Organisms and Populations · Question 60

Consider the following four conditions (a – d) and select the correct pair of them as adaptation to environment in desert lizards. The conditions : (a) burrowing in soil to escape high temperature (b) losing heat rapidly from the body during high temperature (c) bask in sun when temperature is low (d) insulating body due to thick fatty dermis

1. (c), (d)
2. (b), (d)
3. (a), (c)
4. (a), (b)

Which one of the following is categorised as a parasite in true sense?

1. The female Anopheles bites and sucks blood from humans
2. Head louse living on the human scalp as well as laying eggs on human hair
3. The cuckoo (koel) lays its eggs in crow's nest
4. Human foetus developing inside the uterus draws nourishment from the mother

Which one of the following is most appropriately defined?

1. Parasite is an organism which always lives inside the body of other organism and may kill it.
2. Host is an organism which provides food to another organism.
3. Amensalism is a relationship in which one species is benefited whereas the other is unaffected
4. Predator is an organism that catches and kills other organism for food.

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do a, b and c represent respectively – [figure]

1. (a) partial regulator, (b) regulator, (c) conformer
2. (a) conformer, (b) regulator, (c) partial regulator
3. (a) regulator, (b) conformer, (c) partial regulator
4. (a) regulator, (b) partial regulator, (c) conformer

Study the four statements (a–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 are metabolic disorders The two correct statements are –

1. b and c
2. a and d
3. c and d
4. a and b

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them : [figure]

1. "A" is more recent and shows slight reduction in the growth rate
2. "B" is more recent showing that population is very young
3. "A" is the earlier pyramid and no change has occurred in the growth rate
4. "B" is the earlier pyramid and shows stabilized growth rate

Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :

1. Xerophytes
2. Epiphytes
3. Hydrophytes
4. Mesophytes

Consider the following four statements (i)–(iv) about certain desert animals such as kangaroo-rat. (i) They have dark colour and high rate of reproduction and excrete solid urine (ii) They do not drink water, breathe at a slow rate to conserve water and have their body covered with thick hairs (iii) They feed on dry seeds and do not require drinking water (iv) They excrete very concentrated urine and do not use water to regulate body temperature Out of these four, which two are correct?

1. (i) and (ii)
2. (ii) and (iii)
3. (iii) and (i)
4. (iii) and (iv)

Quercus species are the dominant component in:

1. Temperate deciduous forests
2. Alpine forests
3. Scrub forests
4. Tropical rain forests

Geometric representation of age structure is a characteristic of :-

1. Biotic community
2. Landscape
3. Ecosystem
4. Population