Free Nutrition in Plants 02 Practice Test - 7th grade
Question 1
In a cell, the nucleus is surrounded by a jelly - like substance called cell membrane.
True
False
SOLUTION
Solution : B
In a cell, the nucleus is surrounded by a jelly- like substance called cytoplasm. It is mainly composed of water, salts and proteins. Cell membrane is the outer boundary which encloses the cell. Hence, this statement is false.
Question 2
Iodine is used to test the presence of starch.
True
False
SOLUTION
Solution : A
In the presence of starch, iodine changes its color from brown to blue-black or purple. So, iodine can be used to test the presence of starch.
Question 3
Leaves are green in color due to the presence of a green pigment called
cytoplasm
nucleoplasm
chlorophyll
hemoglobin
SOLUTION
Solution : C
Green leaves have a pigment called chlorophyll. Chlorophyll absorbs light energy which is used for photosynthesis. Chorlophyll is the pigment that imparts green color to the plants.
Question 4
Organisms that are dependent on food prepared by plants are called ___________.
autotrophs
heterotrophs
neutrotrophs
saprotrophs
SOLUTION
Solution : B
Animals and most of other organisms cannot prepare their own food. They consume food prepared by the plants. So, they are called heterotrophs (heteros = other, trophism = nutrition).
Question 5
The spines seen on desert plants are modified leaves.
SOLUTION
Solution : A
Desert plants have different kinds of adaptations to cope up with extreme conditions like high temperature, water scarcity, etc. The cactus leaves are modified into sharp needle-like structures to minimize the loss of water due to evaporation.
Question 6
Pitcher plants feed on insects to meet their _________ requirements.
SOLUTION
Solution : A
Pitcher plants usually grow in areas deficient in nitrogen. Nitrogen is an important component required by plants. These plants are green and make their food by photosynthesis but to meet their nitrogen needs, they feed on insects.
Question 7
Fungi use __ mode of nutrition.
SOLUTION
Solution : C
Fungi secrete digestive juices on the dead and decaying matter and convert it into a solution. Then they absorb the nutrients from it. This mode of nutrition in which organisms take in nutrients in solution form from dead matter is called saprotrophic nutrition.
Question 8
Stomata are surrounded by __ .
SOLUTION
Solution : B
Carbon dioxide from air is taken in through tiny pores called stomata present on the surface of the leaves. These pores are surrounded by guard cells. Guard cells regulate the opening and closing of the stomata.
Question 9
Plants lose water through leaves by a process called __ .
SOLUTION
Solution : C
Transpiration is the process through which plants lose water through stomata. Stomata are usually present on the underside of the leaves. It is essentially evaporation of water from the leaves of the plants.
Question 10
A plant which obtains nutrition from the host and deprives it of its valuable nutrients is called a ________ .
SOLUTION
Solution : D
∙ Parasitic plants obtain nutrition from the host and in the process deprives the host of its valuable nutrients. An example of parasitic plant is cuscuta.
∙ Autotrophs are organisms which can synthesise their own food.
∙ Heterotrophs feed on autotrophs for food.
∙ Saprophytes absorb nutrients from dead and decaying organisms.