Tag: the life cycle of plants

Questions Related to the life cycle of plants

A phenomenon is termed as parthenogenesis when 

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Artificial fertilization occurs

  2. Egg is fertilized by a sperm

  3. Egg undergoes cleavage without fertilization

  4. Sperm dies before fertilization

Show answer
Correct Option: C
Explanation:

The term parthenogenesis was coined by Charles Bonnet. It is also called the virgin birth. Parthenogenesis refers to the process of formation of the organism from an unfertilized egg (it is a special type of asexual reproduction). Parthenogenesis is of the following three types:

1) Arrhenotoky: male develops parthenogenically.
2) Thelytoky: Female develops parthenogenically.
3) Amphytoky: Parthenogenesis results in any sex depending on environmental conditions.
So, considering all the information the correct answer is 'Egg undergoes cleavage without fertilization'.

In apomictic/parthenogenetic development the individuals are

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. Morphologically and genetically similar

  2. Morphologically and genetically different

  3. Morphologically similar but genetically different

  4. None of the above

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Correct Option: A
Explanation:

Development of an embryo from an unfertilized egg cell is called as parthenogenesis. The offsprings produced through apomictic are similar in morphological and genetical characters.

So the correct answer is 'Morphologically and genetically similar.'

State whether the following statements are true or false.
Formation of fruit without fertilization is called parthenogenesis.

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Parthenocarpy (literally meaning "virgin fruit") is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Pathogenesis is the reproduction from an ovum without fertilization, especially as a normal process in some invertebrates and lower plants.

So, the correct option is, 'False'.

Which of the following characterizes parthenogenesis?

zoology reproduction in organisms parthenocarpic fruits parthenogenesis the life cycle of plants

  1. An individual may change its sex during its lifetime

  2. Specialized groups of cells may be released and grow into new individuals

  3. An egg develops without being fertilized

  4. Both members of a mating pair have male and female reproductive organs

Show answer
Correct Option: C
Explanation:

Parthenogenesis, a reproductive strategy that involves the development of a female gamete (sex cell) without fertilization. An egg produced parthenogenetically may be either haploid (i.e., with one set of dissimilar chromosomes) or diploid (i.e., with a paired set of chromosomes). Parthenogenesis has received considerable attention as a tool for the production of stem cells. The possibility of deriving stem cells from parthenogenetic embryos could eliminate the requirement to produce and destroy viable embryos and may reduce the ethical concerns surrounding stem cell research. 

So the correct option is 'an egg develops without being fertilized'.