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 2.
Name the part of the plant which produces its food. Name this process.
Q 3.
What are herbs? Give two examples.
Q 4.
Name a plant that eats insect.
Q 5.
What is leaf venation?
Q 6.
What is the relation between leaf venation and the type of roots?
Q 7.
What are lateral roots?
Q 8.
What are petals? Why are they generally coloured?
Q 10.
Where does the photosynthesis take place in plants?
Q 11.
Does the stem prepare food for any plant?
Q 12.
Name two plants that belong to herbs.
Q 14.
Name the process by which leaves can prepare their food.
Q 16.
What are shrubs? Give two examples.
Q 17.
Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?
Q 18.
What is the function of a stem in a plant?
Q 19.
Name the part of the plant which produces its food. Name this process.
Q 20.
Give two examples of shrubs.
Q 21.
What is transpiration?
Q 22.
Where does the photosynthesis take place in plants?
Q 23.
Does the stem prepare food for any plant?
Q 24.
Classify plants and give an example of each.
Q 25.
How can one destarch the leaves of potted plant without plucking, them?
Q 26.
Explain that sunlight is essential for photosynthesis.
Q 27.
Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), china rose.
Q 28.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 30.
Why are petals colourful?
Q 31.
Why does white flowers bloom at night?
Q 32.
What do you mean by a complete and incomplete flower?
Q 33.
Is it possible for you to recognise the leaves without seeing them? How?
Q 34.
Are all the plants same in size?
Q 35.
What are the raw materials for photosynthesis?
Q 36.
Give names of two plants which have tap root.
Q 37.
What are trees? Give two examples.
Q 38.
Name a plant that has underground as well as aerial (above the ground) root system.
Q 39.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 40.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 41.
What are fibrous roots?
Q 42.
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 43.
Give two examples of trees.
Q 45.
How many kinds of plants are there?
Q 47.
Name the various parts of pistil.
Q 49.
What are the major parts of plants?
Q 50.
Name various parts of stamen.
