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.
Name the female part of a flower. Write names of its parts and draw a diagram.
Q 3.
Why do we see dew drops on leaves in the early morning?
Q 5.
List few plants found around your house.
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 is the function of a stem in a plant?
Q 10.
What are lateral roots?
Q 11.
What are trees? Give two examples.
Q 13.
Name the prominent parts of a flower.
Q 14.
What are tap roots?
Q 16.
In which part of a flower you are likely to find the ovary?
Q 17.
What are creepers? Write an example.
Q 19.
Name a plant that eats insect.
Q 20.
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 21.
What are petals? Why are they generally coloured?
Q 22.
What is transpiration?
Q 23.
Name two plants which have fibrous root.
Q 24.
Where does the photosynthesis take place in plants?
Q 26.
Explain an activity to show that stem conducts water and other substances.
Q 27.
What are unisexual and bisexual flowers?
Q 28.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 29.
Is it possible for you to recognise the leaves without seeing them? How?
Q 30.
Name the part of the plant which produces its food. Name this process.
Q 31.
Give two examples of trees.
Q 32.
Name the process by which leaves can prepare their food.
Q 33.
Where does the photosynthesis take place in plants?
Q 34.
Name the types of roots shown in the Fig. 7.7.
Q 35.
Give names of two plants which have tap root.
Q 36.
What are fibrous roots?
Q 37.
What is the relation between leaf venation and the type of roots?
Q 38.
What do you mean by leaf venation? Explain various types of leaf venation with example.
Q 39.
Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), china rose.
Q 40.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 41.
Name the part of the plant which produces its food. Name this process.
Q 42.
Give two examples of shrubs.
Q 43.
How many types of leaf venation are there?
Q 44.
What are the raw materials for photosynthesis?
Q 45.
What are herbs? Give two examples.
Q 46.
What are shrubs? Give two examples.
Q 47.
How can one destarch the leaves of potted plant without plucking, them?
Q 48.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Q 49.
Name two flowers, each with joined and separates sepals.
Q 50.
What are the major parts of plants?
