Cycles
water, oxygen, warmth
The stems of a plant only transport water and mineral salts from the roots to other parts of the plant. (True/False)
False. The stem also transport food made in the leaves to other parts of the plant.
Human breathe in only oxygen and breathe out only carbon dioxide. (True/False)
False. We breathe in and breathe out a mixture of gases present in the air around us.
Chlorophyll found in plant cells contains chloroplasts. (True/False)
False. Chloroplasts found in plant cells contains chlorophyll.
Photosynthesis can take place at all times of the day as long as the plant receives light. (True/False)
True
What happens to the ovules in the ovary of a flower after fertilisation?
They turn into seeds.
What is the function of the water-carrying tubes and food-carrying tubes in plants?
The xylem transport water and dissolved mineral salts from the roots to all parts of the plant. The phloem transport food from the leaves to the rest of the plant.
An athlete ate a bowl of cereal before he began his daily training. Which two body systems enable him to have the energy to do his training?
digestive and circulatory system
Bigger living things have a ______________ of cells than smaller living things. As a living thing grows bigger, the ___________ of cells increases.
bigger number; number
Plants need __________, __________ and ______________ during photosynthesis to make their own food.
light, water, carbon dioxide
For an adult plant to produce seeds, which process(es) must take place?
Pollination and fertilisation
When the roots of a plant is removed, it died after three days. Explain why.
Since the roots are removed, the plant was not able to absorb enough water for it to survive.
Other than the direction of blood flow, state one difference between the blood from the heart to the lungs and from the lungs to the heart.
The blood from the heart to the lungs is rich in carbon dioxide but the blood from the lungs to heart is rich in oxygen.
A substance has to pass through various parts of a plant cell before it is able to reach the nucleus. State the correct order in which the substance has to pass through.
cell wall --> cell membrane -->cytoplasm --> nucleus
Which of the following statements is/are correct?
A - Energy from the sun is transferred to the plants during photosynthesis
B - The sun is the main provider of food for all living organisms
C - Plants need sunlight, water and oxygen in order to make food.
D - All living things depend on plants directly and indirectly for food.
A and D only
Seed T has a wing-like structure. Why is it an advantage for seed T to be found on a tall tree?
Seed T can be dispersed further away from the parent plant and other seedlings to avoid overcrowding and competition for space, light, water and nutrients.
Keith puts a plant with white flowers in a container filled with blue liquid for a few hours. He observed that the white flowers have turned slightly blue. What has caused the flowers to change their colours?
The roots absorb the blue liquid which is then transported to the flowers by the stem.
How is the human circulatory system similar to the transport system in plants?
A. Both systems transport food and water to all their parts.
B. Both systems need carbon dioxide in order to carry out processes.
C. Both systems use a liquid as a mode of transport.
D. Both systems have two types of vessels in the.
A only
A cell has cell membrane, cell wall and nucleus. Which part(s) of the multicellular organism could the cell be removed from?
A - root hair of a plant; B - leaf of a flowering plant; C - skin of an animal; D - petal of a flowering plant; E - cheek of an animal
A and D only
Suggest how having at least 8 hours of sunlight daily may help in producing sweet strawberries.
This allows the strawberries to carry out photosynthesis for at least 8 hours. A larger amount of sugars may be produced by the pants and stored in the strawberries, thus making them sweet.
Natural selection refers to the process by which species adapt to the environment in order to survive and reproduce successfully. How then does 'natural selection' play a part in the fertilisation process?
Out of the million of sperms, only the one that is able to swim the fastest will reach the egg first to fertilise it. Hence, nature ensures that the healthiest sperm will fertilise the egg. The embryo will have a maximum chance of becoming a strong and healthy baby.
The outer-ring of a stem was removed. What will happen to the stem after a three days? Explain.
There is a swollen bulge above the area where the outer ring was removed. The food-carrying tubes which carry the food made in the leaves during photosynthesis were removed. Without it, food was unable to travel down the stem and accumulate at the top.
Baby Danny was born with a tiny hole in his heart. He needed emergency surgery to close up the hole. Why couldn't Danny survive with the hole in his heart?
It was found that there were 128 daughter cells after a parent cell divided for the 4th time. How many parent cells were there in the first place?
8
Plant P growing in a sunny area has smaller leaves than the same type of plant growing in a shaded area. Explain.
In the sunny area, the plant is exposed to more light than in a shaded area. To prevent the leaf from losing too much water, it has a smaller size leaf.