Tag: the life cycle of plants

Questions Related to the life cycle of plants

Which of the following is true for the origin of epidermis and hypodermis

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Epidermis from corpus and hypodermis from tunica

  2. Epidermis from tunica and hypodermis from corpus

  3. Both from tunica

  4. Both from corpus

Show answer
Correct Option: B
Explanation:

According to the tunica - corpus theory epidermis is d reined from outer layer of tunica and the remaining tissues are derived from remaining layer of tunica and entire corpus.

Choose the correct answers from the alternatives given.
Vessels are not found in

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Sal wood

  2. Chir wood

  3. Teak wood

  4. Shisham wood

Show answer
Correct Option: B
Explanation:

The presence of vessels is a characteristic feature of angiosperms. Gymnosperms and pteridophyte lack vessels though other xylary elements are present for conduction of water and minerals. Primitive angiosperm families like Tetracentraceae, Trochodendraceae and Winteraceae do not have vessels. Except for Chir wood, others are examples of angiosperms that possess vessels.

Hence, the correct answer is 'Chir wood'.

Which of the following is a stimulative parthenocarpy?

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Seedless cucumber

  2. Seedless watermelon

  3. Both A and B

  4. None of the above

Show answer
Correct Option: C
Explanation:

Parthenocarpy is the mode of development of fruits without fertilization and the fruits thus formed are seedless.
Two types are known. 

Vegetative parthenocarpy occurs without pollination which results in the formation of seedless fruits e.g., seedless cucumbers, pear, and fig. In stimulative parthenocarpy, the plants can produce fruits only after being stimulated either through pollination or any other means. Examples of this are seen in seedless watermelon where the seeds are dropped when they are very small and in seedless grapes. Therefore, the correct answer is option C.

Parthenocarp is a fruit

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Formed from superior ovary

  2. Formed from inferior ovary

  3. Consisting of ripened ovary and thalamus

  4. Which does not possess seeds

Show answer
Correct Option: D
Explanation:
When ovules are not fertilised during pollination, it leads to their degeneration. If in this case a fruit is formed it will not have any seeds and will be called parthenocarp or the virgin fruit meaning that it was developed without fertlisation.
So, the correct answer is 'Which does not possess seeds'.

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

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Grape

  2. Pomegranate

  3. Orange

  4. Banana

Show answer
Correct Option: B
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'

The male cone of Pinus is formed of

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Anthers

  2. Megasporophylls

  3. Ligules

  4. Microsporophylls

Show answer
Correct Option: D
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.

The formation of embryo without fusion of gametes is termed as 

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Apospory

  2. Isogamy

  3. Apogamy

  4. Syngamy

Show answer
Correct Option: C
Explanation:

The formation of the plant from gametophytic cell without fertilization is called apogamy.

So, the correct answer is 'Apogamy'

It is possible to produce seedless tomato fruits by

botany the life cycle of plants parthenocarpic fruits parthenogenesis asexual reproduction

  1. Spraying hormones on flowers

  2. Spraying mineral solution on plants

  3. Applying trace elements in tomato fields

  4. Applying fertilizers containing radioactive elements

Show answer
Correct Option: A
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'

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'