Ques. 1AIPMT 2010 (Mains)
Examine the figures (A–D) given below and select the right option, in which all the four structures A, B, C and D are identified correctly. [Figure]
- A Offset, B Antheridiophore, C Antipodals, D Oogonium
- A Rhizome, B Sporangiophore, C Polar cell, D Globule
- A Sucker, B Seta, C Megaspore mother cell, D Gemma cup
- A Runner, B Archegoniophore, C Synergid, D Antheridium
Answer
(1) A Offset, B Antheridiophore, C Antipodals, D Oogonium
Solution
A: a short horizontal branch joining two rosettes of the water hyacinth ( Eichhornia) ⇒ Offset.
B: a stalked disc-like male branch of the liverwort Marchantia ⇒ Antheridiophore.
C: the three cells at the chalazal end of the embryo sac (top), opposite the egg apparatus ⇒ Antipodals.
D: the upper oval female sex organ of Chara (the lower round one is the globule) ⇒ Oogonium.
As per NCERT, the antipodals are present at the chalazal end and the egg apparatus at the micropylar end of the embryo sac.
Answer: (1)