Tag: the life cycle of plants

Questions Related to the life cycle of plants

In Melandrium album, absence of which segment of Y chromosome leads to development of a female plant?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Suppressor region

  2. Promoter region

  3. Fertility region

  4. Pairing region

Show answer
Correct Option: A

Which of the following pairs are correctly matched? Plant Organ or Reproduction.
a. Oscillatona - Homogony
b. Nostoc - Aconites
c. Streptomyces - Conidia
d. Albugo - Zoospore
Select the correct answer from the codes given.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. $1, 2$ and $3$

  2. $1, 2, 3$ and $4$

  3. $1, 3$ and $4$

  4. $2$ and $4$

Show answer
Correct Option: A

During the development of ascus and basidium, which one of the following phenomena is common to both?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Exogenous development of reproductive spores

  2. Fusion of two nuclei and subsequent meiotic division

  3. Crozier formation and clap connection

  4. Endogenous development of reproductive spores

Show answer
Correct Option: A

Characters that are transmitted from parents to offspring during reproduction show

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Only similarities with parents

  2. Only variations with parents

  3. Both similarities and variations with parents

  4. Neither similarities nor variations

Show answer
Correct Option: C
Explanation:
  • Character that are transmitted from parent to offspring during reproduction are similar to parent but they may vary due to mutation, crossing over and genetic recombination.

Offspring formed as a result of sexual reproduction exhibit more variations because

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Sexual reproduction is a lengthy process.

  2. Genetic material comes from two parents of the same species.

  3. Genetic material comes from two parents of different species.

  4. Genetic material comes from many parents.

Show answer
Correct Option: B
Explanation:

Offspring formed as a result of sexual reproduction exhibit more variations because genetic material comes from two parents of the same species.

In asexual reproduction, the offspring that are produced are not only identical to the parent but are also exact copies of their parent. It is because in asexual reproduction, there is the involvement of a single parent. So, in this case the genetic variation is not created.
While in sexual reproduction, genetic variation is created and inherited. In sexual reproduction, two parents having different genetic composition participate in the reproductive process and also involve fusion of male and female gametes, which gives rise to the new individual having genetic composition of both.

What is the importance of reproduction?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Regeneration

  2. Replication

  3. Both A and B

  4. Regeneration and passing genes

Show answer
Correct Option: D
Explanation:

  • Reproduction is the method of making a copy of organisms or reproducing young ones. During reproduction, meiosis is the first stage by which gametes are prepared. 
  • Each gamete contains a copy of male or female parents. When a zygote is formed by the fertilization of the gametes, the genetic copy of both the parents come into the offspring. Thus, it helps in the passing of genes.

 Therefore, the correct answer is option D.

Which of the following plant hormones is incorrectly paired with its function?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Auxinpromotes stem growth through cell elongation

  2. Cytokinin initiates senescence

  3. Gibberellinstimulates seed and bud germination

  4. Abscisic acidpromotes seed and bud dormancy

Show answer
Correct Option: B
Explanation:

Natural cytokinins are synthesized in regions where rapid cell division occurs, for example, root apices, developing shoot buds, young fruits etc. They promote nutrient mobilization which helps in the delay of leaf senescence.

So, the correct option is 'Cytokinin initiates senescence'


Which one the following is a requirement for sexual reproduction?

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Male and female parents

  2. Production of gametes

  3. Optimal environmental conditions

  4. Aquatic habitat

Show answer
Correct Option: B
Explanation:

Sexual reproduction is the production of new living organisms by combining genetic information from two individuals of different types (sexes). In most higher organisms, one sex (male) produces a small motile gamete which travels to fuse with a larger stationary gamete produced by the other (female). Nearly all animals employ a diploid-dominant life-cycle strategy in which the only haploid cells produced by the organism are the gametes. Early in the development of the embryo, specialized diploid cells, called germ cells, are produced within the gonads (such as the testes and ovaries)

So, the correct answer is 'production of gametes'

Reproduction may be defined as a phenomenon by which organisms

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. Increase in size

  2. Produce progeny of their own kind

  3. Are produced from single fertilized eggs

  4. Form new tissues and organs

Show answer
Correct Option: B
Explanation:

Reproduction  is the biological process by which new individual organisms – offspring – are produced from their parents. Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction. Reproduction in human beings is by sexual reproduction where both the male and female gametes fertilize to give rise to an embryo. The fertilization of human embryo occurs inside the body of the female 

So, the correct answer is 'produce progeny of their own kind'

Reproduction, unlike other life processes, is not essential to maintain the life of an individual organism.

botany modes of reproduction why do plants reproduce? reproduction and variation the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

  • Reproduction is the biological process by which new individual organisms or 'offsprings' are produced from their 'parents'. Reproduction is a fundamental feature of all known life; each individual organism exists as a result of reproduction. 
  • Though it is not essential, meaning, if someone does not reproduce, it will not end his life.

Therefore, the correct answer is option A.