Tag: importance and classification of angiosperms

Questions Related to importance and classification of angiosperms

Which of the following is wrong about xerophytes?

botany ecological adaptations, succession and ecological services plant adaptation adaptation in plants plant habitat importance and classification of angiosperms

  1. Sunken stomata

  2. Small spiny leaves

  3. Thick cuticle

  4. Large number of stomata

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Correct Option: D
Explanation:

 Xerophytes show structural adaptations to discourage water loss through transpiration and increase water absorption. Such, adaptations include small spiny leaves, thick waxy cuticle on leaf surface, sunken stomata and well developed vascular tissue. Leaves show reduction in number of stomata to cut off transpiration losses of water. Also some succulents show 'Crassulacean Acid Metabolism (CAM)'. Their stomata open only during night.

Thus, the correct answer is option D.

The plants of this group are adapted to live partly in water and partly above substratum and free from water. Name the group.

botany ecological adaptations, succession and ecological services plant adaptation adaptation in plants plant habitat importance and classification of angiosperms

  1. Xerophytes

  2. Thalophytes

  3. Halophytes

  4. Hydrophytes

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Correct Option: C
Explanation:

Halophytes are plants adapted to grow in saline conditions. They grow in mangroves, coastal dunes and marshes. The environmental conditions are high salinity and high level of water. The lower parts of trees are permanently submerged in water and grow pneumatophores for gaseous exchange and respiration. The upper parts of these plants are not submerged and freely exposed to atmosphere.

Which of the following is not an adaptive feature of plants growing in physiologically dry soil?

botany ecological adaptations, succession and ecological services plant adaptation adaptation in plants plant habitat importance and classification of angiosperms

  1. Pneumatophore

  2. Vivivary

  3. Sunken stomata

  4. All of the above

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Correct Option: C
Explanation:

Physiologically dry soil means that water is present in soil but due to high levels of salt, it is not available to plants as plants cannot easily absorb the water present in soil. Such plants are called halophiles, e.g., mangrove plants like Sonnertia, Rhizophora, Avicennia etc. Such plants show several unique features such as presence of pneumatophores and vivipary. Sunken stomata is not shown by mangroves but is shown by xerophytes which grow in physically dry soil. Thus, the correct answer is option C.

One of the following is a social foresting species with multiple utility 

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Mangifera indica (Mango)

  2. Leucaena leucocephala (Subabul)

  3. Borassus flabelliformis (Palmyrah palm)

  4. Rosa grandiflora (Rose)

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Correct Option: B
Explanation:

Leucaena leucocephala (Subabul) is a social foresting species with multiple utility like green manure, biomass production, food for humans, pulpwood for paper industry.

Among the plants listed, point out which one does not fit into ecological group represented by other plants 

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Acacia

  2. Rhizophora / Vallisneria

  3. Euphorbia

  4. Aloe

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Correct Option: B
Explanation:

Acacia, Aloe, Euphorbia are xerophytes plants while Vallisneria is hydrophyte and Rhizophora belongs to the halophyte plant group.

Development of microsporangium in angiosperms and gymnosperms is of.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Eusporangiate type

  2. Leptosporangiate type

  3. Monosporic type

  4. Tetrasporic type

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Correct Option: A

In angiosperms normally after fertilization.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. The zygote divides earlier than the primary endosperm nucleus

  2. The primary endosperm nucleus divides earlier than the zygote

  3. Both the zygote and primary endosperm nuclei divide simultaneously

  4. Both the zygote and primary endosperm nuclei undergo a resting period

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Correct Option: A

Which of the following Angiosperm families possess vessels in the wood?
a. Magnoliaceae
b. Degeneriaceae
c. Winteraceae
d. Annonaceae
Select the correct answer.

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. $1, 2$ and $3$

  2. $1, 3$ and $4$

  3. $1, 2$ and $4$

  4. $2$ and $4$

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Correct Option: A

Which one of the following statements is correct?

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. In the wood of dicots, ray tracheids are absent

  2. In the wood of gymnosperms, ray parenchyma is absent

  3. In most commercially important dicot woods, fibers are absent

  4. In the wood of all gymnosperms, vessels are absent

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Correct Option: A

Gnetum resembles angiosperms in showing which one of the following types of female gametophyte development?

botany taxonomy and systematic botany importance and classification of angiosperms plant adaptation adaptation in plants uses of angiosperms classification of angiosperms

  1. Monophonic

  2. Bishopric

  3. Endymion

  4. Tetrasporic

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Correct Option: A