Home
Class 12
BIOLOGY
[A]: Elongation and division of cells ar...

[A]: Elongation and division of cells are pro- moted by gibberellins.
[R]: Gibberellins increase the formation of hydrolytic enzymes that release energy nec- essary for growth

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

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|59 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|322 Videos

Similar Questions

Explore conceptually related problems

Gibberellin promotes cell division and elongation in

Assertion : Gibberellic acid increases the yield of malt from barley grain. Reason :Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzyme for mobilisation of reserve food.

[A] : No energy can be released in the cell in the absence of mitochondria. [R] : Because all the enzymes of the cell respiration are present in it.

read the following statements w.r.t. growth in living organisms. (a).In plants growth by cell division occurs continuously throughout their lifespan. (b) growth is a defining property of living organism. (c) cell division occurs in certain tissues to replace lost cells. (d) increase in body mass is considered as growth. (e) in majority of higher animals and plants and in unicellular organisms, growth and reproduction are mutually exclusive events. select the correct option.

Which of the following statements regarding fertilization is/are correct ? (i) The acrosome is filled with hydrolytic enzymes which help in dissolving the membrane of the ovum at the time of fertilization. (ii) Vitelline membrane is the first membrane to be faced by sperms while trying to fuse with the ovum . (iii) There must be synchronicity in the release of ovum and entry of sperm for the formation of zygote . (iv) The meiotic division of the secondary oocyte is concluded with the entry of male gamete.

Consider the following steps involved in nodule formation in the root of a legume. (i). Bacteria release chemicals and enzymes. (ii). Bacteria stop dividing and form bacteroides. (iii). Roots secrete chemical atractants. (iv). Formation of infection thread. (v). Formation of nodules. (v). Formation of nodulues. (vi). Division of infected cortical cells. (vii) Curlinig of root hair and degradation of their cell wall. (viii). Infection thread grows along with multiplication of bacteria. Arrange the steps in the right sequence and mark the correct option

Identify the correct statement w.r.t. the given cell A. Concerned with lipid and steroidal hormone synthesis B. Outer non- living rigid structure which gives shape to the cell and protects from mechanical damage and infaction . C. Both lie perpendicular to each other and each has an organisation like the cart wheel . D. Responsible for trapping light energy for the synthesis of sugar. E. Present in cells actively involved in protein synthesis and secretion. F. Spherical structures rich in hydrolytic enzymes.

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: The germination of lettuce seeds is stimulated by red light and i...

    Text Solution

    |

  2. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

    Text Solution

    |

  3. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

    Text Solution

    |

  4. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

    Text Solution

    |

  5. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

    Text Solution

    |

  6. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

    Text Solution

    |

  7. [A]: The water is absorbed by the root and moves into the stem. [R]...

    Text Solution

    |

  8. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

    Text Solution

    |

  9. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

    Text Solution

    |

  10. [A]: The nitrogen content of the plant cannot be detected accurately b...

    Text Solution

    |

  11. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

    Text Solution

    |

  12. [A]: The evolution of molecular oxygen is con- cerned with photosystem...

    Text Solution

    |

  13. [A]: Antitranspirants are material applied to plants for retarding tra...

    Text Solution

    |

  14. Assertion. Calcium deficiency symptoms first appear in the apical regi...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  19. [A]: Rate of transpiration is directly propor- tional to relative humi...

    Text Solution

    |

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

    Text Solution

    |