Tag: alternation of generations

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Questions Related to alternation of generations

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Select the monocarpic plant out of the following.

  1. Bamboo

  2. Litchi

  3. Mango

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Monocarpic plants flower only once in their life. After flowering they produce fruits and die. Certain bamboo species. (e.g., Bambusa tulda) flower only once in their lifetimes, usually after $50-100$ years. They produce large number of fruits and then die.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Under extreme climatic conditions, a biennial plant may complete its life cycle 

  1. Rapidly

  2. Slowly

  3. Can't complete its life cycle

  4. No effect
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Under extreme climatic conditions, a biennial plant may complete its life cycle rapidly (i.e., three months instead of two years). This is quite common in vegetable or flower seedlings that were exposed to cold conditions, or vernalized, before they were planted in the ground. This behavior leads to many normally biennial plants being treated as annuals in some areas.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Tomato is 

  1. Annual

  2. Biennial

  3. Perennial

  4. Mammal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The tomato plant is perennial, but is cultivated as an annual. Tomatoes are called as "tender perennials" because they are truly perennials but they are generally grown as annuals. Other examples of "tender perennials" are bell peppers and sweet potatoes. An annual plant is a plant that usually germinates flowers and dies in one year. True annuals will only live longer than a year if they are prevented from setting seed. A perennial is a plant that lives for more than two years. Some perennials are grown in gardens as annuals, mostly for convenience especially, if they are not considered cold or climate hardy. Tomato are true perennials but tropical annuals includes tomato.

Therefore, the correct answer is option A.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Which of the following generation is dominant in vascular plants?

  1. Gametophytic generation

  2. Diploid sporophytic generation

  3. Haploid sporophytic generation

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

In vascular plants (tracheophytes), the diploid sporophyte is the dominant phase of the life cycle. The gametophyte is reduced and dependent on the sporophyte.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

__________ are plants that go through their entire life cycle in one season and that can be sown outside in the open garden in spring when it flowers.

  1. Hardy annuals

  2. Half hardy annuals

  3. Woody perennials

  4. Ephemeral
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Seedlings of Hardy annuals can easily endure the spring. Hence, they can be sown outside in the open garden in spring on flowering.
So, the correct answer is 'Hardy annuals'
Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Plants that perform their entire life from seed to flower and then to seed within a single growing season is known as

  1. Annuals

  2. Biennials

  3. Perennials

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

A- Annuals are plants that perform their entire life cycle within a single growing season. While biennials complete their life cycle in two years & Perennials live for more than two years.

Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

Which among the following is monocarpic?

  1. Coconut

  2. Apple
  3. Bamboo$/$ Agave

  4. Mango
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Which among the following is monocarpic
$\Rightarrow$ Bamboo/Agave(century plant)
$\Rightarrow$ Monocarpic plants are those that flower, set seeds and then die.
$\Rightarrow$ The plant can live a number of years before it will flower. Flowering does not by itself result in the death of the plants but the production of fruits and seeds causes change changes within the plants which lead to death.
Multiple choice botany types and parts of plants plant life cycle alternation of generations life span

The gametophyte in alternation generation is described by

  1. Diploid generation

  2. Gamete producing generation

  3. Spores producing generation

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The gametophyte generation is also called a sexual phase. Here the haploid gametes are produced from the mother cell. Gametes have a single set of chromosomes, which gradually combine with another haploid gamete to give rise to a diploid cell.

The correct answer is B.