Answer the following questions in brief.
a) On the basis of what factor, living organisms are divided into autotrophs an
b) Why is alcohol not heated directly to remove chlorophyll from the leaves?
c) Why do we add KOH in the bottle in the experiment to demonstrate that
for photosynthesis?
d) Ramesh took two plants. One with green leaves and the other with varieg
experiment to demonstrate the presence of starch. He found that the pla
positive result. Why?
Answers
Answer:
The kidneys in human beings are a part of the system for
nutrition
(b) respiration
(c) excretion
(d) transpiration
Answer.
Kidneys are a part of excretory system of our body, they are responsible for blood filtration and removes waste products.
Hence, the answer is (c) excretion.
Question 2.
The xylem in plants are responsible for
transport of water
(b) transport of food
(c) transport of amino acids
(d) transport of oxygen
Answer.
The xylem is responsible for transport of water in plants. Hence, the answer is (a) transport of water.
Question3.
The autotrophic mode of nutrition requires
(a) carbon dioxide and water
(b) chlorophyll
(c) sunlight
(d) all of the above
Answer.
The autotrophic mode of nutrition occurs in green plants which synthesize their own food.
They capture carbon dioxide from air, roots absorb water and green plants have chlorophyll that helps in capturing light energy from sun.
Hence, (d) autotrophic mode of nutrition requires carbon dioxide, water, sunlight and chlorophyll.
Question 4.
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
Cytoplasm
Mitochondria
Chloroplast
Nucleus
Answer.
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in mitochondria.
Hence, the answer is (b) mitochondria.
Question 5.
How are fats digested in our bodies? Where does this process takes place?
Answer.
Fats are present in form of large globules in small intestine.
Small intestine receives secretions form liver and pancreas as bile juice and pancreatic juice respectively.
Bile salts break down large globules into smaller globules which makes it easier for pancreatic juice to act on them.
This is called emulsification of fats. This process takes place in small intestine.