our environment Science - our environment

• A
  Parasite$-$Consumers which obtain liquid food nutrients from host organisms.
• B
  Agro$-$ecosystem$-$A man$-$made ecosystem
• C
  $UV$ radiation$-$Causes skin cancer in human beings.
• ✓
  Ecosystem$-$Physical components of environment.

Answer: D.

• A
  All consumers are not producers.
• B
  More energy is available at lower trophic levels.
• C
  One organism may be involved in more than one food chain.
• ✓
  All of the given

Answer: D.

• A
  $X$ and $Y$ both correct.
• B
  $X$ and $Y$ both incorrect.
• C
  $X$ correct and $Y$ incorrect.
• ✓
  $X$ incorrect and $Y$ correct.

Answer: D.

• ✓
  Less availability of energy at higher tropic level
• B
  Sufficient food supply
• C
  Polluted air
• D
  Water

Answer: A.

• A
  $3$
• B
  $4$
• C
  $1$ and $3$
• ✓
  $2$ and $3$

Answer: D.