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Given below are two statements:
Statement I: Down's syndrome is caused by the absence of one of the X-chromosomes.
Statement II: Turner's syndrome is caused by the presence of an additional copy of the chromosomes.
In the light of the above statements, choose the correct answer from the options given below:

Which of the following statements are Correct?
(a) Energy flow from producers to consumers is unidirectional
(b) Energy pyramid can never be inverted
(c) Transfer of energy follows the 1% law
Choose the correct answer from the options given below :

Natural selection can lead to
(a) stabilisation
(b) genetic drift
(c) directional change
(d) disruption
Choose the correct answer from the options given below :

If the diploid chromosome number of typical angiosperm is 36, what would be the chromosome number in its endosperm?

Match List-I with List-II.
List-I:
A. Both species are harmed
B. One species is harmed and the other is benefited
C. Both species are benefited
D. One is benefited while the other has no effect
List-II:
I. Predation
II. Mutualism
III. Competition
IV. Commensalism
Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The logistic growth model of populations is considered more realistic than the exponential growth model.
Reason R: Resources are finite.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following statements about the reabsorption process in Henle's loop are correct?
(a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes.
(b) Urine gets concentrated in Henle's loop.
(c) Reabsorption of $Na^{+}$ and water takes place in Henle's loop.
(d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop.
Choose the correct answer from the options given below:

Which of the following statements is correct about Plasmodium?

Muscle contraction is initiated by a signal sent by the central nervous system by the release of

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Forelimbs of human and bats are homologous.
Reason R: Forelimbs of humans and bats have similar anatomical structure.
In the light of the above statements, choose the most appropriate answer from the options given below.

Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is

A population of diploid organisms is at Hardy-Weinberg equilibrium. If the frequency of allele A is 0.1, the frequency of AA is

Which of the following statements about lac-operon is correct?

Which of the following in female gametophyte of an angiosperm helps in guiding the pollen tube for fertilizing the eggs?

The inactive form of Bt toxin is converted to the active form in the insect gut

Which of the following is not evidence for evolution?

Given below are two statements:
Statement I: Ovulation is caused by LH surge leading to rupture of Graafian follicles.
Statement II: Graafian follicle remaining after ovulation transform into corpus luteum and secretes large amount of estrogen.
In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced.
Reason R: Goats were more efficient at browsing than Abingdon tortoise.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is used as an effective sedative and painkiller for treating post-surgery patients?

For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?