Tag: botany

Questions Related to botany

The differentiation of Palisade tissue and spongy parenchyma is found in ______________.

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Isobilateral

  2. Dorsiventral leaves

  3. Both

  4. None

Show answer
Correct Option: B
Explanation:

Dorsiventral leaf i.e. Mesophyll is the ground tissue and it occurs between the two epidermal layers. It is heavily composed of chlorenchyma cells. The mesophyll is differentiated into two regions an upper palisade parenchyma and lower spongy parenchyma. Palisade parenchyma is again composed of two or three layers of elongated and compactly arranged chlorenchyma cells.

Also, the isobilateral leaf has undifferentiated mesophyll.

Therefore, the correct answer is option B.

In dorsiventral leaves

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Upper surface is dark green as compared to lower surface

  2. Both the surfaces are equally green

  3. Lower surface is dark green

  4. Both the surfaces are dark green

Show answer
Correct Option: A
Explanation:

Leaves, in which both surfaces are differentiated are called dorsiventral leaves. In these leaves, palisade parenchyma is present towards the upper epidermis and spongy parenchyma is present towards the lower epidermis. Because of this reason, in dorsiventral leaves, the upper side is dark green in colour and lower side is light green in colour.

So, the correct answer is ‘Upper surface is dark green as compared to the lower surface’.

Spongy parenchyma is arranged in

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. One layer

  2. Loosely arranged

  3. Compactly arranged

  4. Regularly arranged around large cavities

Show answer
Correct Option: B
Explanation:

The parenchyma with loosely arranged cells, present in the mesophyll of leaves is called spongy parenchyma.

So, the correct option is ‘Loosely arranged’

Palisade parenchyma is present on both sides in.

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Nerium

  2. Eucalyptus

  3. Wheat

  4. Both A and B

Show answer
Correct Option: D
Explanation:

In xerophytic leaves, mesophyll is differentiated into palisade and spongy parenchyma. In these leaves, palisade parenchyma is present on both sides. i.e towards upper epidermis and lower epidermis. In the palisade parenchyma cells are cylindrical in shape contains more number of chloroplasts. In spongy parenchyma, cells are oval in shape, loosely arranged, with less number of chloroplasts. 

eg:Nerium, Eucalyptus.
So, the correct option is 'Both A and B'.

Mesophyll is differentiated into palisade and spongy tissue in

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Some monocot leaves

  2. All dorsiventral leaves

  3. All monocot leaves

  4. All isobilateral leaves

Show answer
Correct Option: B
Explanation:

The region present between the upper and lower epidermis of leaves is called mesophyll. It is differentiated into upper palisade and lower spongy parenchyma in dicot leaves or dorsiventral leaves, whereas in monocot leaves or isobilateral leaves, it is undifferentiated and it shows spongy parenchyma.

So, the correct option is ‘All dorsiventral leaves’.

Match the columns and choose the correct option.

I II
(a) Bulliform cells $(1)$ Initiation of lateral roots
(b) Pericycle $(2)$ Root
(c) Endarch xylem $(3)$ Grasses
(d) Exarch Xylem $(4)$ Dicot leaf
(e) Bundle sheath cells $(5)$ Stem
botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. $a-3, b-5, c-4, d-1, e-2$

  2. $a-2, b-5, c-1, d-3, e-4$

  3. $a-2, b-4, c-1, d-3, e-5$

  4. $a-3, b-1, c-5, d-2, e-4$

  5. $a-5, b-4, c-2, d-1, e-3$

Show answer
Correct Option: D
Explanation:

a-bulliform cells                3) Grasses

b)Pericycle                         1) Initiation of lateral roots

c)Endarch xylem                5)stem

d)Exarch xylem                  2)Root

e)Bundle sheath cells       3)Grasses

So, the correct option is ‘a-3, b-1, c-5, d-2, e-4

Match List I with List II and select the correct answer.

List-I List-II
a. Sal $1$. Pinus roxburghii
b. Shisham $2$. Tectona grandis
c. Chir $3$. Dalbergia sisso
d. Teak $4$. Shorea robusta
botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. A-$4$, B-$3$, C-$1$, D-$2$

  2. A-$4$, B-$3$, C-$2$, D-$1$

  3. A-$3$, B-$4$, C-$1$, D-$2$

  4. A-$3$, B-$4$, C-$2$, D-$1$

Show answer
Correct Option: A

The lower surface of leaf will have more number of stomata in a __________.

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Dorsiventral leaf

  2. Isobilateral leaf

  3. Both (a) and (b)

  4. None of these

Show answer
Correct Option: A
Explanation:

Transpiration is the evaporative loss of water by plants. It occurs mainly through the stomata in the leaves. Usually the lower surface of a dorsiventral (often dicotyledonous) leaf has a greater number of stomata while in an isobilateral(often monocotyledonous) leaf. There are almost equal number of stomata on both surfaces.

Dorsiventral leaf has

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. spongy parenchyma on upper side

  2. spongy parenchyma on both sides

  3. palisade parenchyma on lower side

  4. palisade parenchyma on upper side

Show answer
Correct Option: D
Explanation:

Dorsiventral leaves orient themselves at an angle to the main axis and perpendicular to the direction of sunlight. Most dicots have dorsi-ventral leaves that are net-veined, including most trees, bushes, garden plants and wildflowers. Mesophyll is the ground tissue between the upper and lower epidermis. In dorsiventral leaf, it is differentiated into palisade parenchyma and spongy parenchyma. Palisade parenchyma lies towards the upper epidermis and consists of one, two or three layers of elongated cells, densely packed with no intercellular spaces and contains chloroplast

So, the correct option is 'palisade parenchyma on upper side'

Vascular bundles in dicot leaves are

botany internal structure of root, stem and leaf internal structure of monocot leaf internal structure of dicot leaf internal structure of leaf (dicot and monocot)

  1. Conjoint, bicollateral, closed

  2. Radia, open

  3. Conjoint, collateral, closed

  4. Conjoint , collateral, open

Show answer
Correct Option: C
Explanation:

In the vascular bundles of dicot leaves, xylem and phloem are present on same radius and also present side by side. So they are called collateral and conjoint. Cambium is absent between xylem and phloem. So, It is called closed vascular bundle.

So, the correct option is 'Conjoint, collateral, closed'.