Home
Class 12
BIOLOGY
A: certain proteins of pollen orgin iden...

A: certain proteins of pollen orgin identifies the compatible stigam
r: Complatibility protiens are found located in ektexine

A

if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark

B

if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark

C

if assertion is true statement but reason is false then mark

D

if both assertion and reason are flase statements then mark

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • SEXUAL REPRODUCTION IN FLOWERING PLANTS

    AAKASH INSTITUTE|Exercise Assignment (SECTION C)|90 Videos

  • RESPIRATION IN PLANTS

    AAKASH INSTITUTE|Exercise Assignment (Section D)|10 Videos

  • STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION

    AAKASH INSTITUTE|Exercise Assignment (Section - D)|10 Videos

Similar Questions

Explore conceptually related problems

[A] : Histone proteins are synthesized during S phase . [R] : Histone proteins are found associated with DNA to form beed like nucleosomes .

Joseph Bros. was a firm manufacturing jute lamp shades. It used left over jute pieces from various jute factories to manufacture economical lamp shades which are supplied to various hotels to nearby towns. It employs men and women from nearby villages as workers for creating good lamp shade designs. Joseph Bros. is not able to meet its targets Namish, the supervisor of the company was told to analyse the reasons for the poor performance. Namish found following problems and suggested certain solution in the working of the business. the number existing workers were overburdened. the firm decided to search for new workers and it asked the present employees to introduce candidtates or recommend their friends and relatives to the firm. this enabled the firm in "putting people to jobs" and assured attainment of objectives according to plans. (a) Identify the function of management being performed by the firm in the above situation. (b) Name the concept and its source used by the firm to attract more workers for the firm.

The potential energy of gas molecules in a certain certral field depends on the distance r from the field's centre as u( r) = ar^ , where a is a positive constant. The gas temperature is T , the concentration of molecules at the centre of the field is n_0 Find : (a) the number of molecules located at the distances between r and r + dr from the centre of the field , (b) the most probable distance separating the molecules from the centre of the field , ( c) the fraction of molecules located in the spherical layer between r and r + dr , (d) how many times the concentration of molecules in the centre of the field will change if the temperature decreases eta times.

P. Epithelium A is commonly found in ducts of glands and tubular parts of the nephron. Q. Epithelium B is found in the inner surface of hollow organs like bronchioles and fallopian tubes. R. Epithelium C provides protection against chemical and mechanical stress. Identify the above-mentioned epithelium.

In a certain electronic transition in the Hydrogen atom from an initial state i to a final state the difference in the orbit radius ( r_i-r_f) is seven times the first Bohr radius. Identify the transition

[A] : Keratin is one of a group of fibrous in- soluble proteins (scelero proteins) found in ectodermal cells of animals, as in hair, horns and nails. Leather is almost pure keratin. [R]: Cornification is a process occurring in vertebrate epidermis and epidermal struc- tures in which keratin replaces the cytoplasm of a cell.

A conducting ring of mass m and radius r has a weightless conducting rod PQ of length 2r and resistance 2R attached to it along its diametre. It is pivoted at its centre C with its plane vertical, and two blocks of mass m and 2m are suspended by means of a light inextensible string passing over it as shown in Fig. The ring is free to rotate about C and the system is placed in magnetic field B (into the plane of the ring). A circuit is now complete by connecting the ring at A and C to a battery of emf V. It is found that for certain value of V , the system remains static. The value of V can be related with m, B and r as

A conducting ring of mass m and radius r has a weightless conducting rod PQ of length 2r and resistance 2R attached to it along its diametre. It is pivoted at its centre C with its plane vertical, and two blocks of mass m and 2m are suspended by means of a light inextensible string passing over it as shown in Fig. The ring is free to rotate about C and the system is placed in magnetic field B (into the plane of the ring). A circuit is now complete by connecting the ring at A and C to a battery of emf V. It is found that for certain value of V , the system remains static. In static condition, find the current through rod PC.

A conducting ring of mass m and radius r has a weightless conducting rod PQ of length 2r and resistance 2R attached to it along its diametre. It is pivoted at its centre C with its plane vertical, and two blocks of mass m and 2m are suspended by means of a light inextensible string passing over it as shown in Fig. The ring is free to rotate about C and the system is placed in magnetic field B (into the plane of the ring). A circuit is now complete by connecting the ring at A and C to a battery of emf V. It is found that for certain value of V , the system remains static. Net torque applied by the tension in strings can be related as

AAKASH INSTITUTE-SEXUAL REPRODUCTION IN FLOWERING PLANTS -Assignment (SECTION D)
  1. A: Each cell fo the sporogenous tissue is capable of giving rise to a ...

    Text Solution

    |

  2. A: In sporoderm pecitocellulosic layer is surrounded by sproropolleni...

    Text Solution

    |

  3. A: The gerative cell comes to lie freely in the cytoplasm of the tube ...

    Text Solution

    |

  4. A: Restitutional nucleus can be observed in endothecium cells R: End...

    Text Solution

    |

  5. A: chalazal vacuole is present in the help cell of embryo sac R: Pol...

    Text Solution

    |

  6. A: Formatin of mature male gametophyte requires one meiotic and one mi...

    Text Solution

    |

  7. A: filiform apparauts guides the pollen tube into the synergids R: I...

    Text Solution

    |

  8. A: Geitonogamy helps in maintaining homozygosity and superiority of t...

    Text Solution

    |

  9. A: Initial growth of pollen tube takes places on expenditure of food p...

    Text Solution

    |

  10. A: Eight cells of octant stage in dicot embryogeny are made by 2 verti...

    Text Solution

    |

  11. A: Triple fusion is associated with the sexual reproduction inall sper...

    Text Solution

    |

  12. A: Anatropous ovule is resupinate ovule R: The body of ovule is comp...

    Text Solution

    |

  13. A: More than one pollen tubes can enter an embryo sac R: Double fert...

    Text Solution

    |

  14. A: hybird seed have to eb produced every year because seeds collected ...

    Text Solution

    |

  15. A: Growth of male gametophyte is completed over the female reproductiv...

    Text Solution

    |

  16. A: certain proteins of pollen orgin identifies the compatible stigam ...

    Text Solution

    |

  17. A: Tetrapid gametophyte can be produced form tetraploid sporophyte by...

    Text Solution

    |

  18. A: continued self pollination checks inbreeding depression R: pollen...

    Text Solution

    |

  19. A: Complete radicle is not produced by hypobasal tier of octant embryo...

    Text Solution

    |

  20. A: Apomicitic embryo is asexual mode of reproduction R: it prevents ...

    Text Solution

    |