Tag: introduction to reproduction

Questions Related to introduction to reproduction

Clone is

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. Descendants of a single parent

  2. Vegetatively produced descendants of a single parent

  3. Sexually produced descendants of a single couple

  4. All the above

Show answer
Correct Option: B
Explanation:

A clone is considered as the vegetatively produced descendants of a single parent because of following reason: 

1) Fusion of gametes does not takes place in vegetative propagation so there is no chance of recombination and variation.
2) The parent cell divides to form daughter cell by mitosis due to which the offspring is genetically identical to the parent.
3) The offspring produced are clones of their parent and have same number of chromosomes.
So, the correct answer is option B.

Clones are individuals obtained through

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. Self pollination

  2. Cross pollination

  3. Vegetative propagation

  4. Hybridisation

Show answer
Correct Option: C
Explanation:
Vegetatively propagated plants are the clone of their own parents because of the following reasons:
1) Fusion of gametes does not take place in vegetative propagation so there is no chance of recombination and variation.
2) The parent cell divides to form daughter cell by mitosis due to which the offspring are genetically identical to the parent.
3) The offspring produced are clones of their parent and have the same number of chromosomes.
Self-pollination, cross-pollination and hybridization involve fusion of gametes so it can cause recombination and the offspring produced are variants, not the clone.
So, the correct answer is option C.

Which one of the following statements is not correct regarding vegetative propagation?

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. Vegetative propagation produces clonal population

  2. Micro propagation is the fastest technique of vegetative propagation

  3. Vegetative propagation can go on round the year

  4. Vegetative propagation helps to eliminate the vrius

Show answer
Correct Option: A

The most significant feature of vegetative propagation is that

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. It enables rapid production of genetic variation

  2. It is a means of producing a large population of individuals genetically identical to the parent

  3. It ensures that the progeny are safe from attack of diseases and pests

  4. It is an ancient practice

Show answer
Correct Option: B
Explanation:

Vegetative propagation is a form of asexual reproduction of a plant. Only one plant is involved and the offspring is the result of one parent. The new plant is genetically identical to the parent. The offspring of the plants are clones of the original plant since no mixing of DNA occurs. The most common forms of vegetative propagation are grafting, cutting, layering, tuber, bulb or stolon formation, suckering and tissue culture.

So, the correct option is, 'it is a means of producing a large population of individuals genetically identical to the parent'.

Offspring produced by vegetative propagation are

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. haploid

  2. triploid

  3. genetically identical

  4. superior to offspring produced by sexual reproduction

Show answer
Correct Option: C
Explanation:

Asexual reproduction or vegetative reproduction is when offspring are genetically identical to the parent. The offspring of the plants are clones of the original plant since no mixing of DNA occurs. The most common forms of vegetative propagation are grafting, cutting, layering, tuber, bulb or stolon formation, suckering and tissue culture.

So, the correct option is, 'genetically identical'.

Which of the following are the characteristics

of vegetative reproduction?

X Involves two individuals

Y Daughter cells are genetically identical to the parent

Z The cell divisions are only mitotic

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. X and Y only

  2. X and Z only

  3. Y and Z only

  4. X, Y and Z

Show answer
Correct Option: C
Explanation:
Vegetative reproduction is a type of reproduction in which a single parent is involved. In this there is no formation or fusion of gametes. 
In cloning method of  vegetative reproduction the offspring produced are genetically identical to the parent cell. They are exact copies of the parent and thus are called clones.
Mitosis is a process in which a cell divides into two daughter cells. In this there is distribution of the cytoplasm and genetic material equally into both cells. This is a method of vegetative reproduction in some lower organisms.
Thus the correct answer is option C.

Which of the following is not a vegetative part of plant?

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. Carpel

  2. Thalamus

  3. Stipules

  4. Calyx

Show answer
Correct Option: A
Explanation:

  • In plants, receptacle or thalamus is a thick part of the stem from which the flower organs grow. Stipule is a small leafy outgrowth at the base of the leaf. The sepals of a flower that form a whorl enclosing the petals and forms a protective layer around the flowers.
  • Carpels, on the other hand, is the female reproductive organ in a flower consisting an ovary, a stigma and probably a style. It produces egg cells and protects a developing baby plant.
So the carpels are not vegetative part of the plant. Hence the correct answer is option A

Read the assertion (A) and reason (R) carefully to mark the correct option out of the options given below:
A. There are some plants which have in their life-cycles neither the process of fertilization nor they have meiosis.
R. In these plants, the vegetative or somatic plant body helps in the propagation of the plant.

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation earthworm - reproductive system reproduction in earthworm other modes of vegetative propagation the journey of seeds

  1. Both the Assertion and the Reason are true and the reason is a correct explanation of the assertion.

  2. Both the Assertion and Reason are true but the reason is not a correct explanation of the assertion.

  3. The Assertion is true but the Reason false.

  4. Both the Assertion and Reason are false.

  5. The assertion is false but reason is true.

Show answer
Correct Option: A
Explanation:

Organisms reproduce for perpetuation of species because individuals have a limited life span. Organisms may reproduce sexually as well as asexually. The sexual reproduction involves formation of haploid gametes through the process of reduction division or meiosis. The haploid gametes fuse during fertilization to form diploid zygote. Thus, restoring the normal ploidy. The asexual reproduction does not involves gamete formation through meiosis or their fertilization. The vegetative propagation in plants is a type of asexual reproduction in which plant body is propagated directly from some vegetative part of adult plant.

Therefore, the correct answer is option A.

Growing two or more crops in definite row patterns is known as 

evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation other modes of vegetative propagation the journey of seeds

  1. crop rotation

  2. inter-cropping

  3. mixed cropping

  4. organic cropping

Show answer
Correct Option: B
Explanation:

Intercropping involves growing two or more crops simultaneously on same field but they are not mixed with each other. They are grown in set pattern. They are grown in alternating rows. This pattern prevents pests and diseases to spread in all the plants of one crops in the field. 

Fortilization in earthworm is

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Cross fertilization

  2. Mutual fertilization

  3. Self fertilization

  4. None of these

Show answer
Correct Option: A
Explanation:

Earthworm is a bisexual or hermaphrodite but always shows cross-fertilization due to polyandrous conditions.