Name the animal, the cockroach, the earthworm or the frog, for each description…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the animal, the cockroach, the earthworm or the frog, for each description. This part goes beyond the NEET syllabus text, but it is in the boards, A-Level and IB.
- An animal with a three-chambered heart and red blood cells that have a nucleus.
- An animal that breathes through its moist skin and has nephridia for excretion.
- An animal whose blood system is open and whose blood has no oxygen carrier.
- An animal whose eggs are fertilised outside the body, and whose young is a tadpole.
- An animal that is hermaphrodite.
Need a reminder? The key ideaShow
The cockroach has separate sexes. The male has a pair of testes, vasa deferentia, a seminal vesicle and an ejaculatory duct. The sperms are packed in bundles called spermatophores. The female has a pair of ovaries, each with eight ovarioles, a genital chamber and a pair of spermathecae. The fertilised eggs are enclosed in capsules called oothecae. A female produces about nine to ten oothecae, each with about fourteen to sixteen eggs. The young nymph resembles the adult and grows by moulting about thirteen times. The earthworm is hermaphrodite with a closed blood system and breathes through its moist skin. The frog has a three-chambered heart, breathes through skin, mouth and lungs, and fertilises its eggs outside the body.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The frog.
Step 2. (b) The earthworm.
Step 3. (c) The cockroach.
Step 4. (d) The frog.
Step 5. (e) The earthworm.
Answer: (a) frog; (b) earthworm; (c) cockroach; (d) frog; (e) earthworm.
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