WORKSHEET
SCIENCE
CLASS VII
NUTRITION IN PLANTS
Q.1 Read the given passage below and answer the question:
Carnivorous plant is especially adapted for capturing and digesting insects and other animals by means of ingenious pitfalls and traps. There are more than 600 known species of carnivorous plants. The apparent trapping mechanism, which is always a modified leaf is a distinctive feature to these plants. The pitcher plant is an example of a carnivorous plant. The leaf of the Pitcher plant is modified into pitcher-like structure to trap the insects. The apex of the leaf acts like a lid which can open and close the mouth of the pitcher.
1. Insect eating carnivorous plants are also called ________plant.
(a) autotrophic
(b) saprophytic
(c) insectivorous
(d) symbiotic
2. One of the most important nutrients a pitcher plant need from insects is:
(a) Carbon dioxide
(b) Nitrogen
(c) Water
(d) Oxygen
3. Consider the following statements about the Pitcher plant:
(A) It is a parasite.
(B) The leaves are green in colour.
(C) The hair present inside the lid is directed downward.
(D) Digestive juice is secreted in the apex of the leaf. The correct statements are:
(a) (A) and (B)
(b) (B) and (C)
(c) (C) and (D)
(d) (A), (B) and (D)
4. What type of mode of nutrition is found in pitcher plants?
Ans. The pitcher plants have chlorophyll so they perform photosynthesis to produce their own food however, they grow in soil that lacks nitrogen content so, they feed on insects to obtain the nitrogen needed for their growth. Hence, they have both autotrophic as well as a partial heterotrophic mode of nutrition.
5. How does a pitcher plant catch insects?
Ans. When the insects land in the pitcher its lid closes and the insects are trapped and entangled into the hair. Digestive juices are secreted in the pitcher so the insects get digested and nutrients get absorbed.
Q. 2 How would you test the presence of starch in leaves?
Ans: Iodine solution is used to test leaves for the presence of starch.
Test – Remove chlorophyll by boiling it in alcohol and then add 2 drops of iodine solution. If the color changes to blue, indicates the presence of starch in the leaves.
Q. 3 Define cells, cell membrane, nucleus and cytoplasm.
Ans: Cells – the bodies of living organisms are made of tiny units called cells.
Cell membrane – The cell is enclosed by a thin outer boundary, called the cell membrane.
Nucleus – Most cells have a distinct, centrally located spherical structure called the nucleus.
Cytoplasm – The nucleus is surrounded by a jelly-like substance called cytoplasm.
Q. 4 Draw a diagram showing photosynthesis.
Ans:
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