Ecosystems — BIOLOGY STD 12 Science — Question

Cannabinoids affect the digestive system. [True/ False]

Write the two uses of PCR technique in diagnosis.

State whether the following are true or false:
The pyramid of energy is always inverted. It can never be upright.

MTPs are considered relatively safe during the first 18 weeks of pregnancy.

The cloning vector pBR 322 has three antibiotic-resistance genes. (True/ False)

State True/ False with explanation.
Creating awareness about sex related aspects is an effective method to improve reproductive health of the people. (True/ False)

Which of the following principle is associated with the ethics of animal use in genetic engineering?

1. Reduction of animal use
2. Refinement of husbandry
3. Replacement of animal with non-animal alternatives
4. All of the above

Organisms living in water bodies (lake, sea, river) do not face any water related problems. [True/ False]

Hepatitis-B, AIDS and genital herpes are the STDs that can be cured.

Ladybird beetle and mycorrhizae control many insect pests.