Primary endosperm nucleus (PEN) is formed by the fusion of
1. 2 polar nuclei + 1 synergid cell nucleus
2. 1 polar nucleus + 1 antipodal cell nucleus + 1 synergid cell nucleus
3. 2 polar nuclei + 1 male gamete nucleus
4. 2 antipodal cell nuclei + 1 male gamete nucleus
Identify the parts labelled A, B, C and D in the given figure and select the correct option.
A | B | C | D |
1. Scutellum | Epiblast | Coleoptile | Coleorhiza |
2. Scutellum | Coleorhiza | Coleoptile | Epiblast |
3. Scutellum | Coleoptile | Coleorhiza | Epiblast |
4. Epiblast | Coleoptile | Coleorhiza | Scutellum |
Match column I with column II and select the correct option from the given codes.
Column - I | Column - II | ||
A. | Parthenocarpy | (i) | Seed formation without fertilization |
B. | Polyembryony | (ii) | More than one embryo in same seed |
C. | Apomixis | (iii) | Seedless fruits without fertilization |
D. | Somatic embryogenesis | (iv) | Embryo develops from a somatic cell |
1. A - (iv), B - (ii), C - (iii), D - (i)
2. A - (iii), B - (ii), C - (i), D - (iv)
3. A - (i), B - (iv), C - (iii), D - (ii)
4. A - (ii), B - (iii), C - (i), D - (iv)
The following is the diagram of T.S. of anther. Identify the parts labelled A, B and C.
1. | A - Connective tissue, B - Pollen grains, C - Endothecium |
2. | A - Endothecium, B -Connective tissue, C - Pollen grains |
3. | A - Pollen grains, B - Connective tissue, C - Endothecium |
4. | A - Endothecium, B - Pollen grains, C - Connective tissue |
Which one of the most common embryo sac in flowering plant?
(1) Monosporic, 8 nucleated and 7 celled
(2) Monosporic, 7 celled and 7 nucleated
(3) Bisporic, 8 nucleated and 7 celled
(4) Bisporic, 7 celled and 8 nucleated
The normal type of embryo sac is 8-nucleated and
(1) 8-celled
(2) 7-celled
(3) 6-celled
(4) 5-celled
Embryo sac is
(1) megaspore
(2) microgametophyte
(3) female gametophyte
(4) megasporangium
In some seeds, reminants of nucellus are also presistent. This residual, persistent nucellus is the
(1) pericarp
(2) perisperm
(3) chalazosperm
(4) mesosperm
What is the number of microsporangia in each lobe of an angiosperm anther?
(1) Four
(2) Two
(3) Eight
(4) One
Which among the following extend longitudinally to become pollen sac?
(1) Microsporangia
(2) Filament of anther
(3) Tapetum
(4) Endothecium