Observe the food chain: Plant (1000 kj) → Goat → Lion (a) If autotrophs occupying the first trophic level are called producers, what are herbivores called as? (b) How much energy does the lion get in the above food chain?

What is reproduction? Mention the importance of DNA copying in reproduction.

Updated 1/12/2026

Name the male and female gametes in animals. What is fertilization and where does it take place in human females?

Updated 1/12/2026

• What are chromosomes? Where are they seated? • What is a sex chromosome? • Explain the mechanism of sex determination in human beings.

Updated 1/12/2026

(a) In human body what is the role of • seminal vesicles and • prostate gland. (b) List two functions performed by testes in human beings.

Updated 1/12/2026

“The sex of the children are determined by what they inherit from their father and not the mother.” Justify.

Updated 1/12/2026