Tag: biology

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Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

The table below gives the populations (in thousands) of ten species (A-J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows :-










































































































































Area and Number of habitats Species and their populations (in thousands) in the areas
A B
a (11) 2.3
b (11) 10.2
c (13) 11.3
d (14) 3.2





Which area out of a tod shows maximum species diversity?

  1. d

  2. a

  3. b

  4. c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Species diversity is the number of different species that are represented in a given community. The two main factors taken into account when measuring diversity are richness and evenness. The habitats c and d have a higher species richness as compared to habitat a and b as both of them have 10 different types of species, while a and b have 8 and 7 different types of species respectively. However, habitat d has more species evenness as compared to habitat c. Since, the species diversity depends both on the species richness and the species evenness, so species d has a higher species diversity as compared to species c. So, the correct option is 'd'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Waking up to a bulbul's song in the morning is related to 

  1. narrow utilitarian

  2. broadly utilitarian

  3. ethical

  4. both (b) and (c).
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The broadly utilitarian argument says that biodiversity plays a major role in many ecosystem services that nature provides. The fast dwindling Amazon forest is estimated to produce, through photosynthesis, 20 percent of the total oxygen in the earth’s atmosphere. Pollination (without which plants cannot give us fruits or seeds) is another service, ecosystems provide through pollinators layer – bees, bumblebees, birds and bats. There are other intangible benefits – that we derive from nature–the aesthetic pleasures of walking through thick woods, watching spring flowers in full bloom or waking up to a bulbul’s song in the morning.
So the correct option is 'broadly utilitarian'.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Animals exposed to bright light have

  1. Darker pigmentation

  2. Lighter pigmentation

  3. Tint of yellow and red colours

  4. Both A and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gloger's rule suggests that animals living in environments with higher light intensity or humidity often exhibit lighter pigmentation to reflect radiation or for camouflage.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Altruistic behaviours between closely related animals are selected for because they

  1. Reduce fighting between species

  2. Ensure survival of the altruistic individual

  3. Force individuals to cooperate with one another and so increase population growth

  4. Increase the frequency of the altruistic individuals genes in the next generation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An organism is said to behave altruistically when its behaviour benefits other organisms, at a cost to itself. The costs and benefits are measured in terms of reproductive fitness, or expected number of offspring. So by behaving altruistically, an organism reduces the number of offspring it is likely to produce itself, but boosts the number that other organisms are likely to produce. 

So the correct option is 'ensure survival of the altruistic individual'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

By and large animals belonging to different species don't mate together, but occasionally animals of different species can mate in captivity. Which two animals are known to mate together in captivity?

  1. Chimpanzee and gorillas

  2. Camels and giraffes

  3. Cats and dogs

  4. Lions and tigers
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A liger is a result of breeding a male lion to a tigress. A tigon is a result of breeding a male tiger to a lioness. Since lions and tigers do not exist in the same areas, this is not something that happens in the wild.

So, the correct option is 'Lions and tigers'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

_______ are modified to form tendrlis in cucumber. 

  1. Terminal buds

  2. Axillary buds

  3. Thorns

  4. More than one option correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tendrils is a modification in cucumber that helps the plant to climb higher and higher. These are skinny, wire-like structures along the plants stem. It also helps in grasping in cucumber. These tendrils are the modification of axillary buds located at the axial part of the leaf.

So, the correct option is 'Axillary buds'.

Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Select the incorrect match.

Taxon Category
$(1)$ Insect Class
$(2)$ Tiger Species
$(3)$ Crucifers Family
$(4)$ Orchid Order

  1. A

  2. B

  3. C

  4. D
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The orchid family (Orchidaceae) is subdivided into 5 subfamilies, 22 tribes and 70 subtribes and 850 genera are informal as alliances.

So, the correct option is 'D'.