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.
Name the female part of a flower. Write names of its parts and draw a diagram.
Q 2.
Write the names of the parts of a flower in sequence, from outside to inside.
Q 3.
Why do we see dew drops on leaves in the early morning?
Q 4.
List few plants found around your house.
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 8.
What are trees? Give two examples.
Q 9.
What is the function of a stem in a plant?
Q 11.
What are unisexual and bisexual flowers?
Q 12.
Name a plant that eats insect.
Q 13.
Name the process by which leaves can prepare their food.
Q 14.
Explain an activity to show that stem conducts water and other substances.
Q 15.
Name the prominent parts of a flower.
Q 18.
What is transpiration?
Q 19.
What do you mean by a complete and incomplete flower?
Q 20.
In which part of a flower you are likely to find the ovary?
Q 21.
What are tap roots?
Q 22.
What is the relation between leaf venation and the type of roots?
Q 23.
Explain that sunlight is essential for photosynthesis.
Q 24.
Name two flowers, each with joined and separates sepals.
Q 25.
Name two plants that belong to herbs.
Q 26.
Where does the photosynthesis take place in plants?
Q 27.
Give names of two plants which have tap root.
Q 28.
What are creepers? Write an example.
Q 29.
Name the part of the plant which produces its food. Name this process.
Q 30.
Are all the plants same in size?
Q 31.
Name the types of roots shown in the Fig. 7.7.
Q 32.
Name the various parts of pistil.
Q 33.
What are herbs? Give two examples.
Q 34.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 35.
Explain an activity to test the presence of starch in a leaf.
Q 36.
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 37.
How many kinds of plants are there?
Q 38.
How many types of leaf venation are there?
Q 39.
What are lateral roots?
Q 40.
What are petals? Why are they generally coloured?
Q 43.
Classify plants and give an example of each.
Q 44.
What are shrubs? Give two examples.
Q 45.
How can one destarch the leaves of potted plant without plucking, them?
Q 46.
Name the male part of a flower. Write names of its parts and draw a diagram.
Q 47.
Name the part of the plant which produces its food. Name this process.
Q 48.
What are the major parts of plants?
Q 49.
Give two examples of trees.
Q 50.
What is leaf venation?
