Tag: root, stem, and leaves

Questions Related to root, stem, and leaves

Leaf tip tendrils are present in

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. Smilax

  2. Lathyrus

  3. Pisum

  4. Gloriosa

Show answer
Correct Option: D
Explanation:
Leaf tendrils: In weak-stemmed plants, leaf or a part of leaf gets modified into tendrils i.e., a green coiled threadlike structure which helps in climbing around the support. Gloriosa or Glory Lily has leaf tip modified into tendrils. It is also a type of leaf tendrils.
So,the correct answer is " Gloriosa " .

Spines present on the areoles of Opuntia represent

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. stem

  2. leaves

  3. buds

  4. phyllodes

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Correct Option: B
Explanation:

Areoles are the evolutionary modification in the cacti. These modifications give rise to spines and glochids which are the means of self-defense. These spines effectively cover the cacti. These evolved as abortive branch buds while their spines evolved as vestigial leaves.

So, the correct answer is " leaves".

Which of the following plants parts in garlic onion are edible?

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. Underground stem

  2. Fleshy scale leaves

  3. Tunic

  4. Adventitious roots

Show answer
Correct Option: B
Explanation:

'Fleshy scale leaves' in garlic and onion are edible plant parts.

So the correct answer is 'Fleshy scaly leaves'.

Phyllodes are seen in
I) Nepenthes 
II) Australian acacia
III) Opuntia

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. I only

  2. I and II only

  3. II only

  4. I and III only

Show answer
Correct Option: C
Explanation:
Phyllodes are formed when petioles of some plants become flattened and widened. The petiole of Australian acacia is changed to a planed, leaf-like structure which turns green in color showing photosynthesis. Thus, phyllodes are found in Australian acacia.

So, the correct answer is 'II only'.

The pulvinus in 'Touch-me-not plant' plays an important role in

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. Photosynthesis

  2. leaf fall

  3. Leaf movement

  4. Transpiration

Show answer
Correct Option: C
Explanation:

The leaves close under various other stimuli, such as touching, warming, blowing, or shaking. ... The stimulus can also be transmitted to neighboring leaves. It is not known exactly why Mimosa pudica evolved this trait, but many scientists think that the plant uses its ability to shrink as a defense from herbivores. So, the correct option is "C" (Leaf movement).

In Duranta, axillary buds and in Carrisa the apical bud is modified into stem thorns, what is correct for Ulex? It has 

evs roots and leaves plant adaptation and modification leaves leaf modification root, stem, and leaves

  1. Leaf tendrils and stem spines

  2. Leaf spines

  3. Stem thorns

  4. Both stem thorns as well as leaf spines

Show answer
Correct Option: D
Explanation:

In Duranta, axillary buds and in Carrisa the apical bud is modified into stem thorns, for ulex both stem thorns as well as leaf spines are modified.
Hence, option D is correct.

The bulliform cells of leaves lose their turgidity during excessive _____________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Assimilation

  2. Transpiration

  3. Photosynthesis

  4. Respiration

Show answer
Correct Option: B
Explanation:

In some grasses(isobilateral leaves), on epidermis, there are some larger, thin walled cells called bulliform cells are present, which in dry condition lose water through transpiration and thus the rolling up of leaves occurs, e.g., in Poa, Agropyron, Amophilla, etc.

How much water a mango tree can transprire during its growing season?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. $350 - 750$ liters/ day

  2. $350 - 1750$ liters/ day

  3. $750 - 3500$ liters/ day

  4. $1750 - 3500$ liters/ day

Show answer
Correct Option: A
Explanation:
Mango tree transpire around 100L of water per day during normal season But this transpiration reaches to 350-750 L /day during is a growing season.
So the correct option is' 350 -750liters /day'.

Meaningful girdling (ringing) experiment can not be performed within sugarcane because

(a) its phloem is situated interior to xylem
(b) its stem surface is covered with worry coating
(c) its vascular bundles are not present in a ring
(d) its stem is thin $13$. Guttation is caused by

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration

  2. Osmosis/ DPD

  3. Root pressure

  4. Osmotic pressure

Show answer
Correct Option: C
Explanation:
Guttation is the process of loss of water from the surface of leaves in the form of liquid drops. Hydathodes are the openings through which guttation takes place that are present on the margins of leaves. It occurs when root pressure is high and transpiration is low. 
So the correct answer is 'Root pressure'.

In the leaves of strawberry, water appears to be exuded through leaf margins. This is due to the combination of:
i. Adhesion
ii. Root pressure
iii. Transpiration
iv. Guttation.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. i, ii and iii

  2. ii, iii and iv

  3. i, ii and iv

  4. Only i, & iv

Show answer
Correct Option: C
Explanation:
  • Guttation is the process of loss of water from the surface of leaves in the form of liquid drops. Hydathodes are the openings through which guttation takes place that are present on the margins of leaves.
  • Guttation occurs when root pressure is high and transpiration is low. Guttation is frequently seen occurring at night in herbaceous plants growing under conditions of high soil moisture and high atmospheric humidity.
  • Water rises up in the process due to the property of Adhesion.
So, the correct option is 'i, ii and iv'.