Assertion : Persons suffering from haemophilia fail to produce blood clotting factor VIII.
Reason : Prothrombin producing platelets in such persons are found in very low concentration
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Assertion : Mitochondria and chloroplasts are semi-autonomous organelles.
Reason : They are formed by division of pre-existing organelles as well as contain DNA but lack protein synthesizing machinery.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Assertion : The fungi are widespread in distribution and they even live on or inside other plants and animals.
Reason : Fungi are able to grow anywhere on land, water or on other organisms because they have a variety of pigments, including chlorophyll, carotenoids, fucooxanthin and phycoerythrin.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Assertion : C4 photosynthetic pathway is more efficient than the C3 pathway.
Reason : Photorespiration is suppressed in C4 plants.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
A.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
C4 photosynthetic pathway is more efficient than C3 pathway as C4 plants can pick up CO2 even when it is found in low concentration. PEP enzymes shows high affinity for CO2. C4 plants contain two types of chloroplast : bundle sheath chloroplast and mesophyll chloroplast. Bundle sheath cells contain Calvin cycle enzymes. Due to high concentration of CO2 in bundle sheath cells, RuBP carboxylase works only for Calvin cycle and not for photorespiration.
Photorespiration works to undo the act of photosynthesis in C3 plants. No energy rich compound is produced in this process. When temperature increase more and more photosynthetically fixed carbon is lost by photorespiration, thus reducing the efficiency of C3 plants.
Assertion : The atmospheric concentration of CO2 at which photosynthesis just compensates for respiration is referred to as CO2 compensation point.
Reason : The CO2 compensation point is reached when the amount of CO2 uptake is less than that generated through respiration because the level of CO, in the atmosphere is more than that required for achieving CO2 compensation point.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Assertion : The duck-billed Platypus and the spiny ant-eater, both are egg-laying animals yet they are grouped under mammals.
Reason : Both of them have seven cervical vertebrae and 12 pairs of cranial nerves.
If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
If both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
If Assertion is true but Reason is false
If both Assertion and Reason are false
Given below is a pedigree chart showing the inheritance ofa certain sex-linked trait in humans
The trait traced in the above pedigree chart is
dominant X- linked
recessive X- linked
dominant Y- linked
recessive Y- linked
A cross section at the midpoint of the middle piece of a human sperm will show
centriole, mitochondria and 9 + 2 arrangement of microtubules
centriole and mitochondria
mitochondria and 9 + 2 arrangement of microtubules
9 + 2 arrangement of microtubules only
Which one of the following is a correct statement?
"Bt" in "Bt-cotton" indicates that it is a genetically modified organism produced through biotechnology
Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
The anticoagulant hirudin is being produced from transgenic Brassica napus seeds.
"Flavr Savr" variety of tomato has enhanced the production of ethylene which improves its taste.
An insect bite may result in inflammation of that spot. This is triggered by the alarm chemicals such as
histamine and dopamine
histamine and kinins
interferons and opsonin
interferons and histones