Underground Stem Modifications

Q. In $Citrus$ axillary buds are modified to form thorns. These thorns

1. Are not protective in function
2. Are soft and non woody in nature
3. Protect the plants from browsing animals
4. Are also seen in $Opuntia$

Q.

In which of the following underground stem modifications, food is not stored in the stem?

1. Rhizome

2. Tuber

3. Corm

4. Bulb

Q.

Justify the following statements on the basis of external features

(i) Underground parts of a plant are not always roots

(ii) Flower is a modified shoot

Q.

Lateral roots develop from primordia originated by the division of

1. pericycle cells lying opposite to protoxylem points

2. pericycle cell lying between two protoxylem points

3. endodermal cell lying between two protoxylem points

4. endodermal cells lying opposite to protoxylem points

Q. Give the technical terms for the following a. A sterile stamen. b. Stamens are united in one bunch c. Stamens are attached to Petals​

Q.

Describe modifications of stem with suitable examples

Q. Underground stem modifications are a useful means of

1. For vegetative propagation
2. For food storage
3. For perennation
4. For mechanical support