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142431. The simple microscope was first invented by
A
Purkinje
B
Robert Brown
C
Robert Hooke
D
LeeuwenhoekCorrect Answer: D. Leeuwenhoek
126332. The smallest size of a cell which can be seen with the unaided eye is
A
100 micronsB
1000 micronsC
One micronD
10 micronsCorrect Answer: A. 100 microns
133833. Oil is obtained from the endosperm of
A
Mustard
B
Sesame
C
Groundnut
D
CoconutCorrect Answer: D. Coconut
131534. Which one of the following is not an endocrine gland?
A
Salivary gland
B
Thyroid gland
C
Adrenal gland (cortex)
D
Pituitary glandCorrect Answer: A. Salivary gland
133235. The percentage of solar energy absorbed by the leaves of green plants in photosynthesis is
A
1
B
10
C
30
D
50Correct Answer: A. 1
133136. In angiosperm, triple fusion is required for the formation of
A
Suspensor
B
Pericarp
C
Embryo
D
EndospermCorrect Answer: D. Endosperm
141337. Name one rootless plant
A
Monochoria
B
Pistia
C
Ceratophyllum
D
EichhorniaCorrect Answer: B. Pistia
127638. Xylem tissue mainly concerned with the
A
Storage of prepared foods plantsB
Transport of enzymes in plantsC
Photosynthesis of plantsD
Transport of water and mineral nutrients in plantsCorrect Answer: D. Transport of water and mineral nutrients in plants
Explanation:
Explanation:
Xylem is present in the vascular plant. It is a specialized tissue that helps in the conduction of water and nutrients from the soil to the stem and leaves. It provides mechanical support to the plant. Xylem consists of dead cells (parenchyma is the only living cell present in the xylem).
252539. Where is the image of an object formed in human eye?
A
corneaB
irisC
pupilD
retinaCorrect Answer: D. retina
252640. Halophytes grow well in
A
acidic soilsB
cold soilsC
soils containing calciumD
saline soilsCorrect Answer: D. saline soils
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