7th Grade > Biology
NUTRITION IN PLANTS MCQs
Total Questions : 117
| Page 11 of 12 pages
Answer: Option D. ->
parasite
:
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.
:
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.
Answer: Option B. ->
guard cells
:
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.
:
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.
Answer: Option B. ->
guard cells
:
:
The green colour in autotrophic plants is due to a green pigment called chlorophyll. It harnesses sunlight necessary for photosynthesis.
Answer: Option B. ->
guard cells
:
:
Definition: 1 Mark
Examples: 1 Mark
Heterotrophs are organisms which depend on other organisms or dead organic matter for their food sources. This type of nutrition is said to be the heterotrophic mode of nutrition.
Examples: Indian pipe, venus flytrap
Answer: Option B. ->
guard cells
:
:
Each point: 1 Mark
1. All organism require food to survive.
2. Organisms need food to produce energy for various metabolic and physiological activities.
3. It also provides nutrients for protection against diseases.
Answer: Option B. ->
guard cells
:
:
Classification: 1 Mark each
Based on their mode of nutrition, plants can be classified as either autotrophic or heterotrophic.
Autotrophs are plants which produce their own food from sunlight, carbon dioxide, and water by performing photosynthesis. Examples: all green plants.
Heterotrophic plants are those that derive their nutrition from autotrophs or other organisms. Example: mistletoe.
Answer: Option B. ->
guard cells
:
:
Definition: 1 Mark
Examples: 1 Mark
Plants which consume insects to meet their energy requirements are called insectivorous plants.
Examples: Nepenthes/pitcher plant and Venus fly trap.
Answer: Option B. ->
guard cells
:
:
Each point: 1 Mark
(i) All green plants can prepare their own food – Correct.
(ii) Most animals are autotrophs – Incorrect because animals are heterotrophs as they are directly or indirectly dependent on plants for food.
(iii) Carbon dioxide is not required for photosynthesis – Incorrect because CO2 is essential for photosynthesis.
Answer: Option B. ->
guard cells
:
:
Definition: 1 Mark
Food: 1 Mark
Examples: 1 Mark
The organisms which obtain their nutrition from dead and decaying organic matter are called saprophytes. Fungi are examples of saprophytes. These organisms extend their mycelium and secrete enzymes to digest the decaying matter. They secrete digestive juices (enzymes) like cellulases, proteases, and lipases onto dead and decaying matter to digest it and then absorb nutrients from it.
Examples: mushroom, bread mold, etc.
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