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?

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

Self-incompatibility:

(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?

(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

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

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

Which of the following is not correct?
(1) As the seed matures, its water content is reduced and seeds become relatively dry(10-15% moisture by mass)
(2) The seed dormancy is the internal or innate inhibition of generation of normal or viable seeds
(3) Embryo in dormant seed shows higher rate of general metabolic rate
(4) Because of dormancy seeds remain viable for longer period and can be stored

Which of the following statements is false?
(1) Some 2000 years old viable seeds of Pheonix dactylifera were discovered during archaeological excavation of King Herod's palace near Dead Sea
(2) Record of 10,000 years of dormancy of seeds has been estimated in Lupinus arcticus
(3) The number of seeds in each fruit in case of orchid and some parasitic forms like Orobanche and Striga is one
(4) Many fruits have evolved mechanisms for dispersal of seeds

Active research is going on in many laboratories around the world to understand the genetics of apomixis. What is the purpose of such active research?
(1) Hybrid plants are directly formed by apomixis
(2) Apomixis is the method to produce seed without fertilization
(3) To transfer apomictic genes into hybrid varieties which will prevent loss of hybrid vigour with successive years
(4) Apomixis produces genetically different individuals