Control and Coordination

Which of the following is a plant hormone?

1. Insulin
2. Thyroxin
3. Oestrogen
4. Cytokinin

Solution:

Cytokinin is a phytohormone. It helps in cell division.

Correct Answer: D

The gap between two neurons is called a

1. dendrite
2. synapse
3. axon
4. impulse

Solution:

Synapse is a functional gap between dendrites of one neuron and the axon terminals of another.

Correct Answer: B

Chemical Reaction and Equations – Solutions

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s)®2Pb(s)+CO₂(g)

1. Lead is getting reduced.
2. Carbon dioxide is getting oxidised.
3. Caron is getting oxidised.
4. Lead oxide is getting reduced.

(a) and (b)

(a) and (c)

(a) (b) and (c)

all

Solution:

Lead oxide is getting reduced and carbon is getting oxidised, hence, (a) and (b)

are incorrect options.

Correct answer: (i)

Chemical Reaction and Equations – Solutions

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s)®2Pb(s)+CO₂(g)

1. Lead is getting reduced.
2. Carbon dioxide is getting oxidised.
3. Caron is getting oxidised.
4. Lead oxide is getting reduced.

(a) and (b)

(a) and (c)

(a) (b) and (c)

all

Solution:

Lead oxide is getting reduced and carbon is getting oxidised, hence, (a) and (b)

are incorrect options.

Correct answer: (i)

Chemical Reaction and Equations – Solutions

Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s)®2Pb(s)+CO₂(g)

1. Lead is getting reduced.
2. Carbon dioxide is getting oxidised.
3. Caron is getting oxidised.
4. Lead oxide is getting reduced.

(a) and (b)

(a) and (c)

(a) (b) and (c)

all

Solution:

Lead oxide is getting reduced and carbon is getting oxidised, hence, (a) and (b)

are incorrect options.

Correct answer: (i)