Question:
Explain that sunlight is essential for photosynthesis.
Answer:
Take a potted plant having green leaves. Place it in a dark room for a day or two so that all the starch present in leaves is used by the plant. Now cover a portion of leaf with black paper and keep the plant in the sun for a day. Pluck the leaf, remove the black paper and test it for the starch. We see that only that part of the leaf becomes blue-black which was open to sun. The covered part does not become blue-black. This shows that no starch is formed because it gets no sunlight.
Getting to Know Plants
Q 1.
Write the names of the parts of a flower in sequence, from outside to inside.
Q 2.
Name the female part of a flower. Write names of its parts and draw a diagram.
Q 3.
List few plants found around your house.
Q 4.
Why do we see dew drops on leaves in the early morning?
Q 5.
What are trees? Give two examples.
Q 7.
Why does white flowers bloom at night?
Q 8.
What is the function of a stem in a plant?
Q 9.
Give two examples of trees.
Q 10.
Give names of two plants which have tap root.
Q 13.
Name the process by which leaves can prepare their food.
Q 14.
Name the part of plant which helps in holding the plant in the soil.
Q 15.
Name the prominent parts of a flower.
Q 16.
Name the various parts of pistil.
Q 17.
Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), china rose.
Q 19.
What are shrubs? Give two examples.
Q 20.
Name a plant that eats insect.
Q 21.
In which part of a flower you are likely to find the ovary?
Q 22.
What are the raw materials for photosynthesis?
Q 23.
What are petals? Why are they generally coloured?
Q 25.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 26.
What are the major parts of plants?
Q 27.
What is transpiration?
Q 28.
What are sepals? What are their functions?
Q 29.
What are herbs? Give two examples.
Q 30.
What are unisexual and bisexual flowers?
Q 31.
Why are petals colourful?
Q 32.
What do you mean by a complete and incomplete flower?
Q 33.
Explain that sunlight is essential for photosynthesis.
Q 34.
Name the part of the plant which produces its food. Name this process.
Q 35.
How many kinds of plants are there?
Q 36.
How many types of leaf venation are there?
Q 37.
Does the stem prepare food for any plant?
Q 39.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 41.
What is leaf venation?
Q 42.
Where does the photosynthesis take place in plants?
Q 43.
Does the stem prepare food for any plant?
Q 44.
Classify plants and give an example of each.
Q 45.
Explain the main functions of leaf.
Q 46.
Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?
Q 47.
Name a plant that has underground as well as aerial (above the ground) root system.
Q 48.
Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
(b) Leaves hold the plant upright.
(c) Roots conduct water to the leaves.
(d) The number of sepals and petals in a flower is always equal.
(e) If the sepals of a flower are joined together, its petals are also joined together,
(f) If the petals of a flower are joined together, then the pistil is joined to the petal.
Q 49.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 50.
Name the part of the plant which produces its food. Name this process.
