DAV Class 7 Science Chapter 1 Nutrition in Living Organisms – Plants Question Answer Notes
DAV Class 7 Science Chapter 1 Nutrition in Living Organisms – Plants Question Answer Notes Solution by Expert Science Teacher. DAV Class 7 Science 1st Chapter Nutrition in Living Organisms – Plants for Students of DAV Schools.
Lesson No 1
Nutrition in Living Organisms – Plants
A.) Fill in the blanks.
Answer: (1) Heterotrophs (2) roots (3) Carbon dioxide, Oxygen (4) Stomata (5) insectivorous (6) (a) water (b) Carbon dioxide
B.) Match the following:
1) Chlorophyll |
(a) Autotrophs |
(2) Lichens |
(b) Saprotrophs |
(3) Fungi |
(c) Symbiotic relationship |
(4) Amarbel |
(d) Leaf |
(5) Plants |
(e) Parasite |
Answer : 1)d , 2)c, 3)b, 4)e, 5)a
C.) Tick the correct option.
Answer:
(1) autotrophs (2) leaf (3) pitcher plant (4) saprotroph (5) rhizobium
D.) Answer the following questions in brief.
1.) Why is nutrition important for a living organism?
Answer: Nutrients are important for the body because it helps all living organisms in growth and other metabolic functions of the body as well as in repairing the organs and the parts that have been damaged. the energy required for driving all the body functions come from these nutrients.
2.) How do green plants synthesis their food?
Answer: The synthesis of wood in plants happened in the leaves it is so because the leaves contain a pigment called chlorophyll. That traps the energy from the sunlight. And synthesize this energy using other products as well such as carbon dioxide and water. this process is popularly known as photosynthesis.
3.) State the role of ‘vessels’ present in a plant.
Answer: Vessels are tubular structure that run along the length of the root and the stem. It helps in carrying water and mineral from one part of the plant to the other part.
4.) Define the following terms:
(a) Symbiotic relationship
Answer: Symbiotic relationship – When two organisms develop a relationship where both of them are mutually benefited this relationship is known as symbiotic relationship. the word symbiotic comes from a Greek word symbion that means living together
(b) Nutrients
Answer: Nutrients – Important substances derived from food such as carbohydrate proteins fats and vitamins and minerals which are very useful for the body are usually called nutrients
(c) Saprotrophic mode of nutrition
Answer: The nutrition derived by animals from dead and decaying Organism is known as saprotrophic nutrition
(d) Photosynthesis
Answer: Photosynthesis – This simple process where the plant uses energy from sunlight, carbon dioxide and water to synthesize its own food with the help of a pigment called chlorophyll is known as photosynthesis
5.) When some wheat dough was left in the open for a few days, it started emitting a foul smell. State, why?
Answer:
This is due to the growth of microorganisms such as rhizopus or any other form of mold. These organisms release digestive juices that make food soluble and they can absorb it directly and gain nutritions from it. this is the reason why a steel smell starts coming from the do
E.) Answer the following questions.
1.) Why would life not be possible on the earth in the absence of photosynthesis?
Answer: This of photosynthesis directly as well as indirectly provides food to all organisms also the sun’s energy passes on to other organisms through the medium of plants. Plants give us the most important gas oxygen that is needed for breathing. Most of us humans are omnivorous as a result we not only consume other animals but we also consume a large portion of different plants.
2.) Give reasons for the following:
(a) Mushroom is a saprotroph.
Answer:.Mushroom are kinds of fungi. It is known that fun guys mostly grow on dead and decaying matter and derived nutrition from them as a result it fits the definition for saprotrophs and mushroom can thus be called one.
(b) Sun is the ultimate source of energy for all living organisms.
Answer: Sun provides energy which is basically absorbed by the plant and is synthesized and the resultant byproduct is oxygen which is necessary for all of us human beings. Other than that the sun’s energy it’s transferred to us with the medium being the plants
(c) The leaf of a plant ‘dies out’ if its stomata are blocked.
Answer: stomata is like the respiratory system of plants. If they are blocked anyhow they won’t be able to absorb carbon dioxide which is essential for the process of photosynthesis as a result it won’t be able to synthesize food. Being unable to synthesize food it will lack energy and eventually die out.
(d) Leaf is known as the food factory of the plant.
Answer:It is known as the food factory because it is the site for synthesis of food materials by the plant.
(e) Lichen is a ‘living partnership’ between a fungus and an alga and this partnership is beneficial to both.
Answer: Symbiotic association between algae and fungus that gives birth to light gin is very important because algue helps in food production since it is an autograph and fungus provides shelter do it.
3.) Why do some plants feed on insects? How does a pitcher plant catch insects?
Answer: Due to the absence of nitrogen that the plant is unable to absorb from the soil the plant feeds on insects to fulfill its deficiency.
4.) How do rhizobium bacteria and leguminous plants help each other in their survival?
Answer: The rizhobium bacteria helps leguminous plants by the process of nitrogen fixation such that the plant derives nitrogen that can be used for essential functions of the plant in turn the rise of bacteria is allowed to thrive in the nodules of the root of the plant.
5.) Complete the web chart.
More Extra Questions for Preparation
Q.1.) Fill in the blanks.
1.) Green pigment is chlorophyll on leaves.
2.) Grain plants are called autotrophs since they synthesise their own food.
3.) The green pigment present on plant is chlorophyll.
4.) Pores which absorb Co 2 are known as stomata.
Q.2.) True or false.
1.) Animal does not depend on plants for food.
Answer- False
2.) Cuscutta is an example of autotroph.
Answer- True
3.) Starch is a carbohydrate.
Answer- True
4.) Algae show the process of photosynthesis.
Answer- True
5.) Green plants are called autotrophs because they prepare their own food by photosynthesis.
Answer- True.
Q.4.) Match the pair.
1. Stomata | a. Fungi |
2.Green plants | b. Cuscutta |
3. Saphrotrophs | c. Insect eating plants |
4. Parasites | d. Autotrophs |
5. Insectivorous plants | e. Guard cells |
Answer– 1- e, 2- d, 3 – a, 4 – b, 5 – c.
Q.5.Short answers
1.) Component of food
Answer- protein, fat vitamins and minerals.
2.) By what plants can prepare their own food.
Answer water, carbon dioxide and minerals.
3.) Forms passage to provide nutrients to the leaves.
Answer vessels.
4.) Synthesis of food occurs in presence of sunlight.
Answer- Photosynthesis.
Q.6.)Answer the following.
1.) What does manure contains?
Answer- It contains certain nutrients such as nitrogen potassium phosphorus ETC.
2.) Nitrogen fixing bacteria.
Answer – Rhizobium
Q.7.) Rhizobium also shows symbiotic relationship. Explain.
Answer-
1.) Rhizobium cannot make its own food.
2.) It lives in roots of gram, beans and other legumes and provides nitrogen.
3.) In return, the plants provide food and shelter to bacteria.
4.) Thus, Rhizobium and plant’s have symbiotic relationship.
Q.8.) Why pitcher plant is called insect eating or insectivorous plants?
Answer 1.) The plant shape is pitcher like or jug like structure.
2.) The top of leaf which can be open and close the mouth of pitcher.
3.) In pitcher plant there are hairs which are attached and directed downwards.
4.) When insects land’s on the plant, the lid gets closed and traps the insects and get’s entangled in the hairs.
5.) The insects are digested by digestive juices which are secreted by the plants.
6.) Hence, the pitcher plant is called as insect eating or insectivorous plants.
9.) Food making process in plants.
1.) Plants use sunlight, water and Co2 and energy in form of sugar.
Process:-
1.) Leaves are food factories of plants.
2.) All raw materials must reach the leaf.
3.) Water and minerals present in the soil are absorbed by the roots and transported to leaves.
4.) Co2 from air is taken through the tiny pores present on surface of leaves.
5.) These pores are surrounded by ‘guard cells’.
6.) Such pores are called stomata.
7.) Water and minerals are transported to the leaves by the vessels by root, stem and leaves.
8.) They form the passage for nutrients to reach the leaf.
Q.10.) Define the following.
1.) Host.
Answer- The food taken from the plant which it is climbing is called host.
2.) Parasites.
Answer- The plant taking the nutrients from another plant’s by climbing so they are known as parasites.