Biology MCQ Question and Answer
Biology MCQ Question and Answer
21. Iron deficiency results in—
- Leaf tip necrosis
- Small leaves disease
- Decreased protein synthesis
- Intervenal chlorosis appearing first in young leaves
22. A phytohormone is—
- Naturally produced
- Synthetic substance
- Both (A) and (B)
- None of these
23. During the seismonastic movement in Mimosa pudica turgor changes occur in—
- Leaflets
- Stipules
- Pulvinus leaf base
- Petiole and stem
24. Evergeen trees remain green through the year on account of—
- Cold climate
- Absence of leaf fall
- Leaves falling in small number interval
- Supply of moisture throughout year
25. Phenotypic ratio of dihybrid test cross is—
- 15 : 1
- 3 : 1
- 9 : 3 : 3 : 1
- 1 : 1 : 1 : 1
26. The damaged ozone layer is situated in—
- Ionosphere
- Mesosphere
- Stratosphere
- Troposphere
27. Which one of the following is ordinarily not an air pollutant ?
- CO2
- CO
- SO2
- Hydrocarbon
30. The first juvenile larva of Ascaris is known as—
- Filiform larva
- Rhabditiform larva
- Miracidium larva
- Microfilariae