Elephants are not the most common species in African grasslands. The grasslands contain scattered woody plants, but they are kept in check by the uprooting activities of the elephants. Take away the elephants, and the grasslands convert to forests or to shrublands. The newly growing forests support fewer species than the previous grasslands. Which of the following describes why elephants are the keystone species in this scenario?

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#Question id: 68

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following functional groups given in column I with their respective representatives given in column II.

COLUMN I               COLUMN II

1. Anhydride               a. RCOOR

2. Ether                       b. ROCOCH3

3. Acetyl                     c. ROR

4. Amido                     d. RCOOCOR

5. Ester                        e. RCONH2

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#Question id: 7289

#Unit 1. Molecules and their Interaction Relevant to Biology

The following scheme shows the flowering status of a plant species and the photoperiodism. Which of the following conclusions is most appropriate?

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#Question id: 15690

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect statement for the matrix 

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#Question id: 27394

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following has smallest size

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#Question id: 27393

#Unit 1. Molecules and their Interaction Relevant to Biology

In an exothermic reaction………a…….. and in endothermic reaction …………b………

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#Question id: 27392

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following

Bond	Bond energy in KJ
I. C=C	a. 891
II. C ≡ O	b. 946
III. N≡N	c. 1080
IV. C≡N	d. 611