Tag: botany

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Questions Related to botany

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

Sporic meiosis occurs in

  1. Animals

  2. Thallophyta

  3. Bryophyta

  4. All plants except thallophyta
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

$32$ 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.

  1. $32$
  2. $16$
  3. $48$
  4. $9$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the leaf (diploid) has 32 chromosomes, the gametes (haploid) have 16. Fertilization of an egg (16) by a sperm (16) produces a zygote (32). The triploid nucleus (endosperm) is formed by the fusion of two polar nuclei (16+16) and one male gamete (16), resulting in 48 chromosomes.

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'.