Tag: morphology of leaf

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Questions Related to morphology of leaf

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In a floating leaved plants, stomata occur on

  1. Lower surface

  2. Upper surface

  3. Both of (A) and (B)

  4. Absent
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stoma (plural stomata) is a pore, found in the epidermis of leaves, stems and other organs that is used to control gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening.
Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. Monocotyledons, on the other hand, usually have the same number of stomata on the two epidermis.
In plants with floating leaves, stomata may be found only on the upper epidermis and submerged leaves may lack stomata entirely.
Thus, the correct answer is option B. 

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In a plant where the stomata are absent, some gaseous exchange still takes place through

  1. Aerenchyma

  2. Trichomes

  3. Pneumatophores

  4. Lenticels
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants.
It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. 
Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Which one of the following statement is correct?

  1. Offspring produced by the asexual reproduction are called clone

  2. Microscopic, motile asexual reproductive structures are called zoospores

  3. In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem

  4. Water hyacinth growing in the standing water drains oxygen from water that leads to the death of fishes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Potato, banana, ginger grow from the axillary buds of nodes. Axiallary bud develops from the axillary part of leaf.  These buds can expand to form shoots which grow on to make a whole plant or fruits.

So, the correct option is 'In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem'.

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

A leaf which possesses stomata exclusively its upper side is called as

  1. Oat type

  2. Mulberry type

  3. Lotus type

  4. Cactus type
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A leaf which possesses stomata exclusively its upper side is called as lotus type. Aquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or macrophytes. These plants require special adaptations for living submerged in water or at the water's surface. The most common adaptation is aerenchyma, but floating leaves and finely dissected leaves are also common.
Thus, the correct answer is option C.

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Ochreate stipules occur in leafy vegetable

  1. <p> Amaranthus</p>

  2. <p> Mentha</p>

  3. <p> Platanus</p>

  4. <p> Rumex</p>
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are different types of stipules present in plants such as lateral, ventral, scaly, intrapetiolar, interpetiolar, ochreate, spinous, tendrillar. In ochreate, the stipules are in the form of a tubular sheath around the internode. These are seen in leafy vegetables like Rumex and Polygonum. Foliaceous stipules occur in Lathyrus aphaca. Tendrillar stipules occur in Smilax. Thus, the correct answer is 'Rumex.

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In Nelumbium, Victoria, Tropaeolum the leaf blade is

  1. Peltate

  2. Centric

  3. Unifacial

  4. Ligulate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In peltate leaf, the leaf blades are deeply lobed. In this, the petiole is attached to the middle of the adaxial side of the leaf. Examples of leaves having peltate leaf blade include Nelumbium, Victoria, Tropaeolum. In this, the petiole is attached to the surface of lamina. Thus, the correct answer is 'Peltate.'

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

A swollen leaf base is called ________.

  1. Pulvinus

  2. Amplexicaul

  3. Winged

  4. Sheathing leaf base
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A swollen leaf base is called as Pulvinus. This type of leaves are seen in Fabaceae family. The swelling results due to change in the turgor pressure. Night closure movement of legume leaves shows this pulvinar movement. The pulvinus protects the young axillary bud.

Thus, the correct answer is 'Pulvinus.'

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Pulvinate leaf base is found in

  1. <p>Lycopersicum</p>

  2. <p>Trifolium</p>

  3. <p>Nicotiana</p>

  4. <p>Petunia</p>
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pulvinus is a swollen leaf base. Pulvinate leaf base is found in leguminous plants. It is seen in mango leaves. It is seen in Fabaceae family. Example includes Trifolium pratense.

Thus, the correct answer is 'Trifolium.'

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Bombax leaf is

  1. Tripinnate

  2. Unipinnate

  3. Multifoliate

  4. Quadrifoliate

  5. Trifoliate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Compound leaves are of two types, namely pinnately compound leaves and palmately compound leaves. In palmately compound leaf, the leaflets are arranged at the tip of the petiole. It is further divided into 5 types depending upon the number of leaflets present at the tip of the petiole. In unifoliate, there is only one terminal leaflet is attached at the top of petiole. Example includes Citrus. In bifoliate, two leaflets are attached side by side at the terminal end of petiole. Example includes Balanites roxburghii. In trifoliate, three terminal leaflets are attached at the terminal end of petiole. Example includes Aegle marmelos. In quadrifoliate, four leaflets are attached to the tip of petiole. Example includes Paris quadrifolia. In multifoliate, five or more leaflets are present at the tip of petiole in the form of fingers of the palm. Example includes Bombax malabarica.

Thus, the correct answer is 'Multifoliate.'

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

A mature ligule, having a prominent basal portion is called as

  1. Glossopodium

  2. Rhizophore

  3. Trichome

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A ligule is a variously modified extension of the sheath lying at the base of the blade. While this vegetative part of the leaf blade of the family of grasses, is often a vertical membrane present as an outgrowth at the inner junction of the leaf sheath and blade, in heterosporus lycophytes, this is one of the enigmatic structures. The term which means a little tongue is an appendage that is found at the adaxial side of the leaves. Found in mostly Selaginellales and Isoeteles, the mature ligule shows four regions, sheath, glossopodium, main body and apex. The sheath is the base of the ligule which is composed of long tube shaped cells. The glossopodium is found just above the sheath as vaculoted cells.
Therefore, the correct option is A.