Q. No.Which among the following extend longitudinally to become pollen sac?
(1) Microsporangia
(2) Filament of anther
(3) Tapetum
(4) Endothecium
All of the following statements are correct except:
(1) The proximal end of the filament is attached to the thalamus or the petal of the flower.
(2) The anther is a four-sided structure consisting of four microsporangia, two in each lobe.
(3) The number and length of stamens are variable in flowers of different species.
(4) In a longitudinal section, a typical microsporangium appears near circular in outline.
A, B, C and D in the following diagram respectively are:
(1) Epidermis, endothecium, middle layers, tapetum
(2) Epidermis, middle layers, PMC, tapetum
(3) Endothecium, middle layers, microspore mother cells, tapetum
(4) Epidermis, middle layers, tapetum, PMC
Which among the following is not a characteristic feature of sporopollenin?
(1) Sporopollenin is one of the most resistant organic material known.
(2) It can withstand high pressures.
(3) No enzyme that degrades sporopollenin is known.
(4) The exine exhibits a fascinating array of patterns and designs.
The above diagram shows some stages in microgametogenesis. Identify A, Band C:
A B C
(1) Symmetric spindle Generative cell Vegetative cell
(2) Symmetric spindle Vegetative cell Generative cell
(3) Asymmetric spindle Vegetative cell Generative cell
(4) Asymmetric spindle Generative cell Vegetative cell
Which of the following statements is false?
- Pollen grains represents male gametophyte
- In angiosperms partially developed male gametophytes are pollinated
- Generative cell is siponogenous while vegetative cell is spermatogenous
- Formation and differentiation of pollen grains is called microsporogenesis
- Hay fever is a pollen allergy
- Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
- Pollen grains are poor in nutrients.
(a) I and VII (b) III and VII (c) IV and V (d) VI and VII
Self-incompatibility:
I. Is a device to prevent inbreeding
II. Provides a biochemical block to self-fertilization.
III. Ensures cross-fertilization.
IV. Is governed by pollen-pistil interaction
V. Is governed by series of multiple alleles.
VI. Prevents self pollen (from the same flower or other flowers of the same plant) from fertilizing the ovules inhibiting pollen germination or pollen tube growth in the pistil.
(1) All are correct
(2) All are wrong
(3) Only I, II, III are correct
(4) IV and V are wrong
Which of the following is false?
I. Endosperm formation starts prior to first division of zygote
II. Angiospermic endosperm is mostly 3N while gymnospermic one is N.
III. The most common type of endosperm is nuclear.
IV. Coconut has both liquid nuclear (multinucleate) and cellular endosperm.
V. Milky water of green tender coconut is liquid female gametophyte.
(1) I and II only
(2) III only
(3) V only
(4) II only
Diagram given below shows stages in embryogenesis in a typical dicot (Capsella). Identify structures A to D respectively:
(a) Suspensor, Radicle, Plumule, Cotyledons
(b) Hypophysis, Radicle, Plumule, Cotyledons
(c) Suspensor, Plumule, Radicle, Cotyledons
(d) Suspensor, Radicule, Plumule, Hypocotyls
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