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A plastic container fill of water was stoppered using a piece of stem obtained from a young maize plant whose bark had been peeled off. The next day it was noted that the stopper closed the container very tightly. Explain.
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
cell physiology
0
votes
1
answer
A layer of glycerine was applied on upper surface of a freshwater floating plant that had been kept in the dark for 24 hours. The plant was left undisturbed in bright light. After three hours test for starch carried out on the leaves produced a brown colour of iodine solution. Account for the observation.
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
nutrition in plants
0
votes
1
answer
The diagram below shows a part of the ear responsible for posture.
asked
Jul 8, 2021
in
Biology Form 4
by
anonymous
reception response and coordination
the ear
0
votes
1
answer
he diagram below shows a phenomenon which occurs during cell division.
asked
Jul 8, 2021
in
Biology Form 3
by
anonymous
reproduction
0
votes
1
answer
Under certain conditions, the carbon(IV) oxide concentration in the blood of a mammal rises above normal level. State two physiological changes that occur in the body to lower the carbon(IV) oxide back to normal.
asked
Jul 8, 2021
in
Biology Form 2
by
anonymous
respiration
gaseous exchange
excretion and homeostasis
0
votes
1
answer
Some sorghum seeds were soaked in water for two days. They were then broken into small pieces and placed on the surface of agar containing starch. After two days, it was found that the agar no longer contained starch.
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
nutrition in plants
0
votes
1
answer
Use the diagram below to answer the questions that follow.
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
classification
0
votes
1
answer
Name the branch of biology that deals with the of the following
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
classification
0
votes
1
answer
Name the branch of biology that deals with the of the following
asked
Jul 8, 2021
in
Biology Form 1
by
anonymous
classification
0
votes
1
answer
The figure below shows the cross-section of a diffusion cloud chamber used to detect radiation from radioactive sources.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
radioactivity
0
votes
1
answer
The graph below shows radioactive decay of iodine.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
radioactivity
0
votes
1
answer
A radioactive carbon-14 decays to nitrogen by beta particles as shown below.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
radioactivity
0
votes
1
answer
An X-ray operates at 30000V and the current through it is 2mA. Given that the charge of an electron is 1.6 x 10-19C, h = 6.63 x 10-34JS, speed of light, C = 3.0 x 108m/s, calculate:-
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
photoelectric effect
0
votes
1
answer
State two advantages of using a Cathode Ray Oscilloscope (C.R.O) as a voltmeter over the ordinary voltmeter.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
photoelectric effect
0
votes
1
answer
Sodium has a work function of 2.3eV. Given that: Planck’s constant h = 6.63 x 10-34JS, velocity of light in vacuum, C = 3.0 x 108m/s, 1 electron-volt (1eV) = 1.6 x 10-19 C and mass of an electron, me = 9.1 x 10-31kg, calculate:
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
photoelectric effect
0
votes
1
answer
State one factor which affects the rate of each of the above types of emission.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
photoelectric effect
0
votes
1
answer
Distinguish between thermionic emission and photoelectric emission.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
photoelectric effect
0
votes
1
answer
Explain how energy losses in a transformer are reduced by having:
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
electromagnetic induction
0
votes
1
answer
A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
electromagnetism
electromagnetic induction
0
votes
1
answer
A bar magnet is moved into a coil of insulated copper wire connected to a centre-zero galvanometer, as shown in the figure below.
asked
Jul 8, 2021
in
Physics Form 4
by
anonymous
electromagnetic induction
electromagnetism
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