Tag: botany

Questions Related to botany

Excessive aerenchyma tissues in the plants is mainly an adaptation for.

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Xerophytes condition

  2. Hydrolytic condition

  3. Epiphytic condition

  4. Niesophytic condition

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Correct Option: A

The most effective defence of plants against herbivores are

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Morphological

  2. Chemical

  3. Temporal

  4. Developmental

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Correct Option: A
Explanation:

To counter the herbivore attack, plants produce specialized morphological structures or secondary metabolites and proteins that have toxic, repellent effects on the herbivores. Plants confront the herbivores both directly by affecting host plant preference or survival and reproductive success (direct defense), and indirectly through other species such as natural enemies of the insect pests (indirect defense). Direct defenses are mediated by plant characteristics that affect the herbivores biology such as mechanical protection on the surface of the plants (e.g., hairs, trichomes, thorns, spines, and thicker leaves) or production of toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones) that either kill or retard the development of the herbivores.

Submerged hydrophytes have commonly dissected leaves for

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Decreasing surface area

  2. Increasing surface area

  3. Reducing effect of water currents

  4. Both B and C

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Correct Option: D
Explanation:

The submerged leaves are often highly dissected or divided. This has the advantage of creating a very large surface area for absorption and photosynthesis. It also minimises water resistance and hence, potential damage to the leaves since moving water (currents and waves) can be damaging to the leaves of the plant.

In xerophytes, photosynthesis, often occurs through

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Root

  2. Modified stem

  3. Stomata

  4. Scaly leaves

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Correct Option: B
Explanation:

Xerophytes are plants, that have small amount of water or moisture, so they have adaptations that allow them to survive in these harsh conditions. These plants are like cactus and other succulents are typically found in deserts. 

Xerophytes have a shortage of water, so have special adaptive features to store or reduce the loss of water, so that photosynthesis and respiration can be carried out. 
For e.g., in Cacti the leaves have become spines, so therefore photosynthesis occurs in the stem. It has many packed cells in the cortex, that can easily store water and the epidermis has a tick waxy cuticle, that reduces water loss. The cacti can close its stomata during the day decreases water lost and then open it at night to let in $CO _2$ for photosynthesis. This photosynthesis process is called as the CAM photosynthesis.

One of the advantages of growing chilli plants between two rows ofgreen gram plants, is that

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Chilli plants are protected by the shade of dhal plants

  2. Nitrogenous fertiliser prepared by green gram plants can be utilised

    by chilli plants

  3. Chilli plants get water from green gram plants

  4. Dhal plants are protected from pests in the presence of chilli plants

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Correct Option: A

Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?

botany adaptation plant adaptation adaptation in plants plant habitat importance and classification of angiosperms aquatic plant adaptations pollination through water life in water

  1. Prosopis, tree, scrub

  2. Saccharum, grass, forest

  3. Shorea robusta, herb, tropical rain forest

  4. Acacia catechu, tree, coniferous forest

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Correct Option: A

Plants growing in dry habitat are 

botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

  1. Lithophytes

  2. Mesophytes

  3. Hydrophytes

  4. Xerophytes

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Correct Option: D

Which combination of the statements is incorrect for the adaptation in cactus?

botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

  1. The cactus plants store water in their stems which carries out photosynthesis and is covered by the cuticle.

  2. Spines are the modified leaves of the cactus plant. Which reduce the loss of water through transpiration.

  3. The cactus plants have very short roots which cannot properly absorb water from the soil.

  4. The cactus plants lose a huge amount of water through transpiration so they cannot survive in deserts for a long time.

Show answer
Correct Option: C,D
Explanation:

The succulent stem of the cactus plants usually store water and carry out photosynthesis also. The cactus stem contains a tough and waxy outer layer, called cuticle. The cactus plants possess modified leaves shaped like thin spines or thorns that decrease water loss through transpiration. 

The cactus plants contain long roots that efficiently absorb water from the ground. Due to the low transpiration rate, the cactus plants can remain alive in deserts for a longer period of time. 
So, the options C, The cactus plants have very short roots which cannot properly absorb water from the soil and D, The cactus plants lose a huge amount of water through transpiration so they cannot survive in deserts for a long time are incorrect for the adaptation in cactus. 
 

Stomata open at night and close during day in

botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features

  1. Xerophytes

  2. Gametophytes

  3. Mesophytes

  4. Hydrophytes

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Correct Option: A
Explanation:

Stomata in xerophytes open in night and remain close during day to prevent loss of water through transpiration.

"Patther phul" is _______________.

botany ecological adaptations, succession and ecological services extreme adaptations adapting to a habit adaptive features aquatic plant adaptations pollination through water

  1. Lichen

  2. Xerophytic plant

  3. Living stones

  4. Hydrophytic plant

Show answer
Correct Option: B
Explanation:

"Patther phul" or stone flower or rock moss is a xerophytic plant or xerophytic shrub occurring wild on rocky ground( not much water present) As it is a plant which needs very little water it is called a xerophyte and occurs in the region of Gujarat 

So, the correct answer is 'Xerophytic plant'.