Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false

Assertion : Synthesis of tryptophan is self regulatory.
Reason: Tryptophan works both as co-repressor and through feedback inhibition.

For two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Assertion: In GIFT, fertilisation takes place in vivo.
Reason: The results of GIFT are less better than in vitro fertilisation.

Bt cotton is not:

1. A GM plant.
2. Insect resistant.
3. A bacterial gene expressing system.
4. Resistant to all pesticides.

Transgenic plants are developed by:

1. Introducing foreign genes
2. Introducing gene mutations
3. Deleting certain chromosome parts
4. Stopping spindle formation

Transgenic animals are extensively used for all the following procedures except:

1. Bioremediation
2. Chemical safety
3. Vaccine safety
4. Toxicity test

For two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Assertion: Epididymis is divided into three parts.
Reason: Epididymis is the organ that stores spermatozoa.

For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false

Assertion: Lactose in lac operon is promoter gene.
Reason: Lactose inactivates the repressor gene.

For two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Assertion: Pollen grains of many insect pollinated species are sticky.
Reason: In the anemophilous flower, the pollen grains are powdery and non-sticky.

For two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Assertion: Seminiferous tubule is related with spermatogenesis.
Reason: Spermatogenesis takes place under the influence of pituitary gonadotrophins and testosterone

For question, two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.

1. Both assertion and reason are true, and reason is the correct explanation of assertion.
2. Both assertion and reason are true, but reason is not the correct explanation of assertion.
3. Assertion is true, but reason is false.
4. Both assertion and reason are false.

Assertion : There is no chance of transmission of malaria to man on the bite of a male Anopheles mosquito.

Reason: It carries a non-virulent strain of Plasmodium.