External Fertilization

Q.

Define external fertilization. Mention its disadvantages.

Q.

Given below are a few statements related to external fertilization. Choose the correct statements.
i The male and female gametes are formed and released simultaneously.
ii Only a few gametes are released into the medium.
iii water is the medium in a majority of organisms exhibiting external fertilization.
iv Offspring formed as a result of external fertilization have better chance of survival than those formed inside an organism.
(a) iii and iv (b) i and iii
(c) ii and iv (d) i and iv.

Q. Parthenogenesis is found in

1. Wasps
2. Frogs
3. both a and b
4. Honey bee

Q. Select the incorrect statement.

1. reptiles are true land vertebrates
2. moulting is seen in snakes
3. reptiles have cloaca
4. All reptiles are viviparous.

Q.

External fertilisation is seen in -

1. Majority of Algae

2. Bony fishes

3. Frogs

4. All of these

Q. Which of the following does not exhibit internal fertilization?

1. Frog
2. Lizard
3. Cow
4. Crow

Q.

Which of the following animal lays an unfertilized egg?

1. Rana

2. Pteropus

3. Duck billed platypus

4. Naja

Q. In hemichordates

1. sexes are separate.
2. Fertilization is internal.
3. Development is direct.
4. Sexes are united.

Q. In a practical test, a student has to identify the organisms in which syngamy does not occur. In those organisms the female gamete undergoes development to form new organisms without fertilization. This phenomenon is called "X". Identify the organisms and the phenomenon "X".

1. Frog, Parthenogenesis
2. Lizards, Gametogenesis
3. Rotifers, Embryogenesis
4. Honeybee, Parthenogenesis

Q. Syngamy occurs outside the body in:

1. Fungi
2. Algae
3. Mosses
4. Ferns

Q.

What is fertilization? Distinguish between external fertilization and internal fertilization?

Q. Which of the following is not true about external fertilization?

1. Organisms exhibiting external fertilisation show poor synchrony between the sexes
2. Organisms exhibiting external fertilization release a large number of gametes into the surrounding medium
3. Large number of offspring are produced
4. Offspring are extremely vulnerable to predators

Q.

Read the following statements and identify the incorrect one(s) related to external fertilisation.

1. Organisms show great synchrony between sexes and release both the gametes simultaneously.

2. Not only the male gametes but also female gametes are released in large numbers.

3. Less number of offsprings are produced as fusion of male and female gametes is a chance.

4. Offsprings are extremely vulnerable to predators threatening their survival up to adulthood.

Q. Fertilisation that occurs outside the organisms, in an external medium is called

1. internal fertilisation
2. external fertilisation
3. syngamy
4. fusion

Q.

Define external fertilization. Mention its disadvantages.

Q. Which of the following undergo external fertilisation?

1. Crustaceans
2. Bryophytes
3. Molluscs
4. Echinoderms

Q. Which of the following does not exhibit internal fertilization?

1. Frog
2. Lizard
3. Cow
4. Crow

Q.

External fertilization is characterized by sperm fertilizing the egg within the female. True or false?

1. True

2. False

Q.

External fertilisation is seen in -

1. Majority of Algae

2. Bony fishes

3. Frogs

4. All of these

Q. Match column I with column II and select the correct option from the codes given below.

1. $A-\left(iv\right),B-\left(i\right),C-\left(iii\right),D-\left(ii\right)$
2. $A-\left(i\right),B-\left(ii\right),C-\left(iv\right),D-\left(iii\right)$
3. $A-\left(iv\right),B-\left(i\right),C-\left(ii\right),D-\left(iii\right)$
4. $A-\left(i\right),B-\left(ii\right),C-\left(iii\right),D-\left(iv\right)$

Q. Which one of the following is a Coelenterate?

1. Sea mouse
2. Sea anemone
3. Sea urchin
4. Sea cucumber

Q. Crabs undergo
fertilisation whereas humans undergo
fertilisation.

1. double
2. internal
3. single
4. external

Q. In which animals, external fertilisation is most frequent?

1. Terestrial
2. Aquatic
3. Both A and B
4. None of the above

Q. External fertilisation takes place in

Q. Where is jelly deposited as a covering on the egg of frog?

1. In the oviduct
2. In the water during fertilisation
3. In the water after fertilisation
4. In the ovary

Q. Phylum Annelida resembles Mollusca in embryonic features as both have

1. Spiral cleavage and mesoderm formation
2. Meroblastic cleavage and ectoderm formation
3. Special types mouth parts
4. Trochophore larva in their life cycle

Q. In which animal parthenogenesis is common?

1. Rats
2. Hens
3. Aphids
4. Monkeys

Q. Write the scientific names of Fruitfly. Why did Morgan prefer to work with Fruitflies for his experiments ? State any three reasons.

Q.

Which of the following animal lays an unfertilized egg?

1. Rana

2. Pteropus

3. Naja

4. Duck billed platypus

Q.

The following statements and identify the incorrect one(s) related to external fertilisation.

1. Organisms show great synchrony between sexes and release both the gametes simultaneously.

2. Not only the male gametes but also female gametes are released in large numbers.

3. Less number of offsprings are produced as fusion of male and female gametes is a chance.

4. Offsprings are extremely vulnerable to predators threatening their survival up to adulthood.