Tag: different modes of reproduction

Questions Related to different modes of reproduction

Asexual reproduction is the _____ method of reproduction in organisms that have a relatively simple organisation like _______ and _______.
Fill in the blank in the above statement.

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Rare, plant, bacteria

  2. Common, plant, bacteria

  3. Common, algae, fungi

  4. Rare, algae, fungi

Show answer
Correct Option: C
Explanation:

Asexual reproduction is a common method of reproduction by which offspring arise from a single parent and inherit the genes of that parent only. An important form of fission (a type of asexual reproduction) is binary fission, where the parent organism is replaced by two daughter organisms. Only prokaryotes (the archaea and the bacteria) reproduce asexually through binary fission. Eukaryotes (unicellular fungi) may reproduce in a functionally similar manner by mitosis. Multiple fission at the cellular level occurs in many protists, e.g. algae. The nucleus of the parent cell divides several times by mitosis, producing several nuclei. The cytoplasm then separates, creating multiple daughter cells.

Thus, the correct option is 'Common, algae, fungi.'

Which of the following options shows bisexual animals only?

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Amoeba, sponge, leech

  2. Sponge, cockroach, Amoeba

  3. Earthworm, sponge, leech

  4. Tapeworm, earthworm, honeybee

Show answer
Correct Option: C
Explanation:
When both male and female sex organs are present in the same individual, such animals are called hermaphrodite or bisexual, e.g, tapeworm, earthworm and leech.
So, the correct answer is 'Earthworm, sponge, leech'.

Which of the following is not correct regarding sexual reproduction?

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. It is usually biparental

  2. Gametes are always formed

  3. It is a slow process

  4. It involves only mitosis

Show answer
Correct Option: D
Explanation:

Sexual reproduction involves both meiosis and mitosis. Meiosis occurs at the time of gamete formation. Repeated mitotic divisions occur in the zygote to form an embryo.

So, the correct answer is 'It involves only mitosis'.

Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Sexual reproduction is a lengthy process

  2. Gametes of parents have qualitatively different genetic composition

  3. Genetic material comes from parents of two different species

  4. Greater amount of DNA is involved in sexual reproduction

Show answer
Correct Option: B
Explanation:

Asexual reproduction is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that single parent only. During sexual reproduction, fertilization creates a single-celled zygote which includes genetic material from both gametes. Therefore, the complex mixture of genetic material causes a great variation in the offspring. 
So, the correct option is 'Gametes of parents have qualitatively different genetic composition'.



Asexual method of reproduction by binary fission is common to which of the following?
(i) Some eukaryotes
(ii) All eukaryotes
(iii) Some prokaryotes
(iv) All prokaryotes

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iv)

  4. (iii) and (iv)

Show answer
Correct Option: C
Explanation:

Binary fission is a method of separating a body into two new bodies. In this process, an organism duplicates its genetic material and divides into two parts where every new organism receives one copy of DNA. 

This type of asexual reproduction and the most common form of reproduction in prokaryotes and some single-celled eukaryotes.  
 
So the answer is '(i) and (iv)'.

Haplodiploidy is found in

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Grasshoppers and cockroaches

  2. Birds and reptiles

  3. Butterflies and moths

  4. Honeybees, ants and wasps

Show answer
Correct Option: D
Explanation:

Haploid-diploid mechanism or Haplodiploidy is a unique phenomenon in which an unfertilized egg develops into a male and a fertilized egg develops into a female. Therefore, the female is diploid (2n), and the male is haploid (n). Eggs are formed by meiosis and sperms by mitosis. Fertilization restores the diploid number of  chromosomes in the zygote which gives rise to the female, If the egg is not fertilized, it will still develop but into a male (arrhenotoky or arrhenotokous parthenogenesis). It is seen in hymenopterous insects, such as bees, wasps, saw flies and ants. So, the correct answer is 'Honeybees, ants and wasps'.

Choose the correct statements from the options below with regard to sexual reproduction.
(i) Sexual reproduction does not always require two individuals.
(ii) Sexual reproduction generally involves gametic fusion.
(iii) Meiosis never occurs during sexual reproduction.
(iv) External fertilization is a rule during sexual reproduction.

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. (i) and (iv)

  2. (i) and (ii)

  3. (ii) and (iii)

  4. (ii) and (iv)

Show answer
Correct Option: B
Explanation:

(i) sexual reproduction does not require two individuals because the fusion of two gametes released from the same plant can take place.

(ii) sexual reproduction is a process where gametic fusion is present because takes place between two gametes of different sexes 
(iii) meiosis occurs during sexual reproduction when the plant body is haploid or the gametes are diploid to produce the normal body.
(iv) external fertilization need not takes place in sexual reproduction. it can also be internal. eg: humans.
So, the correct option is '(i) and (ii)'.

Panmictic plant multiplies

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Sexually

  2. Asexually

  3. Parthenogenetically

  4. By stolons

Show answer
Correct Option: A
Explanation:

The panmictic plant is a plant which has immense potential to breed. It undergoes random meeting which has no mating restrictions, neither genetic nor behavioural. The mating takes place by sexual reproduction. Due to mating by sexual reproduction, recombination takes place and eventually, leads to genetic variation. It causes the change in the genetic pool.

So, the correct answer is option A.

Which one of the following generates new genetic combinations leading to mutations

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Nucellar polyembryony

  2. Vegetative reproduction

  3. Parthenogenesis

  4. Sexual reproduction

Show answer
Correct Option: D
Explanation:
  • Sexual reproduction is the reproduction which is caused by the fusion of gametes. The male and female gametes fuse to form the zygote. 
  • Due to the fusion of gametes the product of sexual reproduction generally generates new genetic combinations leading to variations. 
  • The organism develops from the zygote which has characters of both the parents. 
  • The genome of the offspring is formed by the recombination of genetic material so they are also known as recombinants. The recombination may cause the sudden heritable change in the gene pool which causes mutations.
So, the correct answer is option D.

Which of the following patterns of reproduction involves both the parents?

zoology plant reproduction different modes of reproduction sexual and asexual reproduction lifespan, reproduction and variation

  1. Sexual reproduction

  2. Asexual reproduction

  3. Both A and B

  4. None of these

Show answer
Correct Option: A
Explanation:

Sexual reproduction is a biological process that creates a new organism by combining the genetic material of two organisms, by the fusion of one gamete from each. Motile male gamete generally fertilizes with nonmotile female gamete in this process.
Thus, the correct answer is option A.