Atoms and Molecules — Science STD 9 — Question

Which of the following device does not work on the multiple reflections of sound waves?

1. Stethoscope.
2. Hydrophone.
3. Soundboard.
4. Megaphone.

The body of organisms has chitinous cell wall and is made up of hyphae and mycelium:

1. Spirogyra.
2. Rhizopus.
3. Funaria.
4. Riccia.

Cloud formation takes place in which part of atmosphere:

1. Troposphere.
2. Stratosphere.
3. Thermosphere.
4. Ozonosphere.

Which of the following group of plants is called vascular cryptogams?

1. Thallophyta.
2. Bryophyte.
3. Pteridophyta.
4. Angiospermae.

Sex organs are unicellular and non-jacketed in:

1. Algae.
2. Bryophytes.
3. Pteridophytes.
4. Gymnosperms.

The jersey bull used for crossbreeding is exotic variety from:

Which condition out of the following will increase the evaporation of water:

Respiration in arthropods occurs through:

1. Gills.
2. Booklungs.
3. Trachea.
4. All of the above.

Xylem is made of:

Which of the following has two chambered heart?

1. Labeo.
2. Hemidactylus.
3. Bufo.
4. Columba.