Tag: extreme adaptations

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Questions Related to extreme adaptations

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

In submerged hydrophytes, the stems are extremely weak due to

  1. Absence of phloem

  2. Absence of xylem

  3. Presence of aerenchyma

  4. Poor development of xylem and mechanical tissue
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

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

Finely dissected leaves occur in

  1. Free floating plants

  2. Rooted floating leaved plants

  3. Submerged plants

  4. Emerged plants
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'
Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Which do not have stomata?

  1. Submerged hydrophytes

  2. Hygrophytes

  3. Mesophytes

  4. Xerophytes
Reveal answer Fill a bubble to check yourself
A Correct answer
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’.

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

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

  1. Large leaves

  2. Presence of aerenchyma

  3. Weak root system

  4. Roots with root pocket
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. <p>Nymphaea</p>

  2. Coconut

  3. Onion

  4. Litchi
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Stem of submerged hydrophytes is soft and weak, because of

  1. Absence of phloem

  2. Absence of stomata

  3. Absence of xylem

  4. Feebly developed supporting tissue and xylem
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Submerged hydrophytes live entirely underwater, so they do not need rigid mechanical tissues for support because the surrounding water provides buoyancy. Consequently, their xylem and supporting tissues are poorly developed.