Tag: asexual reproduction

Questions Related to asexual reproduction

Banana is seedless because

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. It reproduces asexually

  2. It is sprayed by auxin

  3. Both A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:

Bananas are seedless because they are all sterile. They are produced due to asexual reproduction. They reproduce from rhizome or bulb and not from seeds.

Thus, the correct answer is option A.

Select the correct statement regarding parthenocarpy.

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Formation of fruits without fertilisation

  2. Development of seedless fruits as in banana, grapes, navel orange, etc

  3. Auxins and gibberellins are used to include parthenocarpy in different plants

  4. All of these

Show answer
Correct Option: D
Explanation:

The formation of fruits without fertilization is called parthenocarpy. Such fruits are either seedless or non-viable seeds. Parthenocarpy is of two types- 

  • Natural parthenocarpy 
when seedless fruits are produced without any special treatment from the ovaries in the absence of pollination and fertilization, the phenomena is called natural parthenocarpy. For example grapes, banana, pineapple.
  • Induced parthenocarpy 
When seedless fruits are produced by spraying the flower with either water extract of pollen grains or growth promoting hormones that have indole acetic acid, GA, the phenomenon is called induce parthenocarpy. For example tomato, apple.
So, the correct option is 'All of these'


Which one of the following organisms reproduces sexually only once in its life time?

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Banana plant

  2. Mango

  3. Tomato

  4. Eucalyptus

Show answer
Correct Option: A
Explanation:
A. Banana is a perennial plant. It reproduces sexually only once in its lifetime. Hence, it flowers only once its life. After reproducing sexually once, reproduction in the banana plant is done by parthenocarpy. 
B. Mango is a perennial plant because it grows and flowers for more than two years.
C. Tomato is a perennial plant as it continues to grow and flowers for than two years.
D. Eucalyptus is an annual plant. It completes its life cycle within one year and then dies.
So, the correct answer is 'Banana plant'.

What are parthenocarpic fruits?

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Fruits enclosed in pods such as pea

  2. Fruits formed Without fertilization

  3. Very hard fruits

  4. Fruits with more than one seed at their centre

Show answer
Correct Option: B
Explanation:

Parthenocarpy  is the natural or artificially induced production of fruit without fertilization of ovules, which makes the fruit seedless. Stenospermocarpy may also produce apparently seedless fruit, but the seeds are actually aborted while they are still small. Parthenocarpy (or stenospermocarpy) occasionally occurs as a mutation in nature; if it affects every flower the plant can no longer sexually reproduce but might be able to propagate by apomixis or by vegetative means. In some plants, pollination or another stimulation is required for parthenocarpy, termed stimulative parthenocarpy. Plants that do not require pollination or other stimulation to produce parthenocarpic fruit have vegetative parthenocarpy. Seedless cucumbers are an example of vegetative parthenocarpy, seedless watermelon is an example of stenospermocarpy.

So the correct option is 'fruits formed without fertilization'.