Give reasons: (i) Plants look green.

Monjur Alahi

Give reasons:
(i) Plants look green.
(ii) The respiratory surface of earthworm is its skin.
(iii) Nutrition is necessary for an organism.
(iv) We boil the leaf in alcohol when we are testing it for starch.


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(i) The leaves of plants contain green pigments called chlorophyll which is necessary for photosynthesis. Plants reflect green light of sunlight, so they look green.
(ii) The skin of earthworm is quite thin and moist and has rich blood supply. So, it respires through its skin. Guard cells
(iii) An organism requires nutrients like carbohydrates, fats, proteins, minerals and vitamins for the growth, reproduction and metabolic activities, so nutrition is necessary for an organism.
(iv) We boil the leaf in alcohol to remove chlorophyll from green leaf.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
Why does the sun look so big and the other stars look so small?

Sun is also a star but sun is the only star that is near to Earth . There are many other Star's which is bigger than sun but they look's...

1 Answers 1 views
Two green plants are kept separately in oxygen , one in the dark and the other in continuous light. Which one will live longer? Give reasons.

Plant kept in continuous light will live longer, because it will be able to produce oxygen required for its respiration by the process of photosynthesis.

1 Answers 4 views
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round,

(b) (i) and (iv)

1 Answers 1 views
A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability that it is green is 2/3,

Solution: Total number of outcomes = 24 P (Green) = 2/3 If number of green balls is G then; G/24 = 2/3 or, G = (24*2)/3 = 16 Hence, number of blue balls = 24 –...

1 Answers 1 views
Chalk, iron nail, wood, aluminium, candle, cotton usually look different from each other. Give some properties.

Hint: Write on the basis of lustre, hardness, softness, roughness or smoothness.

1 Answers 1 views
GM plants are useful in many ways. How would you convince farmers to grow GM plants on their field ? Explain giving three reasons.

Make crop more tolerant to abiotic stresses / Reduce reliance on chemical pesticides / Help to reduce post harvest loses / Increase efficiency of mineral usage / Enhance nutritional value...

1 Answers 1 views
GM plants are useful in many ways. How would you convince farmers to grow GM plants on their field ? Explain giving three reasons,..

Make crop more tolerant to abiotic stresses / Reduce reliance on chemical pesticides / Help to reduce post harvest loses / Increase efficiency of mineral usage / Enhance nutritional value...

1 Answers 2 views
Give reasons: (a) Man modifies his environment (b) Plants and animals depend on each other. .

(a) Man modifies his environment to fulfil his needs and make his life comfortable. He also modified his environment to adopt himself to the natural surroundings. (b) Plants and animals depend...

1 Answers 1 views
The green scum seen in the fresh water bodies is: a. blue green algae

d. both (a) and (c) is correct

1 Answers 1 views
In a box there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?

(e) If the drawn ball is neither red nor green, then it must be blue, which can be picked in 7C1 = 7 ways. One ball can be picked from...

1 Answers 4 views
X