Question

ASSIGNMENT ON 16/9/20

CLASS-X, PRACTICALS

CARBONDIOXIDE IS RELEASED DURING RESPIRATION

1) Which seeds are used in the experiment to show that carbon dioxide is given out during respiration?



Dry seeds

Germinating seeds

Boiled seeds

Crushed seeds

2) Which one of the following is used in the experiment to ensure that all connections are airtight?



Vaseline

Oil

Wax

Cotton

3) In the experiment demonstrating respiration in germinating seeds, why is KOH used?



Absorb carbon dioxide produced by the seeds.

Absorb oxygen present in the flask.

Absorb water vapour released by the seeds.

Liberate oxygen to be used by the seeds.

4) Why should we use only clear and freshly prepared lime water for this experiment?



Stale lime water does not react with CO₂.

Stale lime water has already turned milky white due to slow reaction with atmospheric CO₂.

Stale lime water has turned grey in colour.

Stale lime water has turned red in colour.

5) A student set up the apparatus for the experiments to show that Co2 is released during respiration. After 2 hours what would he or she observe?



KOH turning milky.

Water level rising in the bend tube in the beaker.

Water level decreasing in the bent in the beaker.

Water turning turbid in the beaker.

6) Germinating seeds are used to demonstrate respiration experimentally, because they carry out which of the following?



Active respiration.

Slow respiration.

Either active respiration or slow respiration.

Breathing.

7) Why is some KOH is placed in a small test tube in the flask with the germinating seeds in the experiment to demonstrate occurrence of respiration in germinating seeds.



To provide oxygen required by the seeds for respiration

To absorb carbon dioxide and create partial vacuum in the flask

To absorb water from the seeds to make them dry

To make air present in the flask alkaline

8) Aerobic respiration takes place in which cell organelle?



Mitochondria

Chloroplast

Vacuole

Lysosome

9) Name the compound in which energy is stored.



ATP

NADP

NADH

ADP

10) What is the general equation for respiration?



C₆H₁₂O₆ + 6CO₂ → 6CO₂ + 6H₂O + Energy

C₆H₁₂O₆ + 12O₂ → 6CO₂ + 6H₂O + Energy

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy

C₆H₁₂O₆ + 6O₂ → 12CO₂ + 6H₂O​

Answer 1

Answer:

take a desert plant and see that they will release carbon dioxide at night and absorb chlorophyll at night