting of a gelatinous umbrella shaped bell (pulsate for locomotion) and tentacles (to capture prey). Starfish are star shaped echinoderms. These are marine invertebrates which have a central disc and five arms, (tube feet for locomotion) Scoliodon (dog fish) belongs to the class-Chondricythes, i.e., pisces. These fishes are known as dog fish due to their, ability to smell. Lepismasacharina commonly known as silver fish is small wingless insect belongs to phylum- Arthropoda.
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Of the following components of phloem is non-living:
The density of water is 1000kg/m3 and the density of copper is 8900kg/m3. Which of the following statements is incorrect?
$=\frac{\text{The density of a certain volume of copper}}{\text{The density of the same volume of water}}=8.9$
$=\frac{\text{The volume of a certain mass of copper}}{\text{The volume of the same mass of water}}=8.9$
$=\frac{\text{The weight of a certain volume of copper}}{\text{The weight of the same volume of water}}=8.9$
$=\frac{\text{The mass of a certain volume of copper}}{\text{The mass of the same volume of water}}=8.9$