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.
List few plants found around your house.
Q 4.
Why do we see dew drops on leaves in the early morning?
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 trees? Give two examples.
Q 9.
What is the function of a stem in a plant?
Q 12.
What is transpiration?
Q 13.
Name the process by which leaves can prepare their food.
Q 14.
Give names of two plants which have tap root.
Q 15.
Name the prominent parts of a flower.
Q 16.
Name a plant that eats insect.
Q 17.
In which part of a flower you are likely to find the ovary?
Q 18.
Give two examples of trees.
Q 19.
What are unisexual and bisexual flowers?
Q 20.
Which of the following leaves have reticulate venation?
Wheat, tulsi, maize, grass, coriander (dhania), china rose.
Q 21.
Name the part of the plant which produces its food. Name this process.
Q 22.
What are the major parts of plants?
Q 23.
Where does the photosynthesis take place in plants?
Q 24.
What are shrubs? Give two examples.
Q 25.
Explain an activity to show that stem conducts water and other substances.
Q 26.
Name a plant that has underground as well as aerial (above the ground) root system.
Q 27.
What do you mean by a complete and incomplete flower?
Q 28.
What is the relation between leaf venation and the type of roots?
Q 29.
Explain that sunlight is essential for photosynthesis.
Q 30.
Name two flowers, each with joined and separates sepals.
Q 31.
Are all the plants same in size?
Q 32.
What are lateral roots?
Q 33.
Name the various parts of pistil.
Q 34.
Pitcher plant has green leaves which can prepare food by photosynthesis then why does it eat insects?
Q 35.
Name the male part of a flower. Write names of its parts and draw a diagram.
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.
Is it possible for you to recognise the leaves without seeing them? How?
Q 38.
How many kinds of plants are there?
Q 39.
Name two plants that belong to herbs.
Q 40.
Where does the photosynthesis take place in plants?
Q 41.
Name the types of roots shown in the Fig. 7.7.
Q 42.
Leaves need oxygen and carbon-dioxide (for photosynthesis). How do they get these gases?
Q 43.
Explain an activity to test the presence of starch in a leaf.
Q 44.
If a plant has fibrous root, what type of venation are its leaves likely to have?
Q 45.
What is leaf venation?
Q 46.
What are tap roots?
Q 47.
Name two plants which have fibrous root.
Q 48.
Name the part of the plant which produces its food. Name this process.
