Variations caused by mutation, as proposed by Hugo de Vries, are:

1.	small and directionless	2.	random and directional
3.	random and directionless	4.	small and directional

How does steroid hormone influence the cellular activities?

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F₁ generation, pink flowers were obtained. When pink flowers were selfed, the F₂ generation showed white, red, and pink flowers. Choose the incorrect statement from the following:

Placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is:

1. Free central

2. basal

3. Axile

4. Parietal

Select the correct group of biocontrol agents:

1. Nostoc, Azospirillum, Nucleopolyhedrovirus

2. Bacillus thuringiensis. Tobacco mosaic virus, Aphids

3. Trichoderma, Baculovirus, Bacillus thuringiensis

4. Oscilatoria, Rhizobium, Trichoderma

The correct sequence of phases in cell cycle is:

1. ${\mathrm{G}}_1\to \mathrm{S}\to {\mathrm{G}}_2\to \mathrm{M}$

2. $\mathrm{M}\to {\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{S}$

3. ${\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{S}\to \mathrm{M}$

4. $\mathrm{S}\to {\mathrm{G}}_1\to {\mathrm{G}}_2\to \mathrm{M}$

Which part of the brain is responsible for thermoregulation?

1. Medulla oblongata

2. Cerebrum

3. Hypothalamus

4. Corpus callosum

Which one of the following is not a method of in situ conservation of biodiversity?

1. Sacred Grove

2. Biosphere Reserve

3. Wildlife Sanctuary

4. Botanical Garden

Which of the following pairs of gases is mainly responsible for green house effect?

1. Carbon dioxide and methane

2. Ozone and Ammonia

3. Oxygen and Nitrogen

4. Nitrogen and Sulphur dioxide

Persistent nucellus in the seed is known as: