In which of the following gametophyte is not independent free-living?
Funaria
Marchantia
Pteris
Pteris
D.
Pteris
Gametophyte is phase of life cycle in which the gametes, i.e. egg and sperm are produced. In bryophytes (Funaria and Marchantia) fertilisation is dependent on water for the transfer of sperm to the egg. The gametophyte are fetilized outside the body. Therefore, they have independent free-living gametophyte.
In this respect Pteridophyte are similar to bryophytes i.e they still have free-living gametophytes. Pinaceae (Pinus) has well developed gametophyte in which sperm cells are fertilised with egg cell within the ovule. Hence, pinus is the correct option.
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
Select the correct matching in the following pairs
Smooth ER — Oxidation of phospholipids
Smooth ER — Synthesis of lipids
Rough ER — Synthesis of glycogen
Rough ER — Synthesis of glycogen
Which one of the following statements is wrong?
Algin and carrageenian are products of algae.
Agar-agar is obtained from Gelidium and Gracilaria
Chlorella and Spirulina are used as space food
Chlorella and Spirulina are used as space food
The chromosomes in which centromere is situated close to one end are
metacentric
acrocentric
telocentric
telocentric
The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are
cristate
grana
stroma lamellae
stroma lamellae
