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1. A
   Nucleolus
2. B
   Chloroplast
3. C
   Ribosome
4. D
   Plasma Membrane

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1. A
   Ribosome
2. B
   Nucleus
3. C
   Mitochondria
4. D
   Chloroplast

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1. A
   Fibres
2. B
   Tracheids
3. C
   Pericycle
4. D
   Sieve tubes

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1. A
   $\textit{Cladophora}$
2. B
   $\textit{Penicillium}$
3. C
   $\textit{Marsilea}$
4. D
   $\textit{Anabaena}$

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1. A
   Caterpillar
2. B
   Crabapple tree
3. C
   Frog
4. D
   Sparrowhawk

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1. A
   greatest difference in the sea level at high and low tides
2. B
   lowest difference in the sea level at high and low tides
3. C
   no difference in the sea level at high and low tides
4. D
   counteraction of gravitational pull of the Sun to that of Moon

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1. A
   Nuclear energy
2. B
   Chemical energy
3. C
   Potential energy
4. D
   Thermal energy

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1. A
   a shower of rain drops
2. B
   a plane mirror
3. C
   a convex lens
4. D
   a combination of a convex lens and a concave lens

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1. A
   Gravitational potential energy $\rightarrow$ heat energy to air $\rightarrow$ kinetic energy $\rightarrow$ heat energy to ground and apple $\rightarrow$ sound energy
2. B
   Gravitational potential energy $\rightarrow$ sound energy $\rightarrow$ kinetic energy $\rightarrow$ heat energy to air $\rightarrow$ heat energy to ground and apple
3. C
   Gravitational potential energy $\rightarrow$ kinetic energy $\rightarrow$ heat energy to air $\rightarrow$ heat energy to ground and apple $\rightarrow$ sound energy
4. D
   Gravitational potential energy $\rightarrow$ kinetic energy $\rightarrow$ sound energy $\rightarrow$ heat energy to air $\rightarrow$ heat energy to ground and apple

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1. A
   Bauxite
2. B
   Quartz
3. C
   Feldspar
4. D
   Pitchblende

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