Which one of the following is a correct statements?
Pteridophyte gametophyte has a protonemal and leafy stage
In gymnosperms female gametophyte is free-living
Antheridiophores and archegoniophores are present in pteridophytes
Antheridiophores and archegoniophores are present in pteridophytes
D.
Antheridiophores and archegoniophores are present in pteridophytes
Some pteridophytes like Selaginella and Salvinia are heterosporous as they produce two kinds of spores micro (small) spores and macro (large) spores, which germinate and give rise to male and female gametophyte respectively. The female gametophyte in these plants are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos take place within the female gametophyte. This event is the precursor to the seed habit, considered to an important step in evolution.
During gamete formation, the enzyme recombinase participates during
metaphase - I
anaphase-II
prophase-I
prophase-I
The correct sequence of cell organelles during photorespiration is
chloroplast - Golgi bodies - mitochondria
chloroplast-rough endoplasmic reticulum -dictyosomes
chloroplast-mitochondria-peroxisome
chloroplast-mitochondria-peroxisome
Which one of the following does not differ in E.coli and Chlamydomonas?
Ribosomes
Chromosomal organisation
Cell wall
Cell wall
A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
Sympathetic nervous system is activated releasing epinephrine and norepinephrine from adrenal medulla
Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse
Hypothalamus activates the parasympathetic division of brain
Hypothalamus activates the parasympathetic division of brain
Which one of the following is correctly matched?
Passive transport of nutrients - ATP
Apoplast - Plasmodesmata
Potassium-Readily mobilization
Potassium-Readily immobilization
