Tag: parthenogenesis

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Questions Related to parthenogenesis

Multiple choice botany life processes in living organisms- part 2 parthenocarpic fruits parthenogenesis the life cycle of plants

Development of an embryo directly from an egg cell without the participation of a male gamete is termed as 

  1. Apospory

  2. Parthenogenesis

  3. Apogamy

  4. Both B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parthenogenesis is a form of asexual reproduction in which growth and development of embryos occur without fertilization. Parthenogenesis occurs naturally in many plants. The word parthenogenesis comes from the Greek; parthenos meaning virgin and genesis meaning birth.

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

The parthenocarpy is not advantageous in ......................

  1. Mango

  2. Coconut

  3. Pomegranate

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A parthenocarpy fruit is a kind of fruit which is artificially grown, it is a seedless fruit which cannot reproduce by sexual means but only by asexual ones. Pomegranate fruit has only one edible part, that is seeds. Thus, parthenocarpic seeds cannot be produced in pomegranates.

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

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

  1. Epidermis from corpus and hypodermis from tunica

  2. Epidermis from tunica and hypodermis from corpus

  3. Both from tunica

  4. Both from corpus
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Sal wood

  2. Chir wood

  3. Teak wood

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

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

Which of the following is a stimulative parthenocarpy?

  1. Seedless cucumber

  2. Seedless watermelon

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Parthenocarp is a fruit

  1. Formed from superior ovary

  2. Formed from inferior ovary

  3. Consisting of ripened ovary and thalamus

  4. Which does not possess seeds
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.
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.