Correct Answer:
(C) Formic acid
The acid produced by ants is called formic acid. Chemically it is a simple carboxylic acid. When ants bite, they inject this acid.
Ques: 2
Consider the following statements about mosquitoes:
Only males suck blood
Only females suck blood
Females suck plant juices
Males have bigger wings than females
Females have bigger wings than males of these:
Options:
Correct Answer:
(D)
Only 2 and 5 are correct.
Only female mosquitoes suck the blood of warm-blooded vertebrate birds and mammals and live on them as an ectoparasite. The male mosquitoes do not suck blood, they survive by feeding on flowers and fruit juices. Occasionally, females may also suck juices. Generally, female mosquitoes are larger than male mosquitoes. That is why option (d) is the correct answer.
Ques: 3
In which one of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?
Correct Answer:
(C) Spider
Spider cannibalism is the act of a spider consuming all or part of another individual of the same species as food. In the majority of cases, a female spider kills and eats a male spider before, during or after copulation. But the strong male spider escapes and again copulate.
Ques: 4
King Cobra is the only snake that makes its own nest. Why does it make its nest?
Correct Answer:
(C) It is an oviparous snake and lays its eggs in the nest and guards the nest until they are hatched
The king cobra is unusual among snakes in such a way that the female king cobra is a very dedicated parent. She makes a nest for her eggs, scraping up leaves and other debris into a mound in which to deposit them and remains in the nest until the young hatch. A female usually deposits 20 to 40 eggs into the mound, which acts as an incubator.
Ques: 5
Consider the following statements:
Some species of turtles are herbivores.
Some species of fish are herbivores.
Some species of marine mammals are herbivores.
Some species of snakes are viviparous.
Which of the statements given above are correct?
Correct Answer:
(D)
1, 2, 3 and 4
When green sea turtle (Chelonia mydas) becomes adult it becomes strictly herbivores. Many species of fish are herbivores, like parrot fish which eats algae. Some marine mammals like dugong are herbivores. Some species of snakes like green anaconda are viviparous means they give birth live young ones rather than laying eggs like other reptiles. Hence, option (d) is the correct answer.
Ques: 6
Which one of the following is not correctly matched?
Correct Answer:
(D)
Nepenthes - Parasitic angiosperm
Pitcher plants or Nepenthes are able to synthesize their food by the process of photosynthesis, hence they are autotrophs. Usually, they grow on soils deficient in nitrogenous compounds and fulfill their required nitrogen by digesting insects. Other options are correctly matched.