Biotechnology and its Applications — BIOLOGY STD 12 Science — Question

Human insulin is being commercially produced from transgenic species of _____________:

1. E. coli
2. Brassica napus
3. Bacillus thuringiensis
4. Agrobacterium

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 are 36 biodiversity hotspots in the world.
Reason: High level of species richness is a criteria for selection of a biodiversity hotspot.

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: Indiscriminate exploitation ofeconomically important wild plants may lead to their extinction.
Reason: Non-conservation of their germplasm is responsible for this.

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: B-DNA has a constant diameter of 20 A.
Reason: A pyrimidine always pairs with a purine.

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: Subcutaneous implants (Norplants) involve implantation of synthetic progesterone under the skin.
Reason: Norplants block ovulation and thickens the cervical mucus to prevent sperm transport.

Transgenic plants are developed by:

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

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: At the time of implantation, which takes place in 14 days, the human embryo is called blastocyst.
Reason: Implantation occurs in the gastrula stage.

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: Generally the intraspecific competition is more intense than interspecific competition.
Reason: lntraspecific competition occurs when the resources are in short supply.

Assertion (A): Decomposition process is slower if detritus is rich in lignin and cutin.
Reason (R): Decomposition is largely an oxygen requiring process.

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: Many plants growing in oli gotroph ic soi Is possess mycorrhizae.
Reason: Mycorrhizae help in efficient absorption of nutrients.