Tag: evs

Questions Related to evs

Which of the following is not a hydrophytic adaptation?

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. waxy layer

  2. Fleshy leaves

  3. Poorly developed xylem

  4. All

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Correct Option: B
Explanation:

Succulent plants stores water in their stems, fleshy leaves, such as the aloe.

So fleshy leaves are not a hydrophytic adaptation.
So, the correct answer is 'fleshy leaves'

Which one of the following has the largest floating leaves?

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Banana

  2. Victoria

  3. Nelumbo

  4. Date Palm

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Correct Option: B
Explanation:

Victoria amazonica is commonly known as Giant Water Lily. They have the lagest floating leaves. They have large floating leaves, up to 3 meter in diameter. The leaves float on the surface of water on a submerged stalk.

Thus, the correct answer is 'Victoria.'

Phycology is the study of

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Plants

  2. Virus

  3. Algae

  4. Bacteria

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Correct Option: A

In submerged hydrophytes, the stems are extremely weak due to

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Absence of phloem

  2. Absence of xylem

  3. Presence of aerenchyma

  4. Poor development of xylem and mechanical tissue

Show answer
Correct Option: D
Explanation:

In submerged hydrophytes, the entire plant body is involved in the absorption of water and these plants not experiences much stress or pressure internally. So in these plants, xylem and mechanical tissues are poorly developed.

So, the correct option is ‘Poor development of xylem and mechanical tissues’.

Finely dissected leaves occur in

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Free floating plants

  2. Rooted floating leaved plants

  3. Submerged plants

  4. Emerged plants

Show answer
Correct Option: C
Explanation:
Finely dissected leaves occur in submerged plants. In submerged plants, the leaves are finely dissected till the midrib. This dissection gives a feather-like appearance. In this, only the stalk of flower remains above the water and rest of the plant is submerged.
Thus, the correct answer is 'Submerged plants.'

Which do not have stomata?

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Submerged hydrophytes

  2. Hygrophytes

  3. Mesophytes

  4. Xerophytes

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Correct Option: A
Explanation:

A.Submerged hydrophytes – plants grow completely in the water, stomata are absent.

B.Hygrophytes – plants grow in wet conditions, stomata are present.

C.Mesophytes – plants grow in average climatic conditions. Stomata are present.

D.Xerophytes – plants grow in dry or arid conditions, sunken stomata are present.

So, the correct option is ‘submerged hydrophytes’.

Which of the following is considered to be the main adaptation for hydrophytes?

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Large leaves

  2. Presence of aerenchyma

  3. Weak root system

  4. Roots with root pocket

Show answer
Correct Option: B
Explanation:

In hydrophytes or aquatic plants, large intercellular air spaces are developed extensively in the parenchyma so as to form a connected system throughout the plant. Such a modified parenchymatous tissue is called aerenchyma. It provides buoyancy to the plants and helps in gaseous exchange also. Thus the correct answer is option B.

________ seed in which reserve food is present in the perisperm.

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Nymphaea

  2. Coconut

  3. Onion

  4. Litchi

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Correct Option: A
Explanation:

A. Nymphaea- Reserve food material in perisperm (Persistant nucellus). Perisperm occurs in the seeds of black pepper, coffee, castor, cardamom, Nymphaea. It is diploid.

B. Coconut- Reserve food material in endosperm.

C. Onion- Reserve food material in endosperm

D. Litchi- Reserve food material in cotyledons.

So, the correct answer is 'Nymphaea'.

Stem of submerged hydrophytes is soft and weak, because of

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Absence of phloem

  2. Absence of stomata

  3. Absence of xylem

  4. Feebly developed supporting tissue and xylem

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Correct Option: D

Submerged hydrophytes have a well developed

evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

  1. Vascular system

  2. Aerenchyma

  3. Root system

  4. Stomatal system

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Correct Option: B