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

Subtopic:  Stamen: Microsporangium |
 54%
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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.

Subtopic:  Stamen: Male Gametophyte |
 68%
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Megasporangium is equivalent to:

(1) Embryo sac

(2) Ovary

(3) Nucellus

(4) Ovule

Subtopic:  Pistil: Ovule |
 59%
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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

 

Subtopic:  Stamen: Male Gametophyte |
 76%
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Which of the following statements is false?

  1. Pollen grains represents male gametophyte
  2. In angiosperms partially developed male gametophytes are pollinated
  3. Generative cell is siponogenous while vegetative cell is spermatogenous
  4. Formation and differentiation of pollen grains is called microsporogenesis
  5. Hay fever is a pollen allergy
  6. Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
  7. Pollen grains are poor in nutrients.

(a) I and VII          (b) III and VII       (c) IV and V          (d) VI and VII

Subtopic:  Stamen: Male Gametophyte |
 85%
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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

Subtopic:  Pollination & Outbreeding Devices |
 77%
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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

Subtopic:  Endosperm |
 75%
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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

Subtopic:  Embryo |
 79%
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I. No endosperm
II. Endosperm present
III. Cotyledons - thin
IV. Cotyledons – thick
VI. Food is stored in cotyledons
VI. Food is stored in endosperms
Sort out correct points (from I to VI) for (A) - Albuminous and (B) - Exalbuminous seeds:
          A                B                       A                  B
(a) II, III, VI    I, IV, V           (b) I, IV, V         II, III, VI

(c) I, III, V      II, IV, VI         (d) II, IV, VI       I, III, V

Subtopic:  Endosperm | Seed |
 62%
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Which are the external conditions required for seed germination:

(1) Oxygen, carbon dioxide and suitable temperature

(2) Oxygen, light and suitable temperature

(3) Light, moisture and suitable temperature

(4) Oxygen, moisture and suitable temperature

Subtopic:  Seed |
 68%
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