Typically, external fertilization takes place in an aquatic medium, wherein both the sperm and the eggs are released into the water. Once the sperm reaches the eggs, fertilization occurs. It is during spawning that most of the external fertilization occurs, wherein one or more females deliver their eggs, and the males release their sperms at the same time in the same area. The length of the daylight or even the ambient temperature of the water can affect the release of the reproductive substance. This process is in contrast to internal fertilization, which occurs inside the female body.

Solve some important NEET questions on External fertilization below:

1. Pre-fertilization events among these are

(a) Formation of zygote

(b) Gametogenesis and gamete transfer

(c) Syngamy

(d) Embryogenesis

Answer: (b)

2. The most critical event in sexual reproduction is

(a) Fertilization (Syngamy)

(b) Gamete transfer

(c) Embryogenesis

(d) Gametogenesis

Answer: (a)

3. External fertilization is seen in all of these except

(a) Mammals

(b) Fishes

(c) Amphibians

(d) Algae

Answer: (a)

4. Pick the incorrect statement.

(a) In seed plants, motile male gametes are carried to female gametes by pollen tubes.

(b) External fertilization is shown by bony fishes and frogs.

(c) Offspring produced by external fertilization are extremely vulnerable to predators.

(d) Large numbers of gametes are released in surrounding water in external fertilization.

Answer: (a)

5. The chances of survival of the young one is greater in

(a) Viviparous animals

(b) Oviparous animals

(c) External fertilization

(d) Internal fertilization

Answer: (a)

6. Animals having cleidoic eggs show

(a) Internal Fertilization and internal development

(b) External fertilization and internal development

(c) External Fertilization and external development

(d) Internal fertilization and external development

Answer: (d)

7. Regarding organisms exhibiting internal fertilization, those displaying external fertilization exhibit

(a) less vulnerability to predation

(b) larger size of females in comparison to males

(c) high level of synchronisation between sexes

(d) greater variations

Answer: (c)

8. This about external fertilization is incorrect

(a) Parental care is not provided to offsprings

(b) It requires an aquatic medium

(c) Offsprings produced are highly vulnerable to predators

(d) None of the above

Answer: (d)

9. Dioecy is the mechanism for some plants to

(a) Promote self-fertilization

(b) Promote cross pollination

(c) Promote autogamy

(d) All are incorrect

Answer: (b)

10. Pick the correct statement related to external fertilization.

i. Water is the medium in a majority of organisms exhibiting external fertilization.

ii. Offspring formed as a result of external fertilization have a better chance of survival than those formed inside an organism.

iii. The male and female gametes are formed and released simultaneously.

iv. Only a few gametes are released into the medium.

(a) i and iii

(b) i and ii

(c) ii and iii

(d) ii and iv

Answer: (a)

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