Double Fertilisation

Q.

The number of chromosomes involved in double fertilisation of a maize plant are = ?
Given that the diploid chromosome number of maize is 20.

1. 100

2. 40

3. 80

4. 50

Q. Why are oranges called parthenocarpic fruits despite the fact that they have seeds?Is there any difference between parthenocarpy and parthenogenesis?

Q.

Where is an embryo sac found in female reproductive part of flower?

Q. Consider the following statements with respect to angiosperms.
(a) Male sex organ in a flower is the stamen
(b) Anthers following mitosis produce pollen grains
(c) In an embryo sac, the primary endosperm nucleus (PEN) is diploid
(d) After double fertilization, ovules develop into seeds and ovaries into fruits
Of the above statements

1. (c) and (d) are correct
2. (a) and (b) are correct
3. (a) and (c) are correct
4. (a) and (d) are correct
5. (b) and (c) are correct

Q. Define double fertilisation. [1 Mark]

Q. What is double fertilization?
[4 Marks]

Q. During generative fertilisation, a ______ fuses with a _____.

1. Polar nucleus, Secondary nucleus
2. Male gamete, Polar nucleus
3. Male gamete, Female gamete
4. Female gamete, Secondary nucleus

Q. Growth of pollen tube towards the ovule is known as:

1. Geotropism
2. Hydrotropism
3. Chemotropism
4. Phototropism