Question

(a) List the three states the annuals and biennial angiosperms have to pass through during their life cycle.

(b) List and describe any two vegetative propagules in flowering plants.         (3) 

CBSE Class XII Biology Question Paper 2017

Answer 1

Vegetative propagules are the parts/units of a plant which can be used for vegetative propagation, e.g. roots, stems, leaves, etc.



Root propagules include the production of a new plant via roots, e.g. fleshy roots in case of sweet potato, tapioca and Dahlia.

Vegetative propagation through leaves, many plant leaves have adventitious buds which help in the development of a new plant, e.g. Begonia, Bryophyllum, etc

Answer 2

Angiosperms are vascular plants whose seeds are found in a flower.

Explanation:

a) Three states of angiosperms during their life cycle are as following:

1. Vegetative or Juvenile phase - In this phase plants attain a certain growth and maturity before undergoing reproduction.
2. Reproductive phase - In this phase plants undergoes reproduction and  represented by appearance of flowers.
3. Senescent phase - This is the period in which plants loss their ability to grow and reproduce.

b) Two vegetative propagules in flowering plants are:

1. Roots: Roots ar eused as vegetative propagules to produce a new plant, for example sweet potato and dahlia.
2. Leaves: Leaves are also used as vegetative propagles and produces buds through leaves to produce new plant, for example Bryophyllum.

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