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Q. No.Identify the correct statement(s) regarding the modifications seen in stems:
| I: | Stem tendrils develop from axillary buds and help plants, such as pea, to climb |
| II: | Opuntia modifies its stems into flattened structures to protect itself from browsing animals |
| III: | Underground stems of some plants such as grass and strawberry spread to new niches and when older plants die, new plants are formed. |
| 1. | I, II, and III | 2. | Only II and III |
| 3. | Only III | 4. | Only I and III |
Subtopic: Â Modifications of Stem |
Level 3: 35%-60%
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Identify the correct set of statements:
| (a) | The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea. |
| (b) | Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin. |
| (c) | Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves. |
| (d) | Rhizophora shows vertically upward growing roots that help to get oxygen for respiration. |
| (e) | Subaerially growing stems in grasses and strawberry help in vegetative propagation. |
Choose the correct answer from the options given below:
1. (a), (b), (d), and (e) only
2. (b), (c) only
3. (a), (d) only
4. (b), (c), (d) and (e) only
Subtopic: Â Modifications of Stem |
 66%
Level 2: 60%+
NEET - 2022
Hints
Which of the following is not a modification of the root?
A. Turnip
B. Potato
C. Carrot
D. Sweet potato
E. Zaminkand
Choose the correct answer from the options given below:
1. A & C only
2. B, D & E only
3. B & E only
4. D & E only
A. Turnip
B. Potato
C. Carrot
D. Sweet potato
E. Zaminkand
Choose the correct answer from the options given below:
1. A & C only
2. B, D & E only
3. B & E only
4. D & E only
Subtopic: Â Modification of Roots |Â Modifications of Stem |
 76%
Level 2: 60%+
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Which of the following statement is not correct?
| 1. | Rhizome is a condensed form of stem. |
| 2. | The apical bud in rhizome always remains above the ground. |
| 3. | The rhizome is aerial with no distinct nodes and internodes. |
| 4. | The rhizome is thick, prostrate and branched. |
Subtopic: Â Modifications of Stem |
 54%
Level 3: 35%-60%
NEET - 2022
Hints
Select the incorrect statement from the following.
1. In Opuntia, modified leaves do not perform photosynthesis
2. Rhizome in Pistia grows horizontally beneath the soil
3. Thorns in plants are modified axillary buds
4. Potato tuber has buds on its nodes
1. In Opuntia, modified leaves do not perform photosynthesis
2. Rhizome in Pistia grows horizontally beneath the soil
3. Thorns in plants are modified axillary buds
4. Potato tuber has buds on its nodes
Subtopic: Â Modifications of Stem |
 53%
Level 3: 35%-60%
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Consider the given two statements:
| Statement I: | Stem tendrils which develop from axillary buds are slender and spirally coiled and help plants to climb such as in Citrus and Bougainvillea. |
| Statement II: | Axillary buds of stems may get modified into woody, straight and pointed thorns found in many plants such as gourds and grapevines. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is incorrect; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Modifications of Stem |
 67%
Level 2: 60%+
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Match each item in COLUMN I with one in COLUMN II and select the correct match from the codes given:
Codes:
| COLUMN I [Modification of plant part] |
COLUMN II [Example] |
||
| A | Leaf spine | P | Pea |
| B | Leaf tendril | Q | Bougainvillea |
| C | Stem tendril | R | Cucumber |
| D | Stem thorn | S | Cactus |
| A | B | C | D | |
| 1. | P | R | Q | S |
| 2. | S | R | P | Q |
| 3. | S | P | R | Q |
| 4. | S | P | Q | R |
Subtopic: Â Modification of Roots |Â Modifications of Stem |
 74%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | Rhizome of ginger has nodes and internodes |
| Reason (R): | Rhizome of ginger is an underground modified stem |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Modifications of Stem |
 67%
Level 2: 60%+
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Given below are two statements:
| Assertion (A): | In Bougainvillea, axillary buds of stems get modified to form thorns. |
| Reason (R): | Thorns in Bougainvillea protect plants from browsing animals. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Modifications of Stem |
Level 3: 35%-60%
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Organ of perennation in potato is modified _____A______ and organ for food storage in sweet potato is modified _______B__________
Select the correct option to fill (A) and (B)
Select the correct option to fill (A) and (B)
| A | B | |
| 1. | Stem | Stem |
| 2. | Root | Root |
| 3. | Stem | Root |
| 4. | Root | Stem |
Subtopic: Â Modification of Roots |Â Modifications of Stem |
 79%
Level 2: 60%+
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