Enhancement of Food Production — BIOLOGY STD 12 Science — Question

Give the adverse effects of opioids, cannabinoids and morphine on human health.

Excessive and continuous use of pesticides has resulted in evolution of some new species of pests. Explain what must have led to this. What is this type of evolution called?
OR
Anthropogenic action can hasten evolution. Explain with the help of a suitable example.

On a visit to a Hill station, one of your friend suddenly became unwell and felt uneasy.

1. List two symptoms you would look for to term it to be due to allergy.
2. Explain the response of the body to an allergen.
3. Name two drugs that can be recommended for immediate relief.

A woman has certain queries as listed below, before starting with contraceptive pills. Answer them.
What do contraceptive pills contain and how do they act as contraceptives?

Delhi Municipality has started the concept of keeping two dustbins of two different colours (green and blue) in many places, for waste disposal.

1. What is the significance of this practice?
2. Differentiate between the two types of wastes we produce. Which of them is more harmful and must be reduced significantly?
3. What value can be learnt from this arrangement?

Explain as to how protection of biodiversity hot spots alone can reduce up to 30% of the current rate of species extinction.

Indicate the stages where meiosis and mitosis occur (1, 2 or 3) in the flow chart,

What are bioherbicides? Give any two examples.

Why is it difficult for DNA to pass through cell membranes? How can E.coli cells be made competent and who developed this method?

How do organisms like fungi, zooplanktons and bears overcome the temporary short-lived climatic stressful conditions? Explain.