Tag: importance and classification of angiosperms

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

Which of the following is wrong about xerophytes?

  1. Sunken stomata

  2. Small spiny leaves

  3. Thick cuticle

  4. Large number of stomata
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Xerophytes

  2. Thalophytes

  3. Halophytes

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

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

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

  1. Pneumatophore

  2. Vivivary

  3. Sunken stomata

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Mangifera indica (Mango)

  2. Leucaena leucocephala (Subabul)

  3. Borassus flabelliformis (Palmyrah palm)

  4. Rosa grandiflora (Rose)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  1. Acacia

  2. Rhizophora / Vallisneria

  3. Euphorbia

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

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

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

Development of microsporangium in angiosperms and gymnosperms is of.

  1. Eusporangiate type

  2. Leptosporangiate type

  3. Monosporic type

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

In angiosperms and gymnosperms, the microsporangium develops from a group of archesporial cells, which is characteristic of the eusporangiate type of development.

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

In angiosperms normally after fertilization.

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In angiosperms, the primary endosperm nucleus (PEN) typically divides prior to the division of the zygote. This ensures that the nutritive endosperm tissue is established early to support the subsequent development of the embryo from the zygote.

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

Which one of the following statements is correct?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gymnosperm wood is generally composed of tracheids and lacks vessels. Ray tracheids are often found in gymnosperms but are absent in most dicot woods.