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Earthworms are hermaphrodite and reprodu...

Earthworms are hermaphrodite and reproduce primarily by

A

Self-fertilisation

B

Cross-fertilisation

C

Asexually

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
B
Self-fertilization is not allowed due to protandrous (Testes maturing earlier than ovaries) condition in earthworm.
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MODERN PUBLICATION-STRUCTURAL ORGANISATION IN ANIMALS-COMPETITION FILE (OBJECTIVE TYPE QUESTIONS) (MULTIPLE CHOICE QUESTIONS)
  1. Tendons and ligaments are specialized types of

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  2. Compound eyes are found in

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  3. Earthworms are hermaphrodite and reproduce primarily by

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  4. The process of increasing fertility of soil by the earthworms is calle...

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  5. In Earthworms setae are present in all segments except

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  6. In the diagram of the reproductive system of earthworm A, B, C, D and ...

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  7. About how many times does the nymph of the Periplaneta americana under...

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  8. Fibroblasts, macrophages and mast cells are seen in

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  9. Read the statements with regard to frog. Which of the statement(s) is/...

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  10. Stratified epithelium is found in :

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  11. Pheretima and its close relatives derive nourishment from

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  12. Compared to those of humans, the erythrocytes in frog are

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  13. Select the correct statement from the ones given below with respect to...

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  14. What is common between earthworm and Periplaneta?

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  15. The ingrowth of exoskeleton in the head of cockroach is called

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  16. Which of the following is absent in the coelomic fluid of earthworm ?

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  17. Myoglobin is present in

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  18. A polysaccharide constituent found in the matrix of cartilage is:

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  19. In which segment in earthworm, the ovary is present?

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  20. Blood-brain barrier is formed by

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