Organisms and Populations — BIOLOGY STD 12 Science — Question

Golden rice is:

1. A transgenic rice having gene for - carotene.
2. Wild variety of rice with yellow coloured grains.
3. Long stored rice having yellow colour tint.
4. A variety of rice grown along the yellow river in China.

Which among the following is true for BT toxin?

1. It kills the lepidopterans.
2. It is coded by 'cry' gene.
3. It exists in bacteria as prototoxin.
4. All are true.

Write name of two hotspot or biodiversity rich areas of India.

Give an example of a plant, where the F, progeny of a monohybrid cross has the same genotypic and phenotypic ratios.

Write the sex of a human having XXX sex chromosomes along with 22 pairs of autosomes. Name the disorder this human suffers from.

How is an ovule technically referred to?

Write the probable differences in eating habits of Homo habilis and Homo erectus.

Directions: In the following questions, the Assertions (A) and Reason(s) (R) have been put forward. Read both the statements carefully and choose the correct alternative from the following:
Assertion: PCR can detect very low amounts of DNA and is now routinely used to defect HIV in suspected AIDS patient.
Reason: PCR is a powerful technique to identify many other genetic disorders.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Name the last of the human chromosome to be sequenced.

Expand PAR.