Selina solutions

Selina solutions

Grade 8

Reproduction in Humans | Short Answer Questions (SA)

Question 1

Q1) Distinguish between the following pair of terms:

(a) Egg and sperms

(b) Sexual Reproduction and asexual reproduction

(c) Budding and Regeneration

Solution:

(a) Egg and Sperm

Sperm Egg
Sperm is capable of performing locomotion. Egg is stationary.
Sperm has a special locomotory organ, the tail. Egg has no locomotory organ.
Sperm is small and made up of head, middle piece and a tail. Egg is large due to the yolk present in it.

(b) Sexual reproduction and asexual reproduction

Sexual reproduction Asexual Reproduction
In this type of reproduction male and female gametes are involved and fertilised In this type of reproduction male and female gametes are not involved
Two organisms or parents are involved to produce an organism A single parent divides itself to two or more number of daughter cells
This type of reproduction can be seen in a higher level of organisms This type of reproduction can be seen in the lower level of organisms
E.g: Humans E.g: Amoeba

(c) Budding and Regeneration

Regeneration Budding
Small broken parts or cut of the body of the organism grows or regenerate into separate individuals. In budding small parts of the body of the parent grows out as a bud which then detaches and becomes a new organism.
Lizards cast off their tails to escape predators & then regenerate them Hydra reproduces by budding using the regenerative cells. A bud develops as an outgrowth in Hydra due to repeated cell division at one specific site.
Planaria can be cut into any number of pieces and each piece grows into a complete organism. When Fully mature, the bud detaches itself from the parent body and develops into new independent individuals.

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subject-cta

Question 1

Q1) Distinguish between the following pair of terms:

(a) Egg and sperms

(b) Sexual Reproduction and asexual reproduction

(c) Budding and Regeneration

Solution:

(a) Egg and Sperm

Sperm Egg
Sperm is capable of performing locomotion. Egg is stationary.
Sperm has a special locomotory organ, the tail. Egg has no locomotory organ.
Sperm is small and made up of head, middle piece and a tail. Egg is large due to the yolk present in it.

(b) Sexual reproduction and asexual reproduction

Sexual reproduction Asexual Reproduction
In this type of reproduction male and female gametes are involved and fertilised In this type of reproduction male and female gametes are not involved
Two organisms or parents are involved to produce an organism A single parent divides itself to two or more number of daughter cells
This type of reproduction can be seen in a higher level of organisms This type of reproduction can be seen in the lower level of organisms
E.g: Humans E.g: Amoeba

(c) Budding and Regeneration

Regeneration Budding
Small broken parts or cut of the body of the organism grows or regenerate into separate individuals. In budding small parts of the body of the parent grows out as a bud which then detaches and becomes a new organism.
Lizards cast off their tails to escape predators & then regenerate them Hydra reproduces by budding using the regenerative cells. A bud develops as an outgrowth in Hydra due to repeated cell division at one specific site.
Planaria can be cut into any number of pieces and each piece grows into a complete organism. When Fully mature, the bud detaches itself from the parent body and develops into new independent individuals.

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subject-cta
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