Tag: biology

Questions Related to biology

In Bryophyllum, vegetative propagation takes place through their 

  1. Leaf

  2. Stem

  3. Root

  4. Pollen


Correct Option: A
Explanation:

Bryophyllum produces plantlets along the margins of its leaves. When they mature, they drop off and root in any suitable soil beneath thereby performing the function of vegetative propagation.
Thus, the correct answer is option (A), 'Leaf'.

Ramu collected epiphyllous buds from a plant. The plant from which he has collected these buds can be?

  1. Murraya

  2. Bryophyllum

  3. Neem

  4. Hibiscus


Correct Option: B
Explanation:

When the buds arises on the leaves they are called as epiphyllous buds, e.g., Bryophyllum. Epiphyllous budding is a unique mode of vegetative proliferation in restricted plant species. Leaf detachment induces activation of these buds which then develop into plantlets by differentiating roots and shoot. Leaf detachment not only induces bud differentiation but also concurrently triggers foliar senescence. Inflorescences and vegetative shoots arise from epiphyllous buds on the adaxial surface of the rachis between the pinna pairs.  

In Bryophyllum, vegetative reproduction takes place through

  1. Root

  2. Stem

  3. Leaf

  4. Rhizome


Correct Option: C
Explanation:

Bryophyllum produces plantlets along the margins of its leaves. When they mature, they drop off and root in any suitable soil beneath.
Thus, the correct answer is option (C), 'Leaf'.

Leaves : Bryophyllum :: Stem : 

  1. Potato

  2. Turmeric

  3. Ginger

  4. All of the above


Correct Option: D
Explanation:
Potato, turmeric and ginger are modified stem and perform the function of food storage.
Reproduction in Bryophyllum occurs asexually through vegetative propagation by leaves.
So the correct option is 'Potato, turmeric, ginger'.

The potatoes are called modified stem because of:

  1. Eye of potato

  2. Tuber

  3. Bud

  4. Both A and B


Correct Option: D
Explanation:
In potato the under ground portion is a modified stem in that it stores reserve food and has all characters of stem i.e. roots and shoots appear from it and it has buds (eyes) also. Potato is a tuber (that part carry out photosynthesis- the green color part seen in young potato). It is called a modified stem as it has scaly leaves, nodes, internodes and adventitious roots, characteristic to stems.
Hence answer is 'Both A and B'

Other than potato, turmeric is reproduces by 

  1. Leaves

  2. Roots

  3. Stem

  4. All of the above


Correct Option: C

A loose bulb is a

  1. False bulb

  2. Simple tunicated bulb

  3. Compound tunicated bulb

  4. Scaly bulb


Correct Option: A

Leaf cuttings are used for quick vegetative propagation of

  1. Sansevieria

  2. Jasminum

  3. Tea

  4. Blackberry


Correct Option: A
Explanation:

Vegetative propagation is the growth and development of the plant by asexual means. It occurs from specialized vegetative plant parts. It is made possible by meristem tissue that is commonly found within stems and leaves, as well as at the tips of roots and stems. Meristem tissue contains undifferentiated cells that actively divide by mitosis allowing plant growth.

Sansevieria plant has long leaves with meristem tissue at the tip as well as at margins. Cutting of leaf can give rise to adventitious roots for plant growth.
Jasmine, blackberry and Tea are propagated by layering and stem cuttings. Thus, the correct answer is option A.

In whichplant, root will form a new plant?

  1. Populus

  2. Dahlia

  3. Azadirachta

  4. Both A and B


Correct Option: D
Explanation:

Populus and Dahlia's plants have the apical meristematic tissue at the tip of their roots.Populus has long roots while Dehlia has tuberous roots.The meristematic tissue cells have the capacity to divide actively and form a new plant in favourable conditions.

Azadirachta genus, which includes trees like Neem,  can be grown easily by planting seeds. Root cuttings can also produce plants.
The option c is the correct answer.

In Albizzia, vegetative propagation take place with the help of

  1. Fasciculated tuberous roots

  2. Epiphyllous buds

  3. Subaerial branches

  4. Nonfleshy roots


Correct Option: D
Explanation:

Albizia belongs to family fabaceae. In Albizzia, vegetative propagation take place with the help of nonfleshy roots. The non fleshy roots develop adventitious buds which grow to form new plants. 

Fasciculated tuberous roots are swollen to store food. It occurs as a clusters at the base of the stem. It is found in dhalia.
Epiphyllous buds developed on leaves of shoots. It is used for vegetative propagation in sunflower.
Subaerial branches are used for vegetative propagation in runners, stolon etc.
So, the correct answer is option D.