Which two of the following changes (A to D) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?
A) Increase in red blood cell size
B) Increase in red blood cell production
C) Increased breathing rate
D) Increase in thrombocyte count

Study the four statements (A to D) given below and select the two correct ones out of them.
A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.
B) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates.
C) Predators ultimately lead to the extinction of prey species.
D) Production of chemicals such as nicotine, strychnine by the plants is disordered.
The two correct statements are

Which one of the following is most appropriately defined?

Diapause is a type of response classified under_______.

1000 fish in the volume of water in the pond indicates _____________________

Nuts are eaten by birds and squirrels. This is an example of an interaction called _____________

Birds sitting on cows to eat insects is an example of ____________

Animals destroyed at the feet of elephants is an example of ____________

Type of response in hibernation and aestivation.

Identify the response under which 'Osmotic balance' can be classified.

Which of the following is a behavioural adaptation?

"Birds and mammals attain greater body size in colder regions than warmer regions." - Choose the correct option.

Van't Hoffs rule describes the impact of ____________ on the environment.

The word 'niche' was first used by __________

What type of human population is represented by the following age pyramid?