The chromosomes in which centromere is situated close to one end are
metacentric
acrocentric
telocentric
telocentric
B.
acrocentric
Acrocentric chromosome has centrosome, which is situated almost closed to an end.
There are 4 types of chromosomes according to location of centromere on chromosome (chromatid arms) as
1. Metacentric X-shaped chromosomes with centromere exactly at the middle of two arms
Chromosomes 1 and 3 are metacentric.
2. Acrocentric When one arm is short and centromere is inner to telomere. It is hard to observe short arm but still it is present.
Chromosome 13, 14, 15, 21 and 22 are acrocentric.
3. Submetacentric: Centromere is sub median, so Arm's length are unequal but observable. Chromosomes 4 and 12 are submetacentric.
4. Telocentric: When centromere is located at the terminal end of the chromatid arm.
Human do not possess telocentric chromosome.
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
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
The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are
cristate
grana
stroma lamellae
stroma lamellae
Which one gives the most valid and recent explanation for stomatal movements?
Transpiration
Potassium influx and efflux
Starch hydrolysis
Starch hydrolysis
In which of the following gametophyte is not independent free-living?
Funaria
Marchantia
Pteris
Pteris
