Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

Which plant will lose its economic value, if its fruits are produced by induced parthenocarpy?

  1. Grape

  2. Pomegranate

  3. Orange

  4. Banana
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seeds having fleshy testa are the edible parts in pomegranate. In case of induced parthenocarpy, the seeds will not be produced thereby making fruit seedless. Therefore they become useless and lose their economic importance. 

So, the correct answer is 'pomegranate'

Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

The male cone of Pinus is formed of

  1. Anthers

  2. Megasporophylls

  3. Ligules

  4. Microsporophylls
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The male cones are borne in a cluster on a branch of unlimited growth behind the apical bud, in the axil of a scale leaf. A cone consists of a central axis bearing 60- 135 microsporophylls in spiral manner. It is therefore, comparable female flower of angiosperm.

Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

It is possible to produce seedless tomato fruits by

  1. Spraying hormones on flowers

  2. Spraying mineral solution on plants

  3. Applying trace elements in tomato fields

  4. Applying fertilizers containing radioactive elements
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Seedless tomato fruit can be grown without fertilization if the plant growth hormone is sprayed on them. This will result in their parthenocarpy. This is the technique of induced parthenocarpy where the vegetables are sprayed with plant growth regulators. 

Show the correct option is 'Spraying hormones on flowers'

Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

Select the correct statement regarding parthenocarpy.

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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'


Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

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

  1. Banana plant

  2. Mango

  3. Tomato

  4. Eucalyptus
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

What are parthenocarpic fruits?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

Multiple choice botany through the alimentary canal nutrition and its types types of nutrition in plants different modes of nutrition in plants

An association of two species where both the partners derive mutual benefit from each other is known as

  1. Parasitism

  2. Symbiosis

  3. Commensalism

  4. Predation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mutualism or symbiosis is a mutually beneficial relationship between individuals of two different species. None of the two is capable of living separately. Mutualism and symbiosis are synonyms though symbiosis was formerly considered to be any interaction between two different organisms. Some workers also consider symbiosis to be mutualism, which involves close physical contact. Mutualism or symbiosis is generally considered to be obligatory e.g., nitrogen fixing Rhizobium bacteria living in root nodules of leguminous plants and mycorrhizae (fungus living in association with roots of higher plants like Gymnosperms).