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Assertion : Water and mineral uptake by ...

Assertion : Water and mineral uptake by root hairs from the soil occure through apoplast until it reaches endodermis
Reason : Casparian strips in endodermis are suberized.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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Which of the following statements is /are true? (i) The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes. (ii) The apoplastic movement occurs from cell to cell through the plasmodesmata (iii) endodermis, is impervious to water because of a band of suberised matrix. (iv) Symplastic movement may be aided by cytoplasmic streaming which occurs in hydrilla leaf and chloroplast.

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defenses, promoting the plant to quickly build a bigger root system to access deep soil moisture. To be effective this phytohormone should be at an early stage of development. What are phytohormones ?

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. Which hormone is synthesized at the shoot - tip of plant body ?

A natural occurring class of plant hormones cytokinins has been found to help increase cotton yields during drought conditions. It has been observed that young cotton seedlings have small root system, making it difficult for them to reach available soil water. Cytokinins assists the young plants in water stress defences, promoting the plant to quickly build a bigger root system to access deep soil mosture. To be effective this phytohormone should be at an early stage of development. "Plant hormones help to co - ordinate growth." Justify the statement by giving three examples.

Assertion. The atmospheric concentration of CO_(2) at which photosynthesis just compensates for resoiration is referred to as CO_(2) compensation point. Reason. CO_(2) -compensation point is reached when the amount of CO_(2) uptake is less than that generated through respiration because the level of CO_(2) is more than that required for achieving CO_(2) -compensation point.

[A]: The downward· movement of minerals through soil is effected by quantity and pH of water. [R]:. Water makes mineral ions available to roots. The lower the pH, greater the leaching power of water.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. Assertion. Calcium deficiency symptoms first appear in the apical regi...

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  2. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

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  3. Assertion : Water and mineral uptake by root hairs from the soil occur...

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  4. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

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  5. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

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  6. [A]: The rate of transpiration is indirectly proportional to RH. [R]...

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  7. [A]: Root cells have lower OP than leaf cells. [R]: Root cells have...

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  8. [A]: Root pressure is largely responsible for ascent of sap in herbace...

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  9. [A]: The nodulated bacteria fix nitrogen in the presence of leg Hb. ...

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  10. [A]: Plants growing under trees show less photosynthesis. [R]: Gree...

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  11. [A]: Chlorophylls usually show red fluorescence though they absorb blu...

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  12. Asserion : Long distance flows of photoassimilates in plants occurs t...

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  13. [A]: Rhoea discolor leaves contain anthocya-nin in epidermal cells [...

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  14. [A]: Ringing/Girdling experiments involved removal of all tissues outs...

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  15. [A]: Action spectra for photosynthesis help to identify the pigments i...

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  16. [A] : C3 & C4 cycle can not occur in the same plant [R] : C3 cycle ...

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  17. [A]: Photosynthesis is an oxidation reduction process. [R]: Electron...

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  18. Assertion. Nitrogen deficiency induced purplish colouration in stems, ...

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  19. Asserotion: C(4) photosynthetic pathway is more efficient than the C(3...

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  20. Assertion. The atmospheric concentration of CO(2) at which photosynthe...

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