Plant Growth and Mineral Nutrition — BIOLOGY STD 12 Science — Question

Explain modern Synthetic Theory of Evolution in brief.

Sunny was rushed to a nearby hospital after an accident, which had caused too much blood loss. The hospital failed to supply 'O' negative blood for transfusion. Ahmed, who was attending a patient there, heard about the situation and agreed to donate blood as he had the same blood group. Sunny's mother initially refused but was later convinced by her daughter's view.

1. Why cannot 'O' positive blood be transfused into Sunny's body?
2. What is the genetic basis of blood group inheritance?
3. Human blood grouping is an example of?
4. What values do you find in Sunny's sister and Ahmed?

Replication was allowed to take place in the presence of radioactive deoxynucleotides precursors in E.coli that was a mutant for DNA ligase. Newly synthesised radioactive DNA was purified and strands were separated by denaturation. These were centrifuged using density gradient centrifugation. Which of the following would be a correct result?

What role does pituitary gonadotropins play during follicular and ovulatory phases of menstrual cycle? Explain the shifts in steroidal secretions.

Observe the given diagram and answer the questions based on it.(a) Which apparatus is shown in the given diagram ?
(b) What is the function of this apparatus?
(c) What are the reactions that can take place in blocks 1, 2, and 3?

Give few examples of biofortified crops. What benefits do they offer to the society?

What is apomixis? Explain the categories of apomixis.

Proliferative Phase and Secretory Phase.

Define ecological pyramids and describe with examples, pyramids of number and biomass.