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.
Why do we see dew drops on leaves in the early morning?
Q 3.
List few plants found around your house.
Q 5.
What are lateral roots?
Q 6.
Name the part of plant which helps in holding the plant in the soil.
Q 7.
Why does white flowers bloom at night?
Q 9.
What is the function of a stem in a plant?
Q 10.
Name the prominent parts of a flower.
Q 13.
Name the female part of a flower. Write names of its parts and draw a diagram.
Q 14.
Name the process by which leaves can prepare their food.
Q 15.
What are fibrous roots?
Q 16.
Name two flowers, each with joined and separates sepals.
Q 17.
Name a plant that eats insect.
Q 18.
Name the part of the plant which produces its food. Name this process.
Q 20.
What are tap roots?
Q 21.
What are shrubs? Give two examples.
Q 22.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 23.
Are all the plants same in size?
Q 24.
What are petals? Why are they generally coloured?
Q 26.
Can you find a plant in your house or in your neighbourhood which has a long but a weak stem? Write its name. In which category would you classify it?
Q 27.
What is leaf venation?
Q 28.
Where does the photosynthesis take place in plants?
Q 29.
Does the stem prepare food for any plant?
Q 30.
What are creepers? Write an example.
Q 31.
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 32.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 33.
Name two plants that belong to herbs.
Q 34.
How many types of leaf venation are there?
Q 35.
Give names of two plants which have tap root.
Q 36.
What are sepals? What are their functions?
Q 38.
Explain the main functions of leaf.
Q 39.
What are unisexual and bisexual flowers?
Q 40.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 41.
Explain that sunlight is essential for photosynthesis.
Q 42.
Is it possible for you to recognise the leaves without seeing them? How?
Q 43.
Name the part of the plant which produces its food. Name this process.
Q 44.
In which part of a flower you are likely to find the ovary?
Q 45.
What are the major parts of plants?
Q 46.
What is transpiration?
Q 47.
What are the raw materials for photosynthesis?
Q 48.
Where does the photosynthesis take place in plants?
Q 49.
Does the stem prepare food for any plant?
Q 50.
Name various parts of stamen.
