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Biology

Biology
The single membrane surrounding vacuoles in plant cells is known as

Apoplast
Chloroplast
Tonoplast
Symplast

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Biology
Acetylcholine is

Toxin
Vitamin
Enzyme
Chemical transmitter

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Biology
Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to

monocotyledons
gymnosperms
angiosperms
dicotyledons

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Biology
Lederberg and Tatum demonstrated conjugation in the bacteria

1946
1944
1945
1947

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Biology
Which one of the following tissues is responsible for increase of girth in the stem of a plant?

Intercalary meristem
Tracheid
Lateral meristem
Pericycle

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Biology
It is formed by a repeating nucleosome units ,which are closely attached to each other to a continuous fibre.

Chromatin
DNA
Centromere
Chromosome

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