Tag: internal structure of stem(dicot and monocot)

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

Oldest part of phloem in a dicot stem is situated just.

  1. Outside vascular cambium

  2. Inner to primary cortex

  3. Inner to vascular cambium

  4. Between periderm and primary cortex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In dicot stem during secondary growth, the oldest part of xylem situated towards outer to the medulla and oldest phloem is situated just towards inner to the primary cortex.

So, the correct option is ‘Inner to primary cortex’.

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

The endarch condition is characteristic of

  1. Root

  2. Stem

  3. Leaves

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

A. Root – protoxylem is towards the pericycle and metaxylem is towards the medulla. It is called Exarch.

B. Stem – protoxylem is towards the medulla and metaxylem is towards the pericycle. It is called Endarch.

C. Leaves – the position of protoxylem and metaxylem is not specified.

D. Petiole – the position of protoxylem and metaxylem is not specified.

So, the correct option is ‘stem’.

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

In dicot stem, the pericycle is?

  1. Single layered

  2. Multilayered

  3. Two layered

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

Pericycle is the outer most part of the stele. In dicot, stem pericycle is, sclerenchymatous, discontinuous, multilayered and present in the form of patches over the vascular bundles.

So, the correct option is ‘Multilayered’.

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

Annual rings can be useful for indicating age of the tree

  1. Dicot of equatorial region

  2. Monocot of equatorial region

  3. Dicot of temperate region

  4. Monocot of temperate area
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In dicotyledonous trees, growing in temperate regions, due to maximum seasonal variations two types of secondary xylems are formed, spring or early wood and autumn wood or latewood. These two kinds of wood together form into a ring of wood called annual rings. These annual rings are useful in indicating the age of the trees.

So, the correct option is ‘Dicot of temperate regions’.

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

A T.S. of dicot stem shows

  1. Vascular bundles arranged in a ring

  2. Scattered vascular bundles

  3. Closed vascular bundles

  4. Radial vascular bundles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A.Vascular bundles arranged in a ring – found in T.s. of dicot stem

B.Scattered vascular bundles – found in T.s.of monocot stem

C.Closed vascular bundles – found in T.s.of monocot stem

D.Radial vascular bundles – found in T.s.of dicot and monocot roots.

So, the correct option is ‘Vascular bundles arranged in a ring’.

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

Major function of cortex is?

  1. Conduction of water

  2. Storage of water

  3. Storage of food

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

A. Conduction of water – xylem conducts water.

B.Storage of water – water storage parenchyma

C.Storage of food – cortex stores reserve food materials.

D. Strength – hypodermis and pericycle in dicot stem provides strength.

So, the correct option is ‘Storage of food’.

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

Inner-most layer of cortex is

  1. Pericycle

  2. Endodermis

  3. Cutinised

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

A.Pericycle – outer most part of the stele in roots and dicot stem.

B.Endodermis – innermost part of cortex in roots and dicot stem.

C. Cutinised – The outer walls of stem epidermal cells are cutinized i.e.covered by the cuticle.

D.Suberised – The walls of cork cells are suberized i.e. made up of suberin.

So, the correct option is ‘Endodermis’.

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

Common features between lenticels and hydathodes are

  1. Allow exchange of gases

  2. Always remain closed

  3. There is no regulation of their opening and closing

  4. They occur on the same organ of the plant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The large sized, slightly raised spots present on the surface of cork, in old dicot stems are called Lenticels. These are involved in the exchange of gases.

The small pores, present on the epidermis of grass leaves are called Hydathodes. In this guard cells are immovable. They perform guttation.

So, the correct option is ‘There is no regulation of their opening and closing’.

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

Fascicular cambium of dicot stems is?

  1. Apical meristem

  2. Primary meristem

  3. Secondary meristem

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

A.Apical meristem – meristem present in the apices of plant parts, found in all higher plants.

B.Primary meristem – meristem formed from embryonic tissues or promeristem. eg:Fascicular cambium – found in dicotyledons

C.Secondary meristem – meristem formed by the dedifferentiation of permanent tissues. eg:Inter fascicular cambium, cork cambium- found in dicotyledons

D.Intercalary meristem – meristem present in between permanent tissues, found in monocotyledons

So, the correct option is ‘Primary meristem’.