(i) To sustain animal visits, flowers have to provide rewards. Name two such floral rewards for the insect pollinators. |
(ii) Which type of floral reward is provided by Amorphophallus to its pollinator? |
Why all hydrophytes are not pollinated by water? |
Or |
Name any two hormones and their source organs which are produced only during pregnancy. |
(i) Can you enumerate the points that principal must have told about to the parents that their children will not get the infection? |
(ii) What values are shown by the principal? |
(i) Is the trait recessive or dominant? |
(ii) Is the trait sex - linked or autosomal? |
(iii) Give the genotype of the parents. |
(i) Mention the types or method of diagnosis a person can undergo in order to detect cancer. |
(ii) What values are shown by Akshay's father? |
(i) What is ART? |
(ii) Identify the values which Amit showed. |
(i) Eradication of insects pest is not recommended by organic farmers. Explain by giving reasons. |
(ii) How do ladybird beetles and dragonflies act as biocontrol agents? |
How adaptation is helpful in the survival of Antarctic fish (Trematomus) which can remain active even in extremely cold sea water. |
Or |
How does coextinction cause loss of biodiversity? Explain by giving an example, write other three factors of evil quartet which cause biodiversity loss. |
Enumerate some major effects of air pollution on plants as well as on animals and humans. |
Or |
Explain any two ways of 'improper resource utilisation' that can cause degradation of natural resources. |
(i) 'The coevolution of the flower and its pollinator species is linked with one another.? Comment. |
(ii) What are the different categories of flowers pollinated by animals? |
Or |
Describe the functions of the following |
(i) Epididymis |
(ii) Vas deferens |
(iii) Seminiferous tubules |
(iv) Vagina |
(v) Trophoblast |
Living beings exhibit a large degree of similarity in chemical constitution, biochemical reactions and body functions. They provide a number of evidences of common ancestry and evolution of different groups of organisms. Discuss in detail. |
Or |
Study the schematic representation of the genes involved in the lac operon given below and answer the questions that follow. |
(i) Identify and name the regulatory gene in this operon. Explain its role in switching off the operon. |
(ii) Why lac operon is called an inducible operon system? |
(iii) Name the inducer molecule and the products of the genes 'z' and 'y' of the operon. Write the function of these gene products. |
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