Tag: life span

Questions Related to life span

The leaves which fall down very soon after their formation are

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

  1. Deciduous

  2. Caducous

  3. Evergreen

  4. None of the above

Show answer
Correct Option: B
Explanation:

Depending upon the duration of leaf, the plants can be classified into caducous, decidous and evergreen. In evergreen plants, leaves are present in all the seasons and do not shed off combindled. Example includes Pine. In deciduous plants, all the leaves shed at one time. Hence, deciduous plants are without leaves during one season. Example includes Ficus. In caducous plants, leaves shed off as the new bud formation takes place. Example includes rose. In this, the leaves fall down very soon after their formation. Thus, the correct answer is 'Caducous.'

Lantana is a

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

  1. Liana

  2. Tree

  3. Herb

  4. Prickly shrub

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Correct Option: D
Explanation:
Lantana is a prickly shrub because it has medium-sized woody stems surrounded by pricks on the branches.
So, the correct answer is D.

Plants without leaves during one season are ________.

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

  1. Caducous

  2. Deciduous

  3. Evergreen

  4. Semigreen

Show answer
Correct Option: B
Explanation:

Depending upon the duration of leaf, the plants can be classified into caducous, decidous and evergreen. In evergreen plants, leaves are present in all the seasons and do not shed off combindly. Example includes Pine. In deciduous plants, all the leaves shed at one time. Hence, deciduous plants are without leaves during one season. Example includes Ficus. In caducous plants, leaves shed off during new bud formation. Example includes rose.

Thus, the correct answer is 'Deciduous.'

Independent alternation of generations is present in

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

  1. Angiosperms

  2. Gymnosperms

  3. Pteridophytes

  4. Bryophytes

Show answer
Correct Option: C
Explanation:

The Pteridophytes are independent of alteration in generation. They can live “independent of the parent plant”. While gametophytes cannot live independently and are very small. The pteridophytes have a vascular plant.

A plant living for a few days is called

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

  1. Annual

  2. Ephemeral

  3. Biennial

  4. Perennial

Show answer
Correct Option: B
Explanation:
  • Ephemeral is any short-lived plant, usually has one or more generations per year, growing only during favorable periods (as when adequate moisture is available) and passing the unfavorable periods in the form of seeds. 
  • Hence the correct option is B. 

The plants that live for more than two years are called :

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

  1. Annuals

  2. Perennials

  3. Biennials

  4. Triennials

Show answer
Correct Option: B
Explanation:

A.Annuals – Plants with a life span of one year or one season.

B.Perennials – Plants with a life span of more than two years.

C.Biennials – Plants with a life span of two years

D.Triennials – Plants with a life span of three years.

So, the correct option is ‘Perennials’

A biennial plant is one which ___________________.

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

  1. Lives for two years but flowers towards the end of the second year

  2. Produces two sets of flowers in a year

  3. Grows during the second year from seeds shed turning the previous year

  4. Lives and grows from year to year

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Correct Option: A

All the individuals with the same genotype constitute an/a.

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

  1. Ecotype

  2. Phenotype

  3. Cerotype

  4. Biotype

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Correct Option: A

Which is amphibious?

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

  1. Casuarina

  2. Wolffia

  3. Polygonum

  4. Hydrilla

Show answer
Correct Option: C

Put a tick mark against the correct alternative in the following statements :
Identify the Kharif crop :

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

  1. Barley

  2. Mustard

  3. Rice

  4. Wheat

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Correct Option: A,C
Explanation:

The crops are usually sown at the beginning of the monsoon season around June and harvested by September or October are called Kharif crops. Eg:Barley, Rice.

So, the correct option is ‘Barley and Rice’.