Class 11th |Botany Viva-Voce Question Answers

Q1.Prop roots are seen in banyan tree not in neem tree. Why ?

Ans Prop roots are required for support in hug trees like banyan not the neem tree which is

comaretively.

Q2 Potato is a stem not a root. Why ?

Ans An potato has nodes, internodes and buds which are features of stem not the root.

Q3. Both prop and stilt roots are supportive in function. How do they differ from each

other ?

Ans. Prop roots are strog. hence support huge trees, stilt roots are weak and support shrubs, eg

maize

Q4.What is tap root?

Ans. The root which arise from radicle is called a tap root.

Q5 What are adventitious roots ?

Ans. The roots which arise from any plant part other than radicle are called adventitious roots.

Q6.Which types of roots are found in Dahlia and Asparagus ?

Ans. Fascieulated adventitious roots.

Q7. What is the diference between roots of Dahlia and Asparagus ?

Ans. In Dahila the roots lie at the base of the stem, while in Asparagus clustered roots become fleshy

at intervals and not exactly at the base.

Q8. Which types of roots are found in Trapa and Tinospora?

Ans. Assimilatory adventitious roots.

Q9. What is the difference between roots of Trapa and Tinospora?

Ans. In Trapa, the green assimilatory roots are finely dissected and are submerged like other roots

While, in Thinospora, these roots arise from the stem nodes during the rainy seasons and shrivel

during drought.

Q10. Why there are no prop roots in Neem tree like Banyan tree ?

Ans. Prop roots are required for support in huge trees like Banyan. Neem tree is comparatively small

hence do not have prop roots.

Q11. Both prop and stilt roots are supportive in funetion. How do they difference from

each other ?

Ans. Prop roots are strong and arise from heavy, horizontal aerial branches of main stem while stilt

roots develop from the basal node of the stem.

Q.12. Carrots, radishes, and turnips are quite similar in structure and function. What do we

call these structures and what is their main function?

Ans. They are modified tap roots and their main function is storage of food.

Q.13. What is stem ?

Ans. The stem is the main trunk of a plant. Buds and shoots develop on stems.

Q.14. What are the two main types of stems?

Ans. Green stem and woody stem.

Q.15. What are nodes and internodes?

Ans. Nodes are places on the stem where buds form. Internodes are the segments of the stem between

nodes.

Q.16. What is the difference between rhizome and stolons ?

Ans. The primary difference between rhizomes and stolons is the location of the stems. Rhizomes are

located below the soil surface while stolons are located above the solid surface.

Q.17. What is the difference between the terminal and axillary bud of an onion?

Ans. Terminal bud produce flowers while axillary bud produces green leaves respectively.

Q.18. Which types of modified stem is found in Ruscus and Asparagus?

Ans. Cladode.

Q19. What is the difference between cladode of Ruseus and Aaparagus?

Ans. In Ruscus, the cladodes are leaf like bearing a floral oud in the middle wihile in Asparagus, the cladodes are slightly flattened and fleshy and develop in clusters in the axils of scale leaves.

Q.20. What is an onion ?

Ans. Onion in a modifled stem ie, Bulb Which is composed of dosely packed modified fleshy leaves.

Q21. What are leaves ?

Ans. Leaves are lateral outgrowths from the stem

.

Q22. What is the main function of leaves?

Ans. The main function of leaves is food production of plant.

Q23. Why are leaves so important to a plant?

Ans. Laves are responsible for photosynithes

.

Q24. What purpose does the venation serve for plant?

Ans. Venation serve the purpose the distribution of materials and provide rigidity to the lamina.

Q.25. Name two main types of leaf ?

Ans. Simple and compound.

Q.26. Why the scale leaves of ginger are brown ?

Ans. Because they do not have chlorophyll.

Q.27. What it the role of leaf spines of cactus ?

Ans. They reduce the surface are of leaf and the loss of water through the stomata in desert plants.

Q.28. How a plant's stem can protect against gprazing?

Ans. Stem provides protection against grazing animals when modified into thorns (e g Duranta) or bears prickels (e.g Rose).

Q29.How is phyiloclade helpful to a plant ?

Ans .Formation of phyllociade as in Opuntia is a mechanism to take over function of leaf and to 

reduce transpiration.

Q.30. How an underground stem can be differentiated from a root?

Ans. An underground sem lacke root cap and root  hair but possesnes terminal bud, nodes and 

internodes, scale leaves and axillary buds in the axils of scale leaves

Q.31 What is a phyllode and how is it important in reducing transpiration ?

Ans .Phyllode is a modified petiole and a part of rachis which become flat to take over the function

 of leaf lamina as the latter is absent. Absence of lamina enables the plant to cut down the 

transpiration.

Q.32. What are insectivorous plants?

Ans. These are plants which have devices to catch insets and digesting them  to obtain nitrogenous 

copounds to supplement their  nutrition.

Q.23 Why do insectivorous plants trap insects and digest them ?

Ans Insectivorous plants trap insects to obtain nitrogenous compounds as these plants grow in

soils which are deficient cf nitrogen.

Q.34 What are xerophytes?

Ans Xerophytes are the plants that have adaptations to face xeric coonditions  or can grow successfully

in diry habitats.

Q35. What type of adapiatione help xerophytes  to grow in dry habitats?

Ans Xerophytes have extensively devolped absorptive system  and features that help them

to reduce transpiration.

Q36. Why do some plants modify their leaves or some parts of theirs into tendrils?

Ans.Certain plants with weak stem modify their leaves or some parts of theirs into tendrils so that they can climb some support to expose their photosynthetic organs to sunlight.