Tag: life span

Questions Related to life span

Select the monocarpic plant out of the following.

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

  1. Bamboo

  2. Litchi

  3. Mango

  4. All of these

Show answer
Correct Option: A
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.

Read the following statement 
A. Smaller organisms have shorter lifer span and larger organisms have longer life span. 
B. Maximum life span is the characteristic of the species.

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

  1. A is correct

  2. B is correct

  3. A & B are incorrect

  4. A & B are correct

Show answer
Correct Option: A

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

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

  1. Rapidly

  2. Slowly

  3. Can't complete its life cycle

  4. No effect

Show answer
Correct Option: A
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.

Tomato is 

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

  1. Annual

  2. Biennial

  3. Perennial

  4. Mammal

Show answer
Correct Option: A
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.

Mark the incorrect statement.

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

  1. Biennials are less common in the garden.

  2. Pelargonium grandiflorum is a perennial.

  3. Jute is a cash crop.

  4. None of the above.

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Correct Option: B

Which of the following generation is dominant in vascular plants?

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

  1. Gametophytic generation

  2. Diploid sporophytic generation

  3. Haploid sporophytic generation

  4. None of the above

Show answer
Correct Option: B

__________ 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.

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

  1. Hardy annuals

  2. Half hardy annuals

  3. Woody perennials

  4. Ephemeral

Show answer
Correct Option: A
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'

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

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

  1. Annuals

  2. Biennials

  3. Perennials

  4. None of the above

Show answer
Correct Option: A
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.

Which among the following is monocarpic?

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

  1. Coconut

  2. Apple

  3. Bamboo$/$ Agave

  4. Mango

Show answer
Correct Option: C
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.

The gametophyte in alternation generation is described by

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

  1. Diploid generation

  2. Gamete producing generation

  3. Spores producing generation

  4. All of the above

Show answer
Correct Option: B
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.