Wool industry is an important means of livelihood for many people in our country. But sorters’ job is risky as sometimes they get infected by a _______ called _______,
which leads to a fatal lung disease called sorter’s disease.
A Bacterium, Bacillus anthracis
B Bacterium, Escherichia coli
C Fungus, Salmonella typhimurium
D Virus, Vibrio anthracis
Sania was asked to write about some actions which are voluntary in nature. She has written some involuntary actions too. Pick the involuntary actions written by Sania from the list given below.
(i) Chewing food
(ii) Sitting upright on a table
(iii) Digestion of food
(iv) Beating of heart
(v) Singing a song
A (i), (iii) and (v)
B (iii), (iv) and (vii)
C (ii), (iii) and (vi)
D (v) and (vii)
When oxides of nitrogen and sulphur react with water vapour in the air they cause __________.
A Ozone depletion
B Global warming
C Acid rain
D Oil spill
Given below are the four food components (P-S) and their corresponding sources.
P – Meat, Fish, Egg
Q – Butter, Ghee, Margarine
R – Bread, Biscuit, Potato
S – Amla, Tomato, Orange
Select the incorrect statement regarding them.
A Deficiency of P causes marasmus in children whereas deficiency of Q causes kwashiorkor in adults.
B Among P, Q, R and S, 1 gram of Q produces the maximum energy.
C Excess of R gets stored in body cells and is used for production of energy whenever required.
D Deficiency of S leads to a disease in which gums swell up and bleed.
Advika took a Croton plant with shaded leaves and set up an experiment as shown here. She kept the plant first in darkness for a few hours and then placed it in sunlight. After 6 hours, she performed iodine test on plucked leaves P, Q and R. Which of the following is the possible outcome? (Note : Shaded portion in the question figure indicates green colour and in the options, it indicates blue-black colour.)
A - Leaf Q
B - Leaf Q
C - Leaf R
D - Leaf P
Correct answer is D since the CO2 obsorbent is present in Leaf P.When the outer circle is not present,it does not mean the leaf cannot prepare starch.The picture depiction is confusing.
Consider the following statements. Select the option which correctly identifies true (T) and false (F) ones.
(i) Microorganisms act upon the dead plants to produce humus.
(ii) Autotrophs lie at the base of a food chain.
(iii) Large scale cutting of trees is called afforestation.
(iv) Branched part of a tree above the stem is called crown.
But base means last. Doesn't it?
Study the given steps involved in formation of fruit from flower.
P. The ovary develops into a fruit.
Q. The pollen grains grow long tube inside the style.
R. The ovules grow into seeds.
S. The male gametes fuse with the egg.
T. The pollen grains are deposited on the stigma of another flower.
U. The pollen tube enters the ovary.
Select the option which arranges given steps into correct sequence.
AT → U → Q → S → R → P
BQ → T → U → R → S → P
CT → Q → U → S → R → P
DU → Q → T → S → R → P