Answer: Option A. -> Only 1 & 2
THE CONGRESS GRASS (PARTHENIUM HYSTEROPHORUS) INHIBITS THE GERMINATION AND GROWTH OF MANY PLANTS AND INDUCES HAY FEVER, ASTHMA, SKIN RASHES, AND ECZEMA IN HUMAN BEINGS. TOXIC TO ANIMALS, IT CAN ALSO TAINT MUTTON AND MAKE DAIRY MILK UNPALATABLE OWING TO ITS ODOUR. WATER HYACINTH (EICHHORNIA CRASSIPES): AQUATIC PLANT OF TROPICAL SOUTH AMERICA THAT FLOURISHES IN WARM CLIMATES IN CENTRAL AMERICA, NORTH AMERICA, AFRICA, ASIA, AUSTRALIA AND NEW ZEALAND. THE HYACINTH GROWS IN THICK RAFTS, DEOXYGENATING THE WATER FOR OTHER SPECIES AND IMPEDING WATER FLOW AND NAVIGATION.

Answer: Option D. -> Sperm whale
SEALS, WALRUSES AND SEA LIONS ARE MAMMALS BELONGING TO A SINGLE TAXONOMIC GROUP ( A CLADE) CALLED PINNIPEDIA, WHICH MEANS FIN FOOTED. ALL OF THEM ARE SEMI-AQUATIC MARINE MAMMALS. THEY BELONG TO THE ORDER CARNIVORA AND THEIR CLOSEST LIVING RELATIVES ARE BEARS. THEY ARE CHARACTERIZED BY MODIFICATION OF LIMBS TO FLIPPERS. PINNIPEDS ARE MAMMALS WITH FOUR FLIPPERS — ONE PAIR IN FRONT AND ONE AT THE BACK. THEY ARE WARM-BLOODED, NURSE THEIR YOUNG, BREATHE AIR AND HAVE HAIR. THE SEA LION HAS SMALL, TINY EXTERNAL EAR FLAPS. SEALS HAVE NO FLAPS. THE FRONT FLIPPERS OF SEA LIONS ARE LONG, HAVE NO HAIR AND NAILS. SEALS’ FRONT FLIPPERS ARE SHORT, BLUNT, COVERED WITH HAIR WITH NAILS ON THE ENDS. SEA LIONS CAN TURN THEIR HIND FLIPPERS FORWARD TO MOVE ON LAND BUT SEALS CANNOT DO SO.

Answer: Option B. -> Only 2 & 3
GINGER AND TURMERIC ARE COMMON EXAMPLES OF RHIZOMES. DURING FAVOURABLE CONDITION, AERIAL SHORTS DEVELOP FROM THE TERMINAL BUDS AND ESTABLISH NEW PLANTS, WHICH IN TURN PRODUCE NEW RHIZOMES. RHIZOMES SHOW PERENNATION, THAT IS – THEY LIVE THROUGH THE YEARS.

Answer: Option C. -> Only 1, 2 & 4
ALL OF THE LISTED ORGANS SECRETE DIGESTIVE ENZYMES EXCEPT THE GALL BLADDER. THE GALL BLADDER STORES AND SECRETES BILE PRODUCED BY THE LIVER, WHICH IS AN EMULSIFIER, NOT AN ENZYME. (A), THE MOUTH SECRETES SALIVARY AMYLASE. (B), THE STOMACH SECRETES PEPSIN. (D), THE SMALL INTESTINE SECRETES PROTEASE.

Answer: Option D. -> Mitochondria
MITOCHONDRIA IS THE CORRECT ANSWER.

Answer: Option A. -> 1 & 3 Only
THE DISEASE HAS STILL NOT BEEN OBSERVED IN INDIA. IT IS A FUNGAL DISEASE THAT PERIODICALLY DESTROYS WHEAT CROPS IN SOUTH AMERICA. THE DISEASE WAS FIRST OBSERVED IN BRAZIL IN 1985. THE FIRST ASIAN OUTBREAK OF WHEAT BLAST WAS FOUND IN BANGLADESH IN FEBRUARY 2016.

Answer: Option D. -> 1, 2 & 3
THIS QUESTION CAN BE JUSTIFIED WITH EXAMPLE OF JUST ONE INSECT – COCKROACH, THOUGH THE MILLIONS OF SPECIES OF INSECTS HELP TO SUSTAIN THE DELICATE ECOSYSTEMS. MOST COCKROACHES FEED ON DECAYING ORGANIC MATTER, WHICH TRAPS A LOT OF NITROGEN. THE COCKROACH’S FEEDING HAS THE EFFECT OF RELEASING THAT NITROGEN (IN THEIR FAECES) WHICH THEN GETS INTO THE SOIL AND IS USED BY PLANTS. THE EARTH’S 5,000—10,000 COCKROACH SPECIES ARE ALSO AN IMPORTANT SOURCE OF FOOD FOR MANY BIRDS AND SMALL MAMMALS SUCH AS MICE AND RATS, AND THUS AN IMPORTANT PART OF THE FOOD CYCLE.

Answer: Option C. -> Both 1 & 2
BOTH ARE CORRECT STATEMENTS
BOTH CYANOBACTERIA AND BACTERIA REPRODUCE THROUGH ASEXUAL METHODS. BOTH POSSESS SAPROPHYTIC MODE OF LIFE. BOTH POSSESS THE ABILITY TO FIX NITROGEN. THE MAIN DIFFERENCE BETWEEN THE TWO IS THAT CYANOBACTERIA POSSESS CHLOROPHYLL WHILE MOST BACTERIA DO NOT.

Answer: Option C. -> Only 2
FIRST STATEMENT IS INCORRECT BECAUSE THE DISEASE IS A SOIL BORNE FUNGAL DISEASE. IT INVADES THE BANANA PLANT THROUGH THE ROOTS. IT WAS IN NEWS BECAUSE IT HAS CAUSED SERIOUS DAMAGES TO BANANA CROPS ACROSS KERALA. THIRD STATEMENT IS ALSO INCORRECT BECAUSE THE DISEASE IS NOT CONFINED TO TROPICS.

Answer: Option D. -> It impairs the body’s ability to make blood clots
DOWN SYNDROME MAINLY AFFECTS HEARING, VISION, THE CIRCULATORY SYSTEM AND THE BONE SYSTEMS.