Tag: botany

Questions Related to botany

Which of the following organisms breeds only once in life time

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

  1. Bamboo

  2. Oysters

  3. Pelagic fishes

  4. Birds

  5. Mammals

Show answer
Correct Option: A
Explanation:
Bamboo flower only once in their life, generally after 50 - 100 years. They produce a large number of fruits and die. They rely on seed to perpetuate themselves. 
Oysters usually reach maturity in one year. 
Birds mate only once per year.
Mammals breeding cycle comes once a month.
Pelagic fishes is a seasonal breeder.
So, the correct answer is option A.

In first year, biennial plants are only

botany diversity in living things and their classification plant life cycle alternation of generations life span

  1. Reproductive

  2. Vegetative

  3. Both A and B

  4. None of the above

Show answer
Correct Option: B
Explanation:

Biennial are plants whose entire life cycle occurs within two years. In the first year, these plants are only vegetative, meaning that they don't produce reproductive structures. Rather, these plants will grow roots below ground and a small rosette of leaves near the surface

Plants which flower only once are

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

  1. Pericarpic

  2. Monocarpic

  3. Polycarpic

  4. Cleistocarpic

Show answer
Correct Option: B
Explanation:

Monocarpic plants flower only once in their lifetime and die immediately after the seeds are set. Also known as hapaxanth and semelparous these plants may take a long time to flower and set seeds.Example of this type of plants is Agave americana, which takes many years to flower once at times more than 50 years. 

So, the correct answer is 'Monocarpic'

A plant lives for less than one year is called

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

  1. Annual

  2. Biennial

  3. Semi-annual

  4. Perennial

Show answer
Correct Option: A
Explanation:

A plant which can be grown only once in a year is an annual plant. A plant lives for less than one year is also called an annual plant because it cannot be grown again to complete two lifetimes in just one year.

So, the correct answer is "annual'.

Identify a monocarpic plant from the following

botany diversity in living things and their classification plant life cycle alternation of generations life span

  1. Cuscuta

  2. Agave

  3. Mangifera

  4. Dalbergia

Show answer
Correct Option: B
Explanation:

A. Cuscuta is a parasitic plant with smallest flowers many times. It blooms many times. so it is a polycarpic plant  

B. Agave americana is a monocarpic plant because it flowers only once in its lifetime of 10 years and dies.
C. Mangifera indica is also a polycarpic plant as it flowers every year during its season.
D. Dalbergia plant flowers more than once in its lifetime.
So, the correct option is B

Grasses, non flowering plants, shrubs and trees are examples of

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

  1. Climax Community

  2. Perennial Plants

  3. Secondary Succession

  4. Primary Succession

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Correct Option: B

Some plants flower only once in their life, generally after 50 - 100 years. They produce a large number of fruits and die

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

  1. Strobidanthus kunthiana

  2. Bamboo

  3. Callistemon linearis

  4. Cymbopogon reptocus

Show answer
Correct Option: B
Explanation:

Bamboo flower only once in their life, generally after 50 - 100 years. They produce a large number of fruits and die. They rely on seed to perpetuate themselves. 

Strobidanthus kunthiana flowers one in twelve years.
Callistemon linearis flowers normally in spring and early summer every year.
Cymbopogon reptocus is a lemon grass which rarely flowers and has no specific pattern of flowering. It is a monocot.
So, the correct answer is option B. 

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.