Kalmasi

Asked: February 24, 2021In: Class 12 Biology

Mention two strategies evolved to prevent self-pollination in flowers.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 8

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 7

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 6

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

What is meant by monosporic development of female gametophyte?

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 5

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

With a neat, labelled diagram, describe the parts of a typical angiosperm ovule. Answer 4:

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 4

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

Arrange the following terms in the correct developmental sequence: Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 3

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 2

Iditri Bakshi

Asked: February 24, 2021In: Class 12 Biology

Name the parts of an angiosperm flower in which development of male and female gametophyte take place.

NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants Important Board Questions Sexual Reproduction in Flowering Plants NCERT Books for Session 2022-2023 CBSE Board and UP Board Question : 1

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

Answer the following questions: (a) Why does a paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled? (b) Why is diamagnetism, in contrast, almost independent of temperature? (c) If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty? (d) Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields? (e) Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point. (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point.) Why? (f ) Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a ferromagnet?

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.16 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 5 Question 16

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A short bar magnet of magnetic moment 5.25 × 10⁻² J T⁻¹ is placed with its axis perpendicular to the earth’s field direction. At what distance from the centre of the magnet, the resultant field is inclined at 45º with earth’s field on (a) its normal bisector and (b) its axis. Magnitude of the earth’s field at the place is given to be 0.42 G. Ignore the length of the magnet in comparison to the distances involved.

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.15 NCERT Solutions for Class 12 Physics Chapter 5 Question 15

Kalmasi

Mention two strategies evolved to prevent self-pollination in flowers.

What are chasmogamous flowers? Can cross-pollination occur in cleistogamous flowers? Give reasons for your answer.

With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.

What is meant by monosporic development of female gametophyte?

With a neat, labelled diagram, describe the parts of a typical angiosperm ovule. Answer 4:

Arrange the following terms in the correct developmental sequence: Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structures formed at the end of these two events.

Name the parts of an angiosperm flower in which development of male and female gametophyte take place.

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