Which of the following is necessary for seed formation in angiosperm?

1. The fully formed male gametophyte of angiosperms contains
(A) one generative cell, one tube cell and one body cell.
(B) one generative cell, one tube cell and one stalk cell.
(C) one tube nucleus, one vegetative cell and one generative cell.
(D) one vegetative nucleus, and two male gametes.
Ans: (d)

2. Which of the following involves comparatively greater wastage of pollen?
(A) Chiropterophily.
(B) Anemophily.
(C) Entomophily.
(D) Ornithophily.
Ans: (B)

3. If the endosperm cells of an angiosperm seed sre pentaploid, then such a seed may have been formed by which of the following parents?
(A) Triploid female and diploid male.
(B) Diploid male and tetraploid female.
(C) Both parents tetraploid.
(D) Triploid male and diploid female.
Ans: (b)

4. The nucellus in the ovule is often called
(A) megagametophyte.
(B) megasporangium.
(C) megasporophyte.
(D) female sporogenous tissue.
Ans: (B)

5. Asexual reproduction differs from sexual reproduction as
(A) it does not involve genetic recombination
(B) it does not involve meiosis and gametic unio
(C) it produces clone
(D) all of these
Ans: (D)

6. The continued existence of any race can be basically attributed to the
(A) reprodution
(B) domestication
(C) conservation
(D) None of these
Ans: (a)

7. Which of the following is not concerning pollination?
(A) Syngamy
(B) Autogamy
(C) Allogamy
(D) Geitonogamy
Ans (a)

8. In angiosperms, meiosis occurs at the time of
(A) formation of gametes
(B) Change over generation from sporophyte to gametophyte
(C) formation of ovules
(D) formation of anthers
Ans: (b)

9. The point of attachment of the cotyledons on the tigellum is
(A) above the hypocotyl
(B) below the epicotyl
(C) called first node
(D) as stated in each of these
Ans: (d)

10. After fertilization synergids and antipodal cells form____.
(A) Oospore
(B) Endosperm
(C) Embryo
(D) Degenerates
Ans (d)

11. The process of fusion of male gamete with the polar nuclei is known as _____.
(A) Fertilization
(B) Triple fusion
(C) Syngamy
(D) None
Ans: (b)

12. Palynology deals with study of
(A) DNA
(B) Chromosomes
(C) Pollen grains
(D) Flowers
Ans: (c)

13. How many pollen mother cells should undergo meiotic division to produce 64 pollen grains?
(A) 64
(B) 32
(C) 16
(D) 8
Ans (c)

14. In a fully developed male gametophyte the number of nuclei is
(A) One
(B) Two
(C) Three
(D) Four
Ans (c)

15. The mature anther wall comprises an epidermis followed by a layer of radially elongated cells with fibrous bands of callose called endothelium whose function is
(A) Nutrition
(B) Protection
(C) Mechanical
(D) Dehiscence
Ans (d)

16. If an endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in each cell of the root will be
(A) 8
(B) 4
(C) 16
(D) 24
Ans (c)

17. Which of the following is necessary for seed formation in angiosperm?
(A) Ovule
(B) Pollination
(C) Double fertilization
(D) All the above
Ans (d)

18. Anthesis is
(A) Elongation of pollen tube is style
(B) Emergence of anthers from corolla tube
(C) Dehiscence of anthers
(D) The first opening of a flower
Ans (c)

19. Commonly in a mature fertilized ovule n, 2n and 3n condition is respectively found in
(A) Antipodals, synergids and integuments
(B) Egg, nucellus and endosperm
(C) Antipodals, zygote and endosperm
(D) Endosperm, nucellus and egg
Ans (c)

20. Karyogamy is
(A) Fusion of zoospores
(B) Fusion of cytoplasm
(C) Fusion of spores
(D) Fusion of gametic nuclei
Ans: (d)