Multiple Choice QuestionsMost accepted theory for ascent of sap is
capillary theory
root pressure theory
pulsation theory
transpiration pull
Which of the following is not the feature of gymnosperms?
parallel venation
perennial plants
distinct branches (long and short branches)
xylem with vessels
Which of the following is/ are grouped under phanerogams?
Angiosperms
Gymnosperms
Pteridophytes
Both (a) and (b)
Which of the following theory gives the latest explanation for the closure of stomata?
ABA theory
Munch Theory
Starch glucose theory
Active K+ transport theory
The trisomy for 21st chromosome is called
Down's syndrome
Turner's syndrome
Sickle cell anaemia
Klinfelter's syndrome
A.
Down's syndrome
| Abnormality | Cause | Characteristic |
| Down's Syndrome | Trisomy of 21st chromosome (45 A + XX/ XY) | Mental retardation, prominent head, flattened nasal bridge, open mouth, short stature etc |
| Turner's Syndrome | Non- disjunction of sex chromosome (2n = 45; 44A +XO) | Sterile female, webbed neck, no breast development, no menstruation or egg production |
| Klinefelter's Syndrome | Non- disjunction of sex chromosomes (2n = 47; 44A + XXY) | Sterile male with low IQ, testes underdeveloped. |
| Sickle cell anaemia | Molecular gene mutation of gene HbA | Sickle shaped RBCs, do not transport O2 efficiently |
Which is correctly matched?
Apiculture - Honey bee
Pisciculture - Silk moth
Sericulture - Fish
Aquaculture - Mosquito
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