Tag: mineral absorption

Questions Related to mineral absorption

The leaf which produces spores is called

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Sorus

  2. Sporangium

  3. Sporangiophore

  4. Sporophyll

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Correct Option: A

Palisade cells and spongy cells are found in:

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Dicot steam

  2. Monocot leaf :

  3. Monocot root

  4. Dicot lef

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Correct Option: B

Match the following and choose the correct option.

A. Leaves i. Anti-transpirant
B. Seed ii. Transpiration
C. Roots iii. Negative osmotic potential
D. Aspirin iv. Imbibition
E. Plasmolyzed cell v. Absorbtion
botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. A-iii, B-iv, C-I, D-ii

  2. A-i, B-ii, C-iii, D-iv

  3. A-iii, B-ii, C-iv, D-i

  4. A-iii, B-ii, C-i, D-iv

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Correct Option: A

Match List-I with List-II and select the correct answer.

List-I List-II
a. when the leaf is rolled from one margin to the other $1$. Centuplicate
b. When the leaf is rolled from the apex towards the base $2$. Convolute
c. When upper half of the lower half $3$. Criminate
d. When the leaf is folded lengthwise along the midrib $4$. Replicate
botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. A-$1$, B-$2$, C-$3$, D-$4$

  2. A-$2$, B-$1$, C-$4$, D-$3$

  3. A-$3$, B-$2$, C-$1$, D-$4$

  4. A-$2$, B-$3$, C-$4$, D-$1$

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Correct Option: A

Which of the following is not the modification of leaf?

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Tendril in Antigonon

  2. Tendril in Clematis

  3. Tendril in Gloriosa

  4. Tendril in Nepenthes

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Correct Option: A

Which one of the following pairs is correctly matched?

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Pistia - Sciophyte

  2. Lemna - Xerophyte

  3. Rhizophora - Halophyte

  4. Casuarina - Hydophyte

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Correct Option: A

Choose the correct answers from the alternatives given.
One important difference between the anatomy and physiology of roots and leaves is that

botany the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Unlike roots, the xylem vessels in leaves normally transport sap in both directions

  2. A waxy cuticle covers most leaves but is absent in roots

  3. Leaves, but not roots, have ground tissue consisting mainly of parenchyma cells

  4. Phloem always conducts sap away from leaves and toward roots

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Correct Option: B
Explanation:

The leaves are covered with waxy cuticle but roots do not possess any cuticle. Cuticle helps in preventing loss of water from the surface of the leaves. Since roots are present underground immersed in the soil they do not show transpiration and hence no cuticle is present. 

Hence, the correct answer is 'A waxy cuticle covers most leaves but is absent in roots'.

The classical experiments on growth were performed by

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Lamarck and  Boysen Jensen

  2. Boysen Jensen and Darwin

  3. Darwin and Lamarck

  4. Lamarck and Darwin

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Correct Option: B
Explanation:

Charles Darwin and Francis showed  the presence of the phototropic stimulus at the tip of the plant and that the apical region communicates with the cell of elongation zone. The Danish plant physiologist Boysen-Jensen experimentally showed that the apex cells communicate with the the cell of elongation zone via chemical passing down from the tip of the coleoptile. Lamarck gave the theory of inheritance of acquired characters that explains evolution as the inheritance of acquired characters under influence of needs as posed as changing environmental conditions. Thus, the correct answer is option B.

Ultrafiltration theory for permeability of cell membrane was put forth by

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Traube

  2. Ruhland

  3. Sachs

  4. None of the above

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Correct Option: B
Explanation:

W. Ruhland (1912) and Hoffman (1925) put forth the ultrafiltration theory and describe that small pores are found on the membrane of the molecules, which are small in size than pores of the membrane are only passed through membranes.

Meaningful girdling (ringing) experiment cannot be done on sugarcane because

biology the leaf mechanism of absorption mineral absorption significance of transpiration

  1. Phloem is present inside the xylem.

  2. It can not tolerate the injury.

  3. Vascular bundles are scattered.

  4. Plants are very delicate.

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Correct Option: C
Explanation:
  • Monocots have scattered vascular bundles, while dicots have a continuous ring arrangement of vascular bundles. In a dicot stem, after a few years of growth, phloem is present as a single continuous layer or sheet on the outer side as a constituent of bark. 
  • It can be easily removed because it is present as a continuous sheet. In a similar manner phloem cannot be removed in a monocot stem, because of the scattered arrangement, some of the vascular bundles might be present near the surface and some embedded deep inside. 
  • Removing phloem from each of the bundles individually is not possible. The girdling experiment is used to identify the tissue through which food is conducted. In this experiment, a ring of phloem is removed from the woody plant. 
  • Hence girdling experiments cannot be performed on a monocot stem-like sugarcane.