Tag: botany

Questions Related to botany

Sporic meiosis occurs in

botany life processes in living organisms- part 1 introduction to flower pre fertilization - plants modes of reproduction

  1. Animals

  2. Thallophyta

  3. Bryophyta

  4. All plants except thallophyta

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Correct Option: D
Explanation:

Sporic meiosis, has mitosis in two stages, both the diploid and haploid stages, termed diplobiontic. 

Sporic meiosis occurs in all plants except thallophyta. In sporic meiosis, the division by mitosis happens to create a multicellular diploid organism, the sporophyte. Some of the cells of the sporophite then produce spores through a sporic meiosis. In this case, the meiosis is sporic (because it produces spores). The spores then produce a haploid gametophyte which, in turn, will produce the gametes through mitosis. 

$32$ chromosomes are present in the green leaf of Onion. When meiosis takes place to produce gametes after fertilization how many chromosomes will be there in triploid nucleus.

botany asexual and sexual reproduction in plants introduction to flower pre fertilization - plants modes of reproduction

  1. $32$

  2. $16$

  3. $48$

  4. $9$

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Correct Option: C

Select the mismatched pair:-

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

  1. Ginger - Organ of perennation

  2. Citrus - Stem thorns

  3. Opuntia - Leaf spines

  4. Watermelon - Leaf tendril

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Correct Option: A

Which of the following is a parthenocarpic fruit?

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

  1. Dicot exalbuminous seed - Bean

  2. Monocot albuminous - Maize

  3. Scutellum - Endosperm in maize

  4. Coleorhiza - Radicle sheath in maize

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Correct Option: A

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

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

  1. Apospory

  2. Parthenogenesis

  3. Apogamy

  4. Both B and C

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Correct Option: D
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.

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

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

  1. Mango

  2. Coconut

  3. Pomegranate

  4. None of the above

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Correct Option: C
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.

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

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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

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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

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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

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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'.