MCQ
How many heart does an earthworm possess?
- A6 pairs
- B5 pairs
- C2 pairs
- D1 pair
Explanation:
Earthworm does not have a true heart as it is an invertebrate, but they have five pairs of aortic arches that are referred to as the heart.
These arches are present in the anterior region of the body and they connect ventral and dorsal vessels and pump blood throughout the body.
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$(i)$ Genus comprises a group of related species which has more characters in common in comparison to species of other genera.
$(ii)$ Three different genera such as Solanum, Datura and Petunia are placed in the family malvaceae.
$(iii)$ In case of plants, classes with a few similar characters are assigned to a higher category called phylum.