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.
List few plants found around your house.
Q 3.
Why do we see dew drops on leaves in the early morning?
Q 4.
Name the female part of a flower. Write names of its parts and draw a diagram.
Q 6.
Why does white flowers bloom at night?
Q 7.
Name the part of plant which helps in holding the plant in the soil.
Q 8.
What are lateral roots?
Q 10.
What is the function of a stem in a plant?
Q 12.
Name the prominent parts of a flower.
Q 14.
What are petals? Why are they generally coloured?
Q 15.
What are tap roots?
Q 16.
Name a plant that eats insect.
Q 17.
Name two flowers, each with joined and separates sepals.
Q 18.
What are creepers? Write an example.
Q 19.
Name the types of roots shown in the Fig. 7.7.
Q 20.
What are shrubs? Give two examples.
Q 21.
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 22.
In which part of a flower you are likely to find the ovary?
Q 23.
Name two plants which have fibrous root.
Q 24.
Explain the main functions of leaf.
Q 25.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 26.
Name the part of the plant which produces its food. Name this process.
Q 27.
Name the process by which leaves can prepare their food.
Q 28.
Give names of two plants which have tap root.
Q 29.
What are fibrous roots?
Q 30.
What are the major parts of plants?
Q 31.
How many kinds of plants are there?
Q 32.
What are unisexual and bisexual flowers?
Q 33.
What is the relation between leaf venation and the type of roots?
Q 34.
Does the stem prepare food for any plant?
Q 35.
Classify plants and give an example of each.
Q 37.
Where does the photosynthesis take place in plants?
Q 38.
What are sepals? What are their functions?
Q 40.
Explain an activity to show that stem conducts water and other substances.
Q 41.
Name the male part of a flower. Write names of its parts and draw a diagram.
Q 42.
Are all the plants same in size?
Q 43.
Give two examples of trees.
Q 44.
What is leaf venation?
Q 45.
How many types of leaf venation are there?
Q 46.
What are unisexual and bisexual flowers?
Q 47.
Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?
Q 48.
Why are petals colourful?
Q 49.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 50.
Explain an activity to test the presence of starch in a leaf.
