Question:
Explain an activity to test the presence of starch in a leaf.
Answer:
Take a leaf in a test tube and pour spirit till it completely covers the leaf. Now put the test tube in a beaker having water. Heat the beaker till all the green colour from the leaf comes out into the spirit in the test tube. Take out the leaf and wash it with water. Put it on a plate and pour some iodine solution over it. The iodine solution is brown in colour but when it comes in contact with starch it turns blue-black. The iodine solution will turn blue-black when dropped on the leaf, this confirms the presence of starch in the leaf.
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.
Name the part of plant which helps in holding the plant in the soil.
Q 6.
What are lateral roots?
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 the part of the plant which produces its food. Name this process.
Q 18.
Name a plant that eats insect.
Q 20.
What are tap roots?
Q 21.
What are shrubs? Give two examples.
Q 22.
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 23.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 24.
What are creepers? Write an example.
Q 25.
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 26.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 27.
Name two plants that belong to herbs.
Q 28.
What is leaf venation?
Q 29.
How many types of leaf venation are there?
Q 30.
Give names of two plants which have tap root.
Q 31.
Does the stem prepare food for any plant?
Q 32.
What are petals? Why are they generally coloured?
Q 34.
What are unisexual and bisexual flowers?
Q 35.
Is it possible for you to recognise the leaves without seeing them? How?
Q 36.
Name the part of the plant which produces its food. Name this process.
Q 37.
Are all the plants same in size?
Q 38.
What are the major parts of plants?
Q 39.
Where does the photosynthesis take place in plants?
Q 40.
What are sepals? What are their functions?
Q 43.
Explain the main functions of leaf.
Q 44.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 45.
What is the relation between leaf venation and the type of roots?
Q 46.
In which part of a flower you are likely to find the ovary?
Q 47.
How many kinds of plants are there?
Q 48.
Give two examples of shrubs.
Q 49.
What are the raw materials for photosynthesis?
Q 50.
Where does the photosynthesis take place in plants?
