Tag: plant adaptation and modification

Questions Related to plant adaptation and modification

Which one of these is not a part of a leaf?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Midrib

  2. Lamina

  3. Leaf Base

  4. Stamen

Show answer
Correct Option: D
Explanation:

A) The midrib is the large strong central vein in the middle of the leaf.
B) The lamina is the broad green part of the leaf in which photosynthesis takes place.
C) Leaf base is the lowermost part of the leaf from where it attaches to stem or branch.
D) Stamen is the male reproductive part present on a flower.
So the correct option is 'Stamen'.

Which of the following varieties of cotton do not attract bollworm?

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

  1. Hairy leaves

  2. Solid stem

  3. Smooth leaved and nector less

  4. High aspartic acid and low $N _2$ content

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Correct Option: A

Heterophylly means 

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

  1. Occurrence of different color of leaves in plant

  2. Occurrence of different size of roots in a plant

  3. Occurrence of more than one type of leaves

  4. All

Show answer
Correct Option: C
Explanation:

Plants with both submerged and floating or emerged leaves show hetrophylly or occurrence of more than one type of leaves. Eg Ranunculus, Aquatilis 

The leaf of Mimosa pudica is

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

  1. Simple

  2. Bifoliate

  3. Bipinnate

  4. Trifoliate

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Correct Option: C
Explanation:

The leaf of Mimosa pudica is bipinnately compound. It contains leaflets arranged in opposite arrangement on the rachis. It has unipnnate leaves instead of single leaflets in the opposite direction on the rachis.

Thus, the correct answer is 'Bipinnate.'

A simple pinnate compound leaf is?

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

  1. Decompound

  2. Unipinnate

  3. Bipinnate and tripinnate

  4. Both B and C

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Correct Option: B

Which one of the following pairs is correctly matched?

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

  1. Tannia- Bixa orellana

  2. Annatto-Cassia auriculata

  3. Indigo-Indigofei caerulea

  4. Cochineal dye- Dactypius coccus

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Correct Option: A

In Opuntia, each areole represents

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

  1. A node

  2. An internode

  3. An apical bud

  4. An accessory bud

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Correct Option: A

Pinnately parallel venation is found in

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

  1. Canna

  2. Grass

  3. Zizyphus

  4. Castor

Show answer
Correct Option: A
Explanation:

Venation is the arrangement of veins on the leaves. It is basically of 2 types, reticulate and parallel. Reticulate venation involves irregular distribution of veins to form a network. Parallel venation involves the veins running parallel to each other. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. In Canna, the venation is pinnately parallel. 

Thus, the correct answer is 'Canna.'

   __________ is an example of pinnate type venation of leaf blade.

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

  1. Cosmos

  2. Castor

  3. Tapioica

  4. Semul

Show answer
Correct Option: A
Explanation:

Venation is the arrangement of veins on the leaves. It is basically of 2 types, pinnate and palmate. In pinnate or unicostate venation, the lamina has a single principal vein or midrib. It produces lateral veins. In palmate or multicostate venation, lamina has more than one principal vein. Castor has palmate type venation of leaf blade. Cosmos is an example of pinnate type venation of leaf blade. Thus, the correct answer is 'Cosmos.'

In common weed Parthenium the leaf is compound

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

  1. Multifoliate

  2. Tripinnate

  3. Decompound

  4. Bipinnate

Show answer
Correct Option: A
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 Parthenium (common weed).

Thus, the correct answer is 'Multifoliate.'