Who discovered the living cell first time?
Who discovered the living cell first time?
A. Robert brown
B. Robert hooke
C. Rudolf virchow
D. Antoni van leeuwenhoek
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The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?
The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?
A. Increase in enzyme molecule increases the available active sites.
B. This relation is for unlimited time period with unlimited enzyme concentration
C. If the concentration is doubled the rate will become two fold.
D. None of these.There are _________ stomata per square cm of leaf surface in Tobacco plants?
There are _________ stomata per square cm of leaf surface in Tobacco plants?
A. 1200
B. 12000
C. 100,000
D. 1000Which of the following plant group first formed true leaves________________?
Which of the following plant group first formed true leaves________________?
A. Psilopsida
B. Lycopsida
C. Sphenopsida
D. PteropsidaWhich of the following is true about hearts of earthworm?
Which of the following is true about hearts of earthworm?
A. There are 5-7 pairs of heart.
B. They are present between 1-7th segments.
C. They are present lateral to the oesophagus.
D. They pump blood from ventral to dorsal vessel.The one which is a weed killer is___________?
The one which is a weed killer is___________?
A. IAA
B. NAA
C. 2 4-D
D. GAEmpty diatom cells are called___________?
Empty diatom cells are called___________?
A. Raphe
B. Valves
C. Frustule
D. Girdles